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  #21  
Old 01-04-2017, 12:57 PM
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270 weatherby mag.


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Quote:
Originally Posted by WBY Shooter View Post
I just picked up a new 270 WBY Mag. I tried the 130 gr SELECT factory ammo with outstanding results. So I know the gun and scope ( Leupold VX-6) can shoot good groups. I have tried several hand loads with disappointing results.
IMR 4350, 68gr, Nosler Ballistic tip
H4831 72gr Nosler Ballistic tip
Any suggestions?
270 wby mag 130 grain pointed soft point boat tail speer imr 4350 67g 3247fps and federal 215 magnum primers. this is an accuracy load. lyman 45th edition.works good for me but do not load in old brass new brass only then your gun will be right on
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  #22  
Old 01-04-2017, 01:30 PM
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First off, I run a 270 Weatherby, it is very accurate, even with the freebore at .375".

You have not worked up an accuracy load, this is your first mistake. You can't choose a powder weight and expect it to perform like factory ammo, it simply doesn't happen 99% of the time.

If it were me, I would be starting with H1000, RE25/26, Retumbo or Magnum. These powders tend to give the highest velocities AND best accuracy.
Your 1:10" twist is fine for all bullet weights, there is no accuracy issues with that twist rate.
Some rifles just don't like particular bullet weights, but this is most likely not the case in your rifle because you have not done ANY work up. I work up from 5% below max with 3 rounds per charge weight and 1gr intervals, shoot groups and choose the load that produces the tightest group.
I find tuning a Weatherby cartridge a waste of time, just seat bullets to be within the magazine length and shoot.

Hope this helps.

Cheers.
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  #23  
Old 01-04-2017, 01:50 PM
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Case shoulder cave in 257 Weatherby

Quote:
A too long COL causes problems.
Case shoulder cave in - The Firing Line Forums

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Last edited by 243winxb; 01-07-2017 at 03:07 PM. Reason: small photo link, same as below. Add quote for post 24
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  #24  
Old 01-04-2017, 03:00 PM
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[QUOTE=243winxb;1448018]Case shoulder cave in - The Firing Line Forums



I don't see the point of your thread and inference to collapsed shoulders?

I built a 25 Pronghorn (25-300WSM) some years back, it would collapse shoulders with H4831sc, the ONLY powder that didn't have ANY issues was RE25. The window that other powders worked in was very small and a catastrophic failure was very likely with several powders, this is why I abandoned that project. The barrel sits gathering dust these days.

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Last edited by MagnumManiac; 01-06-2017 at 10:58 PM. Reason: picture removal
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  #25  
Old 01-04-2017, 03:26 PM
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Magnum Maniac you may recall a short time ago, I was trying to buils a 25RSAUM ? Anyway the info gathered from you about your 25Pronghorm and others killed that project . Since that time I've talked with others who have tried both the WSM & RSAUM cases for 25cal wildcats, and they report the same experiences with certain powders. some have only added 2 tenths of a grain more and blown primers and collapsed shoulders. There is another forum where guys are building 25Ultra Mags and they're reporting phenominal velocity and nothing has behaved with erratic pressures. I think it's just a matter of time before one comes unglued...now that would be catastrophic !
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  #26  
Old 01-04-2017, 06:48 PM
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Go for the heavier bullets for caliber. Look at VLD bullets with a high ballistics coefficient and sectional density. Ensure your rifling twist will support the longer bullet. Then choose a powder that gives the highest velocity for that bullet and load at about 90% loading density. If two powders are close, choose the one with the lower chamber pressure. It'll be easier on your rig and provide a little wiggle room. That won't immediately solve the problems but will get you in the ballpark.
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  #27  
Old 01-04-2017, 07:01 PM
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Elkhamr, thanks for the input.
The first 20 rounds though this new WBY were factory loads at 3280 fps. Per the manual the hand loads were very close to that. Shot 20 shots with hand loads. 10 each of 2 different loads. I did a good cleaning but have not had the opportunity to shoot again. Could the first 20 shots have fouled the barrel enough to cause an accuracy problem?
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  #28  
Old 01-05-2017, 02:47 AM
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Quote:
Originally Posted by WBY Shooter View Post
Elkhamr, thanks for the input.
The first 20 rounds though this new WBY were factory loads at 3280 fps. Per the manual the hand loads were very close to that. Shot 20 shots with hand loads. 10 each of 2 different loads. I did a good cleaning but have not had the opportunity to shoot again. Could the first 20 shots have fouled the barrel enough to cause an accuracy problem?
(MagnumManiac - can you delete the above picture from the thread, or cut the size down a bit? Makes it really hard to read, as we now have to scroll side-to-side.)

