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  #1  
Old 01-02-2017, 07:30 AM
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270 Weatherby Accuracy


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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?
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  #2  
Old 01-02-2017, 07:36 AM
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It sounds to me like the twist rate is not friendly to such light bullets. Have you tried loading any 130s?
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Old 01-02-2017, 08:53 AM
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Reloaded a 270 for vermint..

the 100gr were ok at closer ranges --- the 90gr were a waste of time -- recommend you stick to 130's & above.
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  #4  
Old 01-02-2017, 10:19 AM
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270 accuracy

Sorry, the weights I referenced were the powder. I was using 130 gr Nosler Ballistic tip.
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  #5  
Old 01-02-2017, 10:46 AM
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You could try slowing them down...

to see if they'll print but my experience is that magnum cases do best with heavier bullets which are the best way to mitigate the effects of wind. It would be interesting to see how your gun does with 170gr Berger bullets.

If you can't hit'em you might as well throw a rock.
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Old 01-02-2017, 12:47 PM
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Rather than just picking a random charge while hoping it will perform well, try performing an actual load development. And if a particular powder doesn't get you desired accuracy, switch powder and begin another development. But generally most powders will have a particular accuracy node some where in between minimum and maximum, you just have to locate that accuracy node.

Then there's OAL, or distance to the lands. Obviously if this is a Weatherby barrel you're probably not going to be able to get close to the lands, but changing OAL can still have an effect on accuracy.

Have you done anything to reaffirm that the scope isn't slipping or torquing? When ever I start cold with a newly mounted scope I always place a piece of tape in the front and in back of the rings. I place it on the tube and get it even with the edge of the rings, that way if the scope mves at all it will be easily discernible.

Are you shooting off bags, or off of a sled or other rest?

FYI, I don't know which published data you're using, but Hodgdon shows 72 gr. H4831 as being 2.0 gr. over published max with a 130 gr. SP. This may not be the case with Nosler or some other published source, but it is on Hodgdon's site.

SMOA
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  #7  
Old 01-02-2017, 02:18 PM
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Submoa,
Thanks for the response. I believe the scope is properly mounted including lapping with the Wheeler lapping tools. Knowing I have shot under 3/4" at 100yds with factory ammo. (Weatherby Select 130gr) I am pretty sure it is the loads I have tried. Shooting was done off bags front and back. I will try the tape test you suggested. The H4831 load was from the Nosler manual. Do you have a powder you would recommend? I was looking at IMR7828 and RL19 or RL 22.
Thanks
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  #8  
Old 01-02-2017, 03:32 PM
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I would try IMR-7828 or RL-22.
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  #9  
Old 01-02-2017, 04:05 PM
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Just wondering is your rifle a Weatherby and how deep are you seating your bullets I have not loaded for my 257 yet and it is not a Weatherby rifle but everything I have read tells me that Weatherby rifles have a long throat and they like the free jump to release a bit of pressure
I know when I load mine I plan to go with a bit more jump than I usually go with at least go start
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  #10  
Old 01-02-2017, 04:44 PM
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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?
Did you load to same OAL as factory? Freebore 270Wby is .378". I shoot 150gr in my 270Wby and use IMR-7828ssc,Fed 215 primer. In Nosler manual they use IMR-7828.

I'm not much into 130/140gr for that rifle as I may use on elk tag and buck tag same season. If you look at hodgdon data for 270Wby 150gr Nosler partition max is 72gr @ 3215fps from 26" barrel and Nolser data same bullet/same barrel length their max is 70.5/IMR-7828 @ 3207fps. What you really need to look at is velocity. 130 gr data from both manual the difference in velocity is only 55fps for 2gr powder from Nolser data max for 130gr load was 3463fps and max load from Hodgdon was 3500fps.
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  #11  
Old 01-02-2017, 06:28 PM
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The easiest thing to do is change bullets. Granted BTs are generally pretty darn accurate, but you rifle may not like them.

Seat bullets straight. This is extremely important, and I think even more so in guns with freebore or a long jump to the lands. If you don't have a concentricity gage, get one. It will pay for itself in components saved. If your bullets aren't seated straight and/or the cases aren't resized straight, accuracy may be hopeless.

Size the cases to just fit the chamber. Lots of ways to do this and making up a homemade gage costs next to nothing.

But again, try another bullet first, after you have checked the above. Bullets normally have more of an effect on accuracy than the powder.

