My gun has a 26" barrel plus the brake. I have gotten 2330 ft/sec, but I will have to check the load, not at home right now. You should get about 1900 to 1950 ft/sec with the 155 grains of 4350 and a 20" bl. I believe my hot load so far at 2330 ft/sec was with 165 grains of 4350. I have some loaded with vihitouri N165 I think. I got about 2200 or 2220ft/sec with it. I will have to check when I get home.