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  #1  
Old 04-07-2008, 02:58 PM
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How best to reload a 300 Win Mag


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Hi everyone. I am going to start hand loading ammo for my 300 Win Mag. I have a buddy who has all the equipment and manuals we will need. However, he has no experience with any 30 calibers and I have no experience period. My rifle is sighted in with 180 grain Nosler Partitions by Federal Premium ammo now and that works really well. It has a 24 inch barrel, but, I am not sure what the twist rate is. It is both my deer and elk gun for the time being. However, I use it primarily on deer. The typical range for deer I will be using it for is around 100 yards, maybe 200 yards, definitely not more than 300 yards for deer. What is the recommendation for powder, primers and bullets. If I do not use partitions I would like to switch to a boat tail of some sort. Thanks.
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  #2  
Old 04-07-2008, 04:41 PM
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Boat tails really only start performing well past 500 yards. Any of the quality 180 grain bullets will work and the partitions are good ones. I'd stick to 180 grain bullets as lighter bullets will start giving you dramatic meat damage at the ranges your talking about.

I alway had good luck with 180 grain Sierra Game kings loaded with CCI mag primers and 4831. Just use a good reloading manual and work your loads up. Usually a load 10 percent under max will only loose a 2 percent velocity and almost gives better accuracy than a max load.
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  #3  
Old 04-09-2008, 12:00 PM
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Thanks Bob.

I read in an old post (from 2003 I think) that one person was having problems with once fired brass out of there 300 Win mag. Is this a common problem. I have a few once fired brass that I was going to start reloading with. Is this a bad idea or should I start with new brass? Has anyone else had this problem? Or better yet, has anyone been successful in reloading 300 Win Mag brass multiple times?
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Old 04-09-2008, 12:05 PM
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Some of the brass for my 300 Win mag, 308 Norma mag and 8mm Rem mag (all belted magnum cases) have been reloaded up to 20 times. You'll start having brass failures only if you are loading extremely hot. This exhibits itself in loose primer pockets, ejector marks on the back of the case, hard extraction (hard bolt lift) and early head separation.

Set up your dies so the cases headspace on the shoulder just like any non-belted case and the cases will last as long as any non belted case, i.e. the 308, 30-06, 270 and so on.
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  #5  
Old 04-10-2008, 01:35 PM
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I had great success with Hornady 180 grain bullets (flat base, not boattail), and Hogdon 4831. My accuracy was always great for a hunting weight .300 Win Mag (sub one inch three shot groups were common), good velocity (about 3000 fps) and very minimal extreme spread (often less than 20 fps). I also headspaced on the shoulder, and I used once fired brass that came from other rifles than mine. I often got at least 10 reload with the brass.
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  #6  
Old 04-10-2008, 02:46 PM
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A couple of things -

I no longer own a 300 Win Mag but used to. It was the first cartridge I started loading for when I got into handloading. It is no more difficult or challenging to handloand than any other cartridge. What I found was my Forster Co-Ax press didn't have a sufficiently large opening to reload it without fumbling with bullets during the seating step. I switched to a Redding Ultramag and never had another pinched finger.

If the brass was fired in your gun you can neck size it with the appropriate die and reload it several times before you experience a brass problem or failure. This is especially true if you stay away from the top end of the powder charge scale. But....it was usually near max powder charge where I got the best accuracy.

If the brass was fired in another gun you need to Full Length resize it with the appropriate die.

Annealing the neck and soulder will extend the life of the brass and give you more reloads than not annealing.

IMO - The 300 really shines with 200 grain bullets. My favorite load was a 200 grain bullet over a full case of Retumbo powder and Winchester LR Magnum primers.

A 180 grain bullet is a good choice for a light bullet and some like to use 165 grain bullets too. I would stay away from lighter weight bullets in the 300.

My guess is your gun will have a 1:10 twist because long heavy bullets are common factory fodder.
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  #7  
Old 04-12-2008, 04:11 PM
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I currently load for three .300 Win Mags.

