svartkruttgris#369
Frequent Elocutionist
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Posts: 2980
Location: Colorado, Norway, Sweden
Joined: Oct 28 th, 2014
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Re: Blow Tube - Barrel Wipe question
Reply #28 - Apr 3rd, 2016 at 7:26pm
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Wayne, I agree that temp and humidity can play decisive roles with BP loads. My lifelong standard for BP loads is different than what most BPCR shooteers use. I almost never wipe or blow tube between shots and do not want to. I do wipe out nearly all powder fouling after each 15 shots of a BPCR relay (1 fouler, 4 sighters, 10 for score). Being a slow old guy I need all the time to concentrate on shooting. I am not a long time BPCR shooter even though I have been using small grouping BP loads since a teenager for hunting. My goal is for group size to remain constant for at least 15 shots, no matter if cool and wet, hot and wet or hot and dry. After 1 fouler my groups are consistant for at least following 14 shots (that does not mean I never let off a bad shot). I accepetence test loads for 10 shots, no messing with bore. Sometimes my best shots are late in 10-shot string, when I finally get my act together (I have more contrary body parts than just shoulder). My best loads have maintained group size/score on steel critters even at 90+F and less than 15% humidity -- with NO HARD FOULING in bore. One of my best grouping loads with Lyman Snover 410663 used 60 gr Swiss FF, 2 0,060" wads, 0,25" compression, bullet slightly pushed into rifling. Muzzle velocity about 1290 fps in 20C at 5000feet, less than 50% humidity. It is very clean burning in my rifle. I quit using it because my mangled shoulder did not do well with even 15 shots in row. Going to loads mangled shoulder does tolerate -- at least last year -- resulted in 1100 or so FPS with same bullet and about 50gr Swiss 1,5F, and, of course, a multi-wad column to bring bullet into snug fit into rifling. All this in Starline or reformed Win brass. Same basic load with Saeco 640 is at least as good, perhaps better grouping. Putting Lyman 300 grainer for .405Win in top -- not touching rifling -- gives larger groups, but chickens never complain. Hope to try RCBS 300 grainer this year for pigs, maybe turks. My basic, underlying requirement is same as for wipers and blowers -- uniform bore conditions from shot. Difference is that I build that into load itself. NONE of these loads are even close to acceptable with any Goex powder, even the highly touted Old E. They develop hard powder fouling in less than 10 shots, powder fouling I never could remove in time available between relays. BAD misses!! Grisen
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