Your drawing of the change to the barrel is correct. It is sort of like the feedramps on an M4, they changed the angles and not the depth.
Im working on my AK grips this weekend, if I get that done, and the list of honey do's then maybe, just maybe I can work on this!!!
I will take your advise and do a little at a time... I need to find some cheap surplus ammo for CHEAP!!! Im getting low on ammo as it is, and I may just use this OTM (Hollow point) ammo in my Rem700 and see how it shoots, its only about 50 rounds left.