some impacts will bottom out a shock no matter how over-sprung it might be. Your classic 'g-out' is a fine example: as the term implies gravity is making you heavier, and in turn making the force of the impact much greater. A heavier spring does little in this situation, only a change in damping will have much effect. However, tuning damping solely for such an event would not give you very nice handling characteristics the rest of the way down the hill.At your size, with that spring you should not be bottoming it.
At my size (245) with a 500 on a VPF (granted diff suspension, but has a higher leverage if anything) I rarely see bottom (1-2x a big ride/mountain day) with ZERO compression/propedal clicks, and the bottom out half way in.
Something IS wrong with the shock!(or u r really 300lbs)
G-outs are not the only example and different bikes, in combination with different compression settings, shock characteristics, and rider position will bottom out hard in some unexpected places now and again. no design is going to handle every possible scenario.
I'll hazard a guess the shock is 100% okay. There is also the distinct possibility that the particular bike might not be the the best choice for the kind of riding being described, or that the rider is doing a poor job compensating for his suspension's limitations, i.e trying to let the shock do all the work.
also, the comment in bold is what i was referring to earlier when i said bottoming gets a bad rap. On any given run I probably bottom out my Sunday a minimum of 6-10 times, and that's a conservative estimate.
I'm bowing out of the conversation at this point as discussing suspension on RM is like teaching the blind to juggle.