linoww
posted this
01 August 2008
This would be a good subject for some well designed testing to determine if and when jacketed fouling affects cast bullet accuracy and is so how much. Joe Brennan where are you when we need you?
John
Funny<G>
I wish i had the time to do it,but i couldn't afford the jacketed bullets!!
Kind of like Al Millers “lube but don't size"article in Handloder years back.People still repeat that as “Gospel" I always felt his data was rather skewed to his opinion.I think Dave Scovill (or another dime store gunrag expert) said to figure 1” at 100 larger group size for each .001 sized!!I size as little as possible,but if done uniformly i cant see the harm down to at least 1.5 MOA.Now if you count bumping as sizing all goes out the door because bumping can improve accuracy.I have had it hurt accuracy if the die is not closely matched to the throat and overdone.
Still i would prefer a clean copper free bore,but have shot cast in my 22-250 Savage 12 down to 1/2” at 100 with visible fouling that was in it when I bought it.De-coppering it did nothing either way as far a accuracy was concerