why the 41 is like that is beyond me.
the gun makers get it right, but a gas check shank is beyond the scope of mere mortals.
I waste about 25% of my 41 cal checks, even after punching them open,,,, frustrating.
Yeah, I know we've talked the 41 GC thing a number of times over the years.
My personal situation is this...and is even more exasperated even more than what the industry has done.
I have the Ideal/lyman 410610 and found when I cast with mold extra Hot, the vintage Ideal/lyman GCs seat easily, and I currently have a lifetime supply. btw, I had a few unsized bullets laying around (for age hardness testing, maybe?) but they are ones with sharp edges, so were not cast with extra hot mold, I measured the Shank, .400 and I suspect by casting hot, not only is the base edge rounded, I imagine the diameter is about .001+ smaller. The Gators must be a wee bit smaller than the vintage Ideal/lyman (I didn't measure them).
Now, I also have a 5 cavity Arsenal 410-200 RF mold, four are PB and one is GC. Here's the kicker and why I was considering this purchase I mentioned about. The GC shank of the Arsenal mold is .391 The Gator GC is spec'd for .397 and seats real loose, but will squish/crimp on. Maybe I'll hone out that cavity a wee bit?