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Reloading Techniques For Reloading


340 questions

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Old 11-21-2007, 11:56 PM
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Join Date: Nov 2007
Posts: 72
340 questions

I'm thinking about having my m70 rebarreled to 340wby with a 28 inch tube and was hoping to get some 250's up to 3000fps or better is this posiible I know I could just go with a bigger cartridge but I don't want to I was going to use a broughton barrel. any help or advive is appreciated.
thanks possum
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Old 11-22-2007, 12:36 AM
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Join Date: Jul 2004
Location: Texas
Posts: 5,444

You should be able to reach 3000ft/sec with the longer
barrel and standard Weatherby chamber (lots of freebore)

Also hold the headspace to .001 to .0015 to help accuracy.

Weatherby's factory loading of the 250gr is 2980 with a
26in barrel.

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Old 11-22-2007, 03:47 AM
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Join Date: Nov 2007
Posts: 51
I built a 340 with a 28" douglass XX about 30 years ago and it is a great shooter. I started shooting the 250 sierra gamekings when they first came out and got over 3000 fps with 7828 powder. Those were the only long range hunting bullets out at that time. It was amazing how they would take an elk way out there.
Lost in Thought, Please send Search Party!
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Old 11-22-2007, 10:33 AM
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Join Date: Jun 2004
Location: Texas
Posts: 1,027
Be sure the M 70 has a long enough mag well. About 3.6" minimum unless you are going to single load. I think 3000 fps is possible with 28" of barrel, probably with RL 22 or 7828. Fed 215M primers will bump the velocity a little also. Ease up to it though, that's a tough neighborhood.

+1 on the factory std chamber with freebore. The .340 is a surprisingly efficient cartridge, and will get hot quickly if you crowd the bullet too much.

Good choice, great cartridge. Hope it works out. Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member

A big fast bullet will beat a little fast bullet every time

Last edited by specweldtom; 08-22-2008 at 03:48 PM.
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Old 11-22-2007, 11:54 AM
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Join Date: Nov 2007
Posts: 72
thats my only problem is the mag well is to small I will single load until I can get a wyatts box or something anyone know of anything else like that out and how much it costs .
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