First, my stock of 7 1/2's are about 20 years old, my stock of Fed. 205's are 2 years old. That being said, I usually run side by side tests,10 charges of xyz powder, 5 with 7 1/2's and 5 with 205's. In a 1-9, 26" Savage, there is little difference , in my 1-8 , 20" RRA V, the 7 1/2 will shoot 50 % smaller groups that the 205's . Will the new stock of 7 1/2 do the same, you will just have to test them.Remington 7 1/2 BR primers are actually a small rifle magnum primer. The 6 1/2 is their standard small rifle. They ignite powder like AA2200 and other double base powders much better than standard primers. Remington primers do run hotter than Federal primers but that's just a matter of adjusting and retuning your loads. While I do prefer them in certain applications, I use Federal in most of my match applications.