I've got about 30-40 shots with the new Kleenbores. I got to say they tightened up my groups and I have less fouling in the barrel. Before with the winchester 209's for shot gun primer I had 4-6" groups at 100 yds. I dropped down to 2" groups with just changing the primer. I was going to try the 25 acp's but the Rem works. I shoot 100 gr. 777 pellets with a 250 shockwave. I felt comfertable to shoot milk jugs at 200 yds. Aimed at the top and over 6" for wind and watch them explode... now that was fun!