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300 win mag is splitting cases.

 
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  #1  
Old 11-14-2010, 04:36 PM
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300 win mag is splitting cases.

Has anyone had this problem? 300 Win Mag. The case is splitting right above the belt. I am using a 168 Berger VLD, with 74 grains of H 4350. The Brass is on its second Load. The load is not too hot, but could be a little cooler. I shot some factory ammo through the rifle, and it is showing a faint ring where the reloads split. The rifle is a Thompson Center Pro Hunter.
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Old 11-14-2010, 08:35 PM
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Re: 300 win mag is splitting cases.

Gosh thats crazy sounding. I have no experence with something like that at all. Have you inspected your chamber to see if there is a gouge in there?
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  #3  
Old 11-15-2010, 12:28 PM
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Re: 300 win mag is splitting cases.

What brand of brass are you using. In my Ruger No. 1 I get away with only neck sizing my brass.

Normally if you full length re-size 300 Win Mag will run 3-4 reloads, and the third time you shoot the same 20 pieces of brass 2 of them will split there above the belt. I'm not sure on belted Mags, the clame is that neck sizing increases the life of brass 10 times. I do it because there is less trimming.

I use Winchester brass, they are more consistent shot to shot. I think Rem Brass is a bit softer and maybe more forgiving in this dept.

Is your rifle new, or used? Sounds like excessive headspace, if it's used then some one put some hot loads in it. I would have my headspace measured, even if it's new. If you are not neck sizing, I would give it a try. I adjust my die so it only sizes the neck, and doesn't touch the shoulder.

If I'm not mistaken 4350 is a little slower than 4831, might need to seat your bullets closer to the lands, you might be getting a pressure spike. Not entirely the same as overpressure.

I was reloading some really cheap brass for .223. A brand I never heard of, and about every 20th case split when I put them through the SB resizing die. They were once fired. I think it was a bad alloy.

Hope this helps a little.
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Last edited by BigSkyGP; 11-15-2010 at 12:43 PM.
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Old 11-15-2010, 01:44 PM
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Re: 300 win mag is splitting cases.

Boattail 25,

You've got yourself a headspace problem there, even if your headspace gages out just fine; this is one of the quirks of belted cases, and why the newer family of magnums (like the RUMs, the SAUMs, WSMs etc), have done away with them. They were needed when the original magnums were developed due to manufacturing capabilities of the day, and their inability to control headspace of those long, tapered cases like the 300 and 375 H&H mags. They actually weaken the case, from an engineering standpoint, and complicate the reloading end of things today. For a case of modern design, like the 300 Win, they're nothing more than a decoration. Your cases are stretching within your chamber, and that's what's giving you the separations and/or cracking. With it's doing this on the second firing, it'd be worth having the gun checked, but it may be due to the action springing slightly, since the T/C isn't going to have as strong of a lockup as a bolt gun. Beyond that first firing, take the advice BigSky offered about neck sizing, or at least, adjusting the dies to avoid setting the shoulder back anymore than need be for the rounds to chamber. Normally, if you treat the belted rounds like normal rimless designs, they will last a lot longer than if you continue to headspace them off the belt. Hope this helps, but let us know how it works out for you.
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Old 11-15-2010, 01:46 PM
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Re: 300 win mag is splitting cases.

my 300 would split the cases as well with only 73 gr 4350 and 168 bergers. my bolt lift was easy and primers were not flat. I switched to shooting 210 gr bergers and retumbo powder and have never had the problem again.

I think BigSky is right about the pressure spike because nothing else showed signs of pressure.

I also only neck size.
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Old 11-15-2010, 07:32 PM
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Re: 300 win mag is splitting cases.

Thank you guys for getting back with me. I had a friend tell me the same thing about the neck sizing instead of the full case. This is definitely the 1st thing I will try. The brass was a originally a cheap box of Federal from Walmart. I thought that I could plink around and use the brass for some more serious shooting. This may be the problem as well. The rifle is new. It has had only 60 rounds shot through it and 40 of those were factory rounds.
I have only been reloading for about 2 years, so there is still a lot that I do not know. It is awsome that there are forums like this one that a guy or gal like myself can go when they have a question.
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Old 11-16-2010, 09:08 AM
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Re: 300 win mag is splitting cases.

Quote:
Originally Posted by boattail 25 View Post
Thank you guys for getting back with me. I had a friend tell me the same thing about the neck sizing instead of the full case. This is definitely the 1st thing I will try. The brass was a originally a cheap box of Federal from Walmart. I thought that I could plink around and use the brass for some more serious shooting. This may be the problem as well. The rifle is new. It has had only 60 rounds shot through it and 40 of those were factory rounds.
I have only been reloading for about 2 years, so there is still a lot that I do not know. It is awsome that there are forums like this one that a guy or gal like myself can go when they have a question.
>
I would try some virgin brass. It should be slightly longer than factory ammo brass. which will give you less of an initial stretch, when you fire them to fit your chamber. Virgin brass is usually long so it will need to be trimmed to length.

Even though it's new, and T/C's are good, I'd have the headspace checked. Insurance that is figuratively cheap. If there is too much head space you should still have support from T/C. I wouldn't mention to T/C you were shooting reloads. Usually voids Warranties.
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