I think conventional wisdom is fiber wads, because they "leak" more gas upon detonation will develop less pressure. I, for one, load 2 3/4" loads in 2.5" hulls by roll crimping. Once again, conventional wisdom says roll crimping will develop less pressure than a star crimp. That said, I don't trust any loads or advice garnered online, I send my handloads out for pressure testing if I think it is necessary. Cheap compared to replacing a gun.

"Every one must believe in something, I believe I'll go hunting today."