I had a problem installing gas checks on some Lee 310gr boolits today. I was pushing them through a .430 sizer, and there wasn't enough resistance to force the checks onto the boolits, as I wasn't actually resizing. Apparently the gas check shank is a little large, as I can't just place them on the boolit, but must force them on with a lot of pressure.
I was able to use the die to force checks on a previous batch of boolits, but not this batch.
I finally managed to get seat the checks by placing a piece of wood at the top inside of the press, putting the boolit nose down on the plunger, and pusing the check against the piece of wood. It seems that this method is hard on the press, and may make a small change to the shape of the boolit.
Also, this was tedious, and there were some that didn't seem to be perfectly squarely installed and were rejected.
Since the check shank is too large on my boolits, I don't see any way to fix this mold and this problem.
Any other ways to affix my (Hornady) gas checks to these oversize gas check shanks without relying on the sizing die?
Thanks - Randy