Re: Abrasive Bullets
They do work, but only to a certain extent. The one barrel I've used them on is on an 1903-A3 with the original 2-groove barrel, a very rough barrel. The biggest concern I had was with fouling, after 4-5 shots the accuray goes south. After having run the 50 final finish bullets through the barrel, the accuracy has slightly improved (by going from a 1.5" group to about 1" group) Ya Ya I know thats 33 percent (not exactly slightly) but I have a feeling It has more to do with the fouling than anything else. So far I have put through about 20 rounds without cleaning and no noticable amount of fouling, accuracy hasn't fallen off yet.
One thing you might be concerned with is, how far it might push the throat forward, in my case it didn't at all, but then again my barrels rifling takes up about 60 percent of the surface area of the bore. If laid out flat the lands would probably be about .25-.3" wide, and the groves about .1875" wide. Hell it's a battle rifle, meant to be fired continuously for extended periods of time, I have personaly fired 60 rounds through it in less than an hour, there's not much that's gonna hurt this barrel. It was made for abuse.
As for how hot to load them. Not very! The instructions tell you to pick the fastest powder you have for the cartridge and load the lightest load listed in your reloading manual for it.
Over all, I think that they only allowed the full accuracy potential of the barrel to show through a little longer. When it finaly does start fouling accuracy will go south again.