Good luck.....
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  #12  
Old 01-02-2017, 07:29 PM
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http://www.weatherby.com/support/faqs.270 Weatherby Magnum Weatherby 130gr Barnes TTSX
(B270130TTSX)
Weatherby 140gr Ballistic Tip
( N270140BST)
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  #13  
Old 01-02-2017, 07:41 PM
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Quote:
Originally Posted by WBY Shooter View Post
Submoa,
Thanks for the response. I believe the scope is properly mounted including lapping with the Wheeler lapping tools. Knowing I have shot under 3/4" at 100yds with factory ammo. (Weatherby Select 130gr) I am pretty sure it is the loads I have tried. Shooting was done off bags front and back. I will try the tape test you suggested. The H4831 load was from the Nosler manual. Do you have a powder you would recommend? I was looking at IMR7828 and RL19 or RL 22.
Thanks
I haven't loaded for the .270 Weatherby mag. in quite a long time, but no matter, two different rifles anyway. But personally I would make sure I've tried a few different charges first, H4831 should have an accuracy node some where within the table. If that doesn't pan out, I'd move to RL22, maybe start just a smidgen under mid table and begin working up. I'd also recommend using a magnum primer with RL22, it's shown to be a tough powder to attain an efficient burn in applications with heavy powder charges for me. From there I'd move onto IMR-7828, maybe H1000 next.

Since you were able to get it with factory stuff, the accuracy is there, you just need to find the right combination with your loads.

God day!
SMOA
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  #14  
Old 01-03-2017, 01:58 AM
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Slower powder, heavier bullet.

I don't know that I'd want to hit a deer with a 130gr BT, out of a 270 Weatherby; I process my own and have seen what that bullet does from the standard 270.

What is your goal with this rifle? Target, varmint, mule deer or elk? Magnum rifles are made to drive heavy-for-caliber bullets at the same velocity standard rifles drive the lighter bullets. Trying to put 130's into warp speed isn't the best use of your rifle.
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  #15  
Old 01-03-2017, 05:20 AM
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I'm in agreement with broom_jm, I have switched from 130s to 150s now in my .270WSM which has very similar performance to the WBY version.
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  #16  
Old 01-03-2017, 06:06 AM
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A too long COL causes problems.
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  #17  
Old 01-03-2017, 05:17 PM
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WOW, thank you all. Looks like I have my work cut out for me with lots of things to try. To answer a few questions,
Yes it is a new Weatherby mark5 Fibermark
The loads I tried were longer OAL than factory spec. I will try seating bullet back to factory OAL
Bought some IMR7828, R19 and R22 today. Lots of shooting in the near future.
Goal is fast, flat and accurate.
First hunt will be Aoudad in Texas early march.
Again, thanks for all the input. I will report back after a few trials.
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  #18  
Old 01-03-2017, 05:22 PM
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Also, yes, I am using mag primers
thanks
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  #19  
Old 01-04-2017, 01:22 AM
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Quote:
Originally Posted by WBY Shooter View Post
WOW, thank you all. Looks like I have my work cut out for me with lots of things to try. To answer a few questions,
Yes it is a new Weatherby mark5 Fibermark
The loads I tried were longer OAL than factory spec. I will try seating bullet back to factory OAL
Bought some IMR7828, R19 and R22 today. Lots of shooting in the near future.
Goal is fast, flat and accurate.
First hunt will be Aoudad in Texas early march.
Again, thanks for all the input. I will report back after a few trials.
One of the newer reduced drag 150's would likely meet your needs, once you find the load they shoot well with. The heavier bullets start out slower, but retain velocity better. Where long becomes LONG, they generally have a trajectory that is similar to, if not better than, the lighter bullets.
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  #20  
Old 01-04-2017, 12:24 PM
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WBY Shooter you say this is a new rifle and you shot factory ammo in it with great results. How many rounds did you fire ? Take a bore brush and get the powder fouling out so you can clearly see the rifling at the MUZZLE. Take a good BRIGHT flashlight and see if you can see alot of copper at the muzzle in the grooves and lands. For one I suspect shooting factory ammo at 3400fps probably fouled the barrel considerably and until you get the fouling out accuracy will suffer no matter what recipe you try. For 2, your handloads are likely nowhere near factory velocity so the twist rate of the barrel may be coming into effect. If you're using bullets with longer or shorter bearing surfaces than the factory at ALOT slower velocity, then they're not spinning as fast, and therefore not stabilizing well enough because of the change in velocity. I've seen it in 2 different 257WBYs, both had same twist rates but one had a 24" barrel and the other a 26" barrel. Yes I understand before I get jumped on that 2 different barrels will never give the same accuracy or velocity but some conclusions can be drawn from the two. What I did was chronograph both rifles, and the shorter barrel was naturally shooting slower, so I slowed down my loads in the 26" barreled rifle to match the 24" barreled rifle and VIOLA ! MY GROUPS OPENED UP TO THE SAME SIZE IN BOTH RIFLES. I knew then, it was the difference between the 2 bullets RPMs because of the change in velocity due to the shorter barrel. So I suggest you first clean the bore "back to black" yes it will actually be black once all copper is removed, then trying whatever loads you have worked up that have the same OAL as the factory.
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