Gas checks

[pklin1297]

Hello all,

How do you install gas checks on lead bullets?

What is the general rule of thumb when it comes to when gas checks are needed? I've read on another reloading site that only when your load is 900 fps. or more should you need gas checks installed to avoid excessive lead fouling...

thanks.

[rksimple]

I do it in the luber/sizer. Put the gas check in, put the bullet in, then run it through. I haven't used the Lee type where you push it up through a sizing die using a standard press, but it looks interesting. As far as when they're needed, I've loaded 357's up to about 1100fps with no gas checks and not had leading problems. Of course that's using a good alloy and plenty of lube. All of my cast rifle bullets wear gas checks though.

[ocabj]

As far as when you need a gas check, beyond 1500fps is a good mark to go by.

Gas checks aren't really meant to prevent excessive lead fouling. It's actually meant to prevent the base of the bullet from deforming as the round is fired which would hurt accuracy. Granted, if the base deforms, there might be more lead fouling. But gas checks are not designed to directly limit lead fouling.

[Budd]

I was advised not to ever use a gas check if it is going to be used in a revolver. Is this good practice? Something about the gas check creating excessive wear - as well as shrapnel from the end of the cylinder?

[rksimple]

I was advised not to ever use a gas check if it is going to be used in a revolver. Is this good practice? Something about the gas check creating excessive wear - as well as shrapnel from the end of the cylinder?

Haven't heard that, but that doesn't mean anything. I've used gas checks on some hot 357 mag loads and some 44 mags and haven't seen any issues.

ocabj-you're right about gas checks preventing deformation. It also thereby reduces leading. Hotter, higher pressure gases around an exposed lead base will cause leading. In pistols, sometimes a slower burning powder helps to reduce leading. Moreover gases slipping by the bullet, be it as a result of too little or wrong type of lube, improper sizing, wrong alloy, etc, will cause even more leading problems.