gas check mold question

[walker77]

I bought my first gas check mold. And i need to know the basics on this. Like on my other bullets, they need to be a thou or so over slugged size. So do the gas check bullets need to be the same way, or are they more forgiving?

[Wayne Smith]

Technically, no real difference. In practice, since most gc boolits are cast harder and can't rely on expansion, size is probably a touch more critical. A .001-.002 over groove size is what you want.

[mooman76]

You can shoot them without G/Cs but you can't push them as hard.

[kcajeel]

If you do shoot them without the gas checks, and do download them a little, how bad does your accuracy suffer?

[dromia]

Depends on the rifle, a lot of us shoot the little Lee 311" 113 gn boolit in .303"s over a pinch of fast powder for use on 25 yrd indoor ranges.

Most shoot the boolit well ungaschecked, but a few rifles including my No4T won't shoot them unchecked at all. Put a check on them and they shoot great.

So to answer your question, you'll need to try it and see as all rifles a laws unto themselves.

[Bret4207]

If you do shoot them without the gas checks, and do download them a little, how bad does your accuracy suffer?

There's a whole section down the page labeled "GAS CHECKS". Your answer to the no GC on a GC design is there- about 300 times.