New to the forum and new to this airgun thing. I wanted to know thoughts on ammo testing, and what procedures everyone uses between different manufacturers. When testing ammo in my rimfires I would always clean the barrel with a boresnake and at least put acouple magazines through it with the ammo to be tested before looking for groups. Just recently purchased a Beeman R9 and have a few sampler ammo packs from H/N and JSB. I cleaned the barrel when I first got the rifle but not between rounds, when going from one brand to another point of impact was all over the place for afew rounds before settling down. Just seeing what some thoughts are, and if cleaning barrel is necessary between manufacturers. Thanks!