I have been using IMR 4227 since the 60's in handguns and a K-Hornet rifle with full loads and nary a problem. More recently, past five years or so, I have been using it in my 7.62 Israelie K-98, which has a pristine bore, to shoot the military matches. It has shot and continues to shoot some fine groups.
The load is 16 grns. behind the RCBS 30-165-Sil bullet which drops from the mold at 178 grns. However, this summer I began to notice a hard ring of fouling in the bore about three inches ahead of the chamber after about ten or twelve rounds. A few swipes with a copper brush and bore sovent takes the ring out and we are back in business again.
The only thing that I changed was, before this summer, I was loading 17 grns behind a heavier cast bullet, the RCBS 30-180-SP which came out at about 190 grns.
Seems to me that some where in my foggy memory I remember reading about 4227 and fouling. but the strange thing is that i have never had this happen in this Mauser before after many many rounds of cast and 4227 through it.
The powder is from a stash that came in the old blue cans. Shoots good yet though.
Anyone notice something like this while using 4227? Pressure not high enough?
