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Big wild cats certainly are a whole different ball game all together.

I'll stick with my common 7mm RM I think :D

Notice in the 1st article I posted there are some very interesting points regarding ackley case shoulder angle, suggesting almost straight taperd angled cases reduced bolt back thrust, had better...

http://www.longrangehunting.com/forums/f19/rem-700-action-how-much-chamber-pressure-safe-40117/

This post by Kirby Allen is what I was after. Very interesting reading and relevant to spanners post...

Pressures, Case Strength and Back Thrust

You would think so but according to the articles apparently not.

I'd pick that the bigger harder lugs will make bigger fuck off marks?

I'd be more concerned about bolt locking lugs under excessive pressure and possible damage to the bolt or action from lug set back.

Plenty of articles floating around on the subject by reputable...