Since there is no way to know what powder was used to drive the factory loads at 3,280fps, there is little point in trying to match that with hand loads. The process for working up a hand load does NOT include chronographing a factory load and then picking the charge weight, from a manual, that "should" approximate that velocity!

Creating accurate handloads, for a belted magnum cartridge, goes something like this: Fire-form the brass to your chamber and then neck-size the resulting case. At this stage (case prep) there are many little things you can do to help improve the accuracy that will result from loaded rounds. You can trim every case to a specific length, uniform the primer pocket, deburr the flash hole, sort cases by weight, check for concentricity, turn case necks, etc, etc, etc. Once your cases are prepped (which is the real key to successful reloading of accurate ammunition), you can move on to the loading of components.

Pick a very good bullet, and a powder that is on the slow side of suitable for your cartridge. This combination is very likely to result in at least one accurate load, at some point in the range of safe charge weights. Either choose a powder that meters well, or commit to trickling each charge in your test cartridges to ensure they are consistent. START LOW AND WORK YOUR WAY UP! Don't just pick a charge weight or two and head to the range. You'll likely find two accuracy nodes within the range of powder charges; one on the slower side and another within a grain or two of MAX. Be happy with the accuracy and don't sweat it if the chronograph says these are 150fps slower than the factory load. From the results you get during the first round of shooting, pick one or two charge weights that showed a lot of promise and load up 10-20 more of those, shooting them to confirm what you saw the first time around.

Now that you have a very accurate load for your rifle, learn what that load does at 200, 300, 400 yards or more, if you intend to hunt or shoot regularly at those distances. Don't rely on a drop chart; make one from the results you actually see on the range. Get so comfortable with that load, in your rifle, that you know what it's capable of doing, under field conditions. That's the real value of reloading.
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  #29  
Old 01-05-2017, 04:23 AM
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Several things about Weatherby cartridges. Almost all dies size them too much and when pulling the expander it bends the rounded shoulders. That will give you run out. I cured it by sending my Redding dies along with fired brass back to Redding to get lapped for minimum sizing. It worked. I was 1/2 minute from 100 to 600 yards. Actually head shot a chuck at 550 yards.
Next, do NOT load long, make sure you use the whole neck on bullets. If a primer bumps out a bullet first you can get an SEE event. The freebore will not harm accuracy. Never try to get closer to the rifling.
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  #30  
Old 01-05-2017, 04:24 AM
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Quote:
Originally Posted by WBY Shooter View Post
Elkhamr, thanks for the input.
The first 20 rounds though this new WBY were factory loads at 3280 fps. Per the manual the hand loads were very close to that. Shot 20 shots with hand loads. 10 each of 2 different loads. I did a good cleaning but have not had the opportunity to shoot again. Could the first 20 shots have fouled the barrel enough to cause an accuracy problem?
I not shooting factory 270Wby and one problem with factory is #3-26" barrel.

It's pretty light and heats fast so working up load does take some time.
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  #31  
Old 01-05-2017, 09:12 AM
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The simple answer about fouling a barrel is yes, 20 rounds down a brand new barrel especially at high velocity can severly foul a typical mass produced factory barrel. Now you gave a velocity of 3280fps, was that measured by you with a chronograph, or are you going off the box the factory rounds came in ? This is important to know especially when you're trying to pick a starting point from a reloading manual. You have been given safe, sound methods to find a starting point, and case preparation methods by other very knowledgable riflemen/handloaders. Ok now, so when you cleaned the powder fouling out, did you closely inspect the muzzle end to see if there was copper present ? Did you look closely enough to see tooling marks on the top of the lands? If there are tooling marks that make the top of the lands look like rungs on a ladder, then it's just like shooting across a file and it's going to leave copper deposited because of the rough surface, heat and friction. I owned 1 gen. 2 vangaurd and worked on load developement on another gen. 2 and both barrels severly fouled in the first 3-5 shots. So this is why I'm asking the questions I am.
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  #32  
Old 01-07-2017, 07:07 AM
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Quote:
Originally Posted by WBY Shooter View Post
I just picked up a new 270 WBY Mag. I tried the 130 gr SELECT factory ammo with outstanding results. So I know the gun and scope ( Leupold VX-6) can shoot good groups. I have tried several hand loads with disappointing results.
IMR 4350, 68gr, Nosler Ballistic tip
H4831 72gr Nosler Ballistic tip
Any suggestions?
Assuming you are handloading and since you didn't include bullet weights I will assume 130 gr as in your original good grouping load. Ditch the ballistic tips. There was a discovery not too long ago that the composite tip on those bullets was deforming in the high heat caused by the higher velocity of the magnum cartridges. Deforming the tips, degrading accuracy.

