Was thinking about getting one. I would like to carry at least 10 extra rounds and carry on the inside of the pack, from what I could find it sounds like the rear of the pack tapers from 3 3/4" to 3" at the front? I'm shooting a 7 ultra and oal is just under 3 3/4" so my concern was am I only going to be able to fit a few cartridges on the inside. I was going to get the modular pack so I could maybe fit as many as I could on the inside and the rest outside if I have too I guess? Does anyone have one or can help me out I'd appreciate it. Thanks. Oh also its a thumbhole stock will it still work???