When I was shooting highpower silhouette, alot of my friends shot 7/08's and I dont remember anyone ever losing a ram with the 168 gr sierra bullet at a piddling 2300fps. I remember several of them shot that same load, it was 38 gr of IMR 4350. It seems to me that all you would get for your rechamber job is a little more recoil. The improved chamber might be a fun project, but strictly for a silhouette gun I dont think it would offer any advantage. For hunting, you might see a substantial velocity increase though. I had a 257Ackely that would literally walk on any 2506 I ever saw as far as maximum attainable velocities. Have fun and good luck.