Throw some Nosler Partitions on top of those rounds and I suspect that you'll see those groups tighten back up again.

Eventually technology will catch up to the problem. But for now I keep all the plastic tipped bullets well under 3000 fps. I had an accuracy drop off with a regular .270 Win load that was pretty hot. Put Partitions on top and it shot like a dream.
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  #33  
Old 01-07-2017, 04:57 PM
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Quote:
Originally Posted by emp1952 View Post
Assuming you are handloading and since you didn't include bullet weights I will assume 130 gr as in your original good grouping load. Ditch the ballistic tips. There was a discovery not too long ago that the composite tip on those bullets was deforming in the high heat caused by the higher velocity of the magnum cartridges. Deforming the tips, degrading accuracy.

Throw some Nosler Partitions on top of those rounds and I suspect that you'll see those groups tighten back up again.

Eventually technology will catch up to the problem. But for now I keep all the plastic tipped bullets well under 3000 fps. I had an accuracy drop off with a regular .270 Win load that was pretty hot. Put Partitions on top and it shot like a dream.

Weatherby load BT in his factory ammo for the 270Wby.

Weatherby | 270 Weatherby Magnum
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  #34  
Old 01-08-2017, 01:53 PM
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Quote:
Originally Posted by 243winxb View Post
A too long COL causes problems.
This right here hits the nail on the head with barrels that have lots of free bore, or in the case of Weatherby's lots of deliberately induced free bore which is as an accuracy function by design. Therefore I would do as mentioned by another poster, use the entire neck. Not only should this improve accuracy, but it will also improve velocity.

I would also avoid the light weight bullets with this cartridge. With this cartridge and barrel I would be shooting 150's.

SMOA
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  #35  
Old 01-09-2017, 07:02 AM
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Well I have a few WBY rifles myself. This is just my 2 cents worth on the subject. I have a 300 WBY Mag. I spent a lot of money on reloads trying to shoot a good group. I was just about ready to sell the gun until I decided that I am going to get this gun to shoot. It took a long time to find a load. Finally I found some bullets the gun liked. One of my best groups ever with my 300. two bullets through the same hole the rest touching each other. Nosler E tips. Done after looking in to reloading Manuels until my eyes were bleeding. Some of the WBY rifles seem to handle reloads easier that others. I have a 257 WBY I just purchased and it loves the factory ammunition. Factory ammunition has come a long way. Even though I reload for savings, it pretty hard to beat factory ammunitions. I did get lucky and found a good load for my 257. From what I read your scope and mounts are solid, it just seems that you need to come up with a good load. Take your time, like I said it took me a long time for my 300. Good luck.
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  #36  
Old 02-03-2017, 08:44 PM
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Quote:
Originally Posted by morgaj1 View Post
I would try IMR-7828 or RL-22.
Yes, and Yes. Very good results indeed. 7mm & 270 Large case necked down, slow the burn rate.
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  #37  
Old 02-03-2017, 11:43 PM
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When I've loaded for these Wby mag cartridges I just about always found the heavier bullet for caliber shoots best. 150 BTSP should shoot very nicely I'd think. being pushed by a nice slow burning powder that's been worked up with a deliberate no non sense approach, lit with a CCI-250 or a BR2 primer, necks turned a touch, and seated a good distance off the lands. Do that with any good hunting bullet and you should find that 1" or better load, it's there.

SMOA
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  #38  
Old 02-04-2017, 03:59 AM
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I load the same gun for my BIL, 130 NOS BALLISTIC TIP, 70.5 gr of RL 22, Fed 215 primers, COAL 3.300 He has an older gun but same model. It is used in the bean fields in Louisiana. Maybe this will help.
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  #39  
Old 02-04-2017, 07:20 AM
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Quote:
First off, I run a 270 Weatherby, it is very accurate, even with the freebore at .375".
Does anyone have literature from Weatherby, the free bore was not a wild guess and they were not bashful about publishing information. .375" I have checked wildcats for free bore, when I find one with that much I always ask: "What were you thinking?" And then I ask if they still have the reamer etc. and I always leave them an out, I ask if they cut the chamber..

F. Guffey

Last edited by fguffey; 02-04-2017 at 07:24 AM.
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  #40  
Old 02-04-2017, 07:37 AM
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I've had troubles loading lighter end Ballistic tips and getting them to shoot in Hot Rod cartridges. (300RUM, 25-06) I think the thin "varmint" jacket is to blame for more than meat destruction.

Sadly WBY Shooter hasn't been back with any news . . . . . .

RJ
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