I had a M7 chambered for 7SAUM from 308 last year, the smith put a flat follower and different box in it and it wouldn't hold any shells so I put the 308 follower and box back in with the bent in sides at the top of the bow straightened out it will hold one and sometimes 2 shells in when I open the bolt. It hasn't worried me until now as I have been single feeding it but want to do some stalking soon aswell. Can anyone tell me how to get it to hold shells?, I have read on here about a single stack mag, will this fix it? how do I do it or where to buy the gear from?. Thanks for any help.