After encountering several hundred shooters that reload belted magnum calibers, I've come across VERY FEW that have experienced absolutely no chambering problems after a few reloadings.
The symptom of loose primer pockets is another issue that is easily resolved, and there is already a case crimping tool that swages the case head tighter against the primer pocket. I haven't seen one of those tools in years, probably because this symptom can also be resolved by trying the following:
1.) Don't ream your primer pockets.
2.) Try a slower burning powder.
3.) Lighten up your load just a bit.