Originally Posted by
elwood4884
Motor is right on this. Aluminum checks work great if they are sized appropriately to fit your bullet. To determine the best thickness check for your bullet you need to do a little math.
T = (Sd - SHd) / 2
T = Material thickness required.
Sd = The Bullet Final sized diameter
SHd = The Bullet Gas Check Shank Diameter
Once you have that stickness you should be able to get checks that would fit perfect to your bullets. In my experience your probably looking for a 0.010 thickness check. Most aluminum checks out there on ebay are 0.0145 or similiar.