Don I think it has more to do with oversized chambers. I find this going on more with the standard chambers diameters then the tight chambers I use for the PP bullets only where a GG just will not chamber. But it is not a cure it will still cut with a bad wad stack.
Think about this once. You have a standard chamber and you are using a PP bullet that is patched to bore or even a thousand over. When you put a wad on top of the powder and the wad is easy to push into the case, or you might say loose, and when the charge goes off it pushes the case walls tight against the chamber wall the wad is even looser now and this gives the gas to leak past the wad. The same goes for a GG bullet. With a GG bullet that is a thousand over groove diameter or a little more I have found very few bullets with cuts. The bullets at .458 or the .40's that are .408 seem to get cut more before it bumps up in the case mouth. I don't know what a bullet with run out does as far as getting gas cuts, I have never checked this out.
A PP bullet with out a lube wad and a none expanding wad like a cork or maybe a felt wad has a good possibility for cuts in loose chambers.
I ran some felt wads last year in the .44 with a .023 OJ carton wad over the powder a lubed felt and a second .023" under the bullet and found a couple gas cut bullets out of 15 shot, just slight nibbles like a mouse nibbling at the base. But the felt wads cut for a .45 and used in the .44 I have yet to find one.
So far this winter I have over 400 in the snow. Not to see what is going on but just to blow out the sized down .45 basic to .44. But about 100 I want to see
Kurt
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