Do I need gas checks?


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GIJOEL
August 14, 2010, 08:55 PM
I'm planning on loading some 150gr cast lead bullets for 7.62x39. I'm using straight wheel weights for the lead alloy. Do I need gas checks? Should i lube the bullets? I was planning on using IMR 4198 because I have a full can of it sitting on the shelf. Any ideas on a good starting load?

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Jim Watson
August 14, 2010, 08:58 PM
Do your bullets have the base relief for gas checks?

GIJOEL
August 14, 2010, 09:33 PM
I beleive they do have a relief, the mold i'm using is a lee 155 gr 2 cavity. While the mold is listed to drop 155 it seems to be dropping closer to 150.

W.E.G.
August 14, 2010, 09:49 PM
You are using mold C312-155-2R.

The "C" prefix indicates the intended use with a gas check.

http://www.leeprecision.com/graphics/bullets/c3121552.gif

See: http://www.leeprecision.com/html/catalog/bullmol2.html

GIJOEL
August 14, 2010, 09:57 PM
Thats the one, so I guess I need the gas checks. Okydoky, any ideas on a good lube? Or an idea on a starting load with IMR 4198?

Jim Watson
August 14, 2010, 10:04 PM
Well, you could try them without but I never had much luck at that.

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