They are machined but not swaged- its some sort of design process he had patents on, but its not swaged. somehow that hollow area is machined behind it
I shot them out of a 26" barrel at 3,000 but I had more to go- I just found a good node right there so I stuck with it. I think you could get 3100 pretty easy with 4831 SC, maybe more depending on what youre shooting for brass
I myself typically run a G7 also but I didnt have a starting point on the G7- I only had the information for the G1 and so thats what I stuck with is the only reason
I think you would be fine with a 3.850 CIP length magazine in that KRG bravo. I have some 7mm brass at home I could load up a dummy round tonight and give you a length. They wouldnt work in my 7mm because its a ruger 77 with a long feed ramp and a short box magazine- chamber length i had plenty...