Gaschecks are hard. They don't expand on firing, so an undersize gascheck bullet is as bad as one made with a plain base when it comes to leading. The name "gascheck" was given to these little slivers of copper more in the hope that they would prevent gas blowing past the bullet than from their actual performance along this line! A Wonder Wad or fiber disc wad on top of the powder does just as good a job at this function, or better!

I am talking about what has worked well for me. If it doesn't work for YOU,shin loi!!