I used to monkey around with loading for each of them. Then I stumbled across a load that shoots 1 1/2" or less in all three guns and that's all I do now. It's a 180 gr. Speer Grand Slam over an older Lyman manual's max charge of IMR-4350 and a Fed-215 primer. Pretty much good medicine for whatever ails you on this continent and light on meat damage. The .300 can be brutal for meat damage with lighter and lightly-constructed bullets.
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  #8  
Old 04-16-2008, 06:58 PM
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I would buy a few reloading manuals and bone up on them. I found that flat base bullets are more accurate boat tails with in the range I hunt.500 yrds is my max range for hunting and I only have one rifle I'm comfortable shooting at game that far.By all means try out boatails and any other bullet configurations,You may find your rifle may like a particular brand and weight.Besides half the fun is loading up different loads you xcan't buy and trying them out
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  #9  
Old 04-17-2008, 08:56 AM
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Don't neck size or partially size. You are asking for problems, especially with ammo you are using for hunting. Get a good set of digital calipers. Buy the Hornady (use to be stoney point) head space gauge set. Use the .420 for the .300 Win. Mag. Get a reading off of a few fired cases shot in your gun. Set your die up to size to HEADSPACE on the SHOULDER(bump it back) .002"-.003" shorter than your fired cases. Your brass will last a long time. You will be surprised in some readings. I had some .300 win. mag. brass that was given to me that had been resized by someone else. It was sized a good .020" short! You don't want to bump the shoulder back more than .005" in a bolt gun.

GET the calipers and the GAUGES. Set your dies up properly. The information given by the mfg. about screwing the die down and turning is NOT accurate.

You can get away with using a drop in cartridge case gauge made by wilson or dillon if you load standard cartridges. But since your loading for a belted case,get the Hornady set of head space gauges. They work with almost any cartridge. They are easy to use. It will be worth it.

Years ago, I was loading for a .338 win. mag. Without using proper gauges (I didn't know any better) I would get about 3 loadings before I got full case head separations. I must have been over sizing the brass to the extreme.

Stay with powders in the IMR 4350 and slower catagory, 4831, IMR 7828, H-1000 etc. and use magnum primers. Lighter charges of mid burning rate powder ( 4064 )may cause hang fires. I had a terrible problem in my 300 Win. with medium burning powders, primers didn't make a difference.

Good luck.

Last edited by FLIGHT762; 04-17-2008 at 10:18 AM. Reason: addition
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  #10  
Old 04-17-2008, 10:01 AM
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Quote:
Originally Posted by DLB59 View Post
Hi everyone. I am going to start hand loading ammo for my 300 Win Mag. I have a buddy who has all the equipment and manuals we will need. However, he has no experience with any 30 calibers and I have no experience period. My rifle is sighted in with 180 grain Nosler Partitions by Federal Premium ammo now and that works really well. It has a 24 inch barrel, but, I am not sure what the twist rate is. It is both my deer and elk gun for the time being. However, I use it primarily on deer. The typical range for deer I will be using it for is around 100 yards, maybe 200 yards, definitely not more than 300 yards for deer. What is the recommendation for powder, primers and bullets. If I do not use partitions I would like to switch to a boat tail of some sort. Thanks.
I reload the 300 WM. I started with 180 gr Nosler partitions and then tried other bullets such as Sierra spire point, Speer grand slam, and Swift Scirrocco. In my rifle, Ruger 77Mk2, the best accuracy was with the Partitions. The Grand slam and Scirrocco did not fare as well. A variety of powders worked well, including H4831, 4064, 4350. My rifle seemed to be more sensitive to the bullet rather than the powder as far as accuracy was concerned. In fact several powders shot to almost the same point of aim (close enough for most hunting). I found best accuracy as I worked up toward max charges. I loaded 5 of each charge and worked up, found the most accurate load and stuck with it. No need to try for the highest velocity unless it also happens to be the most accurate. I use CCI primers, Federal cases (both brass or nickel). I full length resize and space on the belt. I do not neck size only for hunting loads as I want to be sure of feeding reliably more than the utmost accuracy.
Enjoy your testing and load work. That is satisfying and a lot of fun.
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  #11  
Old 05-17-2011, 02:14 PM
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I load for extreme long range but this load is 1/4 moa or better. Berger 210 GR VLD on top of 76 GR of H1000 and CCI Magnum primer. Cases sized till the bolt was hard to shut, then ran the die an 1/8 turn back down and locked it back in. pill loaded to sit .010 off the lands (barely fits in the magazine those VLD are LOOOOONG)

This is going down a krieger #10 MTU tube at 26". 76 GR is on the warm side but no pressure signs. at about 76.5 gr started to see soot on the case neck and lost about 1/4 moa of accuracy and only gained .50 FPS. Like other have said these magnums like near max loads and going over board really doesn't get you much.

Also google "gun juice" it sounds like snake oil but I can attest It take three patches to clean my bore after 20 rounds and brought back a lot of lost accuracy.

190GR matchking would be an excellent pill for what you want. IMO stay away from re22 it burns real hot. The H1000 isn't very temperature sensitive at all which is awesome for hunting, it also meters beautifully.
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  #12  
Old 05-17-2011, 02:21 PM
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Holy resurected thread, Batman!
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  #13  
Old 05-17-2011, 02:46 PM
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Originally Posted by Saskshooter View Post
Holy resurected thread, Batman!
sorry found this thread looking for 108gr amax loads.
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  #14  
Old 05-17-2011, 03:36 PM
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Ill bet Reloader 22 or RL 25 will do a good job. Check Alliants website for recommendations.
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  #15  
Old 07-21-2011, 06:55 PM
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Flight762+1
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  #16  
Old 07-21-2011, 08:44 PM
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Smile sierra 200 grain spitzer boat tail

For over 30 years I loaded the sierra 200 grain spitzer boat tail with 72 grain of IMR 4831 in winchester brass for my Ruger # 1. chronographed at 2978 fps. I've shot a lot of moose and caribou with this load in this rifle here in Alaska. Two moose at 350 yards. They just go down!
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  #17  
Old 07-22-2011, 05:53 AM
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Magnumitis sounds like he has a real good all around .300WM load there . Bump the Shoulder just enough to make your Ammo chamber easily , and then start Load development ! My .300 powder has been IMR-4350 , it works in my Son's Ruger and my Rem. 700 , as we all know , each individual Rifle has its own quirks !
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  #18  
Old 07-22-2011, 04:49 PM
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Pick one bullet or bullet weight, sounds like 180 and stick with it.

Check a couple loading manuals and try powders sugggested here-try to use just one.

Can try slightly longer ammo than the manual suggests, so long as it feeds thru the mag. Pick a good length and you are set. One bullet, one powder and a good length and then load all the cases you have.

Earlier I suggested RL (Reloader) powders. They are good.
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  #19  
Old 07-23-2011, 02:31 AM
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Back when I hunted with smokeless powder rifles I used a 300 WM frequently and my go to load for that rifle is a 180 gr. Sierra Game King over a forgotten amount of IMR4831, Federal cases and CCI Magnum Rifle primers. Another 300 WM I had was for long range target work and it liked a 190 gr. Sierra Match King HPBT over 71 grs. of IMR4831, same cases and primers.
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  #20  
Old 07-26-2011, 06:21 PM
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I started loading for my .300WM last year and have settled on the Berger 168 gr. VLD Hunting bullet, 83.5 grs. H1000, Remington cases and Fed 215 primers.
This load will shoot 1/2 inch or smaller groups at 100, but I am having a problem finding another bullet and powder combination that will do as well. I think I will just take that previous advice too and stick to this one load.
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