Hello, Mauser Rat. I don't load for .44 G.C., but I did some checking:
for a .30 gas check..G.C. I.D: .318..nominal cast dia. .310.. .008".
7mm G.C. I.D.: .250" Nom. cast dia. .278 .. .028" ( I have a pre WW1 German sporter which takes a .288 cast, with this it would be .038" difference)
.22 G.C. I.D. .215" nom. cast dia. .225... .010"
That metal must go somewhere, I believe if you look at the base under magnification, you will see puckering around edge. The old master H.M. Pope said the bullet base was the "steering end". If any fins or non-uniformity present, this will cause fliers. I have heard about the aluminum slip-on checks, perhaps being so thin, they displace less bullet metal. However,being so thin, they probably lack the ability to be a good bore scraper as the thicker, sharp edged gilding cups. Best of luck!