Well, just to toss out a counter of sorts......

My Field grade FA 454 has been carried a lot in hunting stuff, and actually more everyday at the ranch when doing chores. And it wears ivory grips.

It's been wet, dusty, covered in chain saw chips etc., and never had a problem with it being to tight to function. At the ranch it might go three or 4 days, being shot, not cleaned, shot some more rinse repeat until I get back home. It's never had a reliability issue. About the only thing I have not done is run it through swamps and mud. None of that around here.

I think any reasonable holster that is gonna be used on a FA or custom gun should do well to keep the sand and twigs and gravel out of any gun.

If you are worried about bumps and bruises, I would think that the cringe factor would be the same on a FA or custom gun. Either is going to cost. But I would not say that a FA is too tight for hunting or carry, at least not for me.

Craig