I've had a .40 SMR for several years now, have put approx. 2000 rnds through it, great rifle...I use Hornady .395 r.b, 25-30 gr. of Swiss 3f @ 25 & 50 yds., 40-45 gr. @ 100yds.patching material is called utility cloth , I purchase that from Jo-Ann fabric stores, it is approx. 0.16-0.18 thick. My...