I have a SRH 7.5” and when I tried 300gr. Xtp mags loaded to max the cases stuck in the cyl. But all the other bullets I’ve tried with max loads (Speer, Sierra, CP) worked fine.
But I do remember reading somewhere that the steel Ruger uses on the cylinders with the SRH 454 expands and contracts when fired and that’s what caused the sticky cases.
I think someone on the internet is very mistaken about expansion and contraction. I own three 454 revolvers, Super Redhawk, Blackhawk and Freedom Arms. I have yet to find a load under 62,000 in the Redhawk which results in the conditions you describe.
Here is a very informative article on the metallurgy of the steels used in a 454 Redhawk
http://www.modernapplicationsnews.com/articles/m0401stainless.htm
