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help sizing .30-378wby brass

 
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  #8  
Old 09-08-2007, 07:20 PM
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Location: Texas
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I load .30 x .378 and .338 x .378. Full length resize both. The sizer die is set by screwing it down until it stops on a fired case that has the neck cut off in the middle of the neck radius (depending on where you cut the neck, you may want to pull the expander plug). Turn the die in handy on the case, and lock it down. This only works if you shoot the brass in the same rifle. The shoulder won't wrinkle or cave in this way. The .30 by shoulder is a little more fragile than the .338, but both require thin sizing lube inside and outside and thorough cleanup. You may booger up a few cases before you get it like you want it.

Ditto on the primer pockets; mine get loose at 4-5 firings. If I knew how to tighten them up again, the rest of the hull would probably make 4 or 5 more firings.

My go-to hunting rifle is my .30 by, Henry Wayne, (you might be a redneck if you name your rifles). #2 is my 7mm-08 named Ugly Baby. Henry Wayne is sub 1/2 moa, and Ugly Baby is sub 1/4 moa. Both are way better than I am.

Got long winded again, good hunting, Tom
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  #9  
Old 09-09-2007, 10:32 AM
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30/378

Sounds like a lot of good advice.

The trick to Weatherby or any belted magnum case is that the
head space needs to be .001 or less and the chamber needs
to be concentric. Then size as close to full length as possible
with out touching the sholder of the case.

By doing this everthing is aligned prefect an the problems with
freebore are eliminated .

If the head space is more than .001 or .002 thousandths thenI would
recomend neck sizing only."BUT" before you go hunting try each round
to make sure they will go ( A common practice with dangerous game
rifles even with full length sizing to avoid a problem at the worst time).

So start by checking the head space on your rifle and go from there.

All you need to check head space is a small peice of brass shim stock
.002 and some grease to make it stick to the bolt face . Cut several
pieces small enough to fit in the bolt face without touching the extractor

Being very careful use a new factory round and close the bolt on it
with one of the brass shims stuck to the bolt face if you feel a slight
resistance then take the shim out and try it with out the shim. If it
feels the same add two of the shims( You should'nt be able to close
the bolt with out forcing it"DON'T" .

Of course if you have access to a head space gauge please use it first
to avoid using a live round.

One of my Weatherby's shoots a .091 5 shot group set up this way.

Good luck
J E CUSTOM
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  #10  
Old 09-09-2007, 10:32 PM
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Join Date: Jan 2006
Location: Nebraska
Posts: 507
For 30-378 I use a full length bushing die, I do not like dragging an expander through the neck.
I also have a 30-378 neck sizing bushing die and don't use it because with max loads they need to be FL sized. If I was going to shoot mild loads I'd use the 300Wby.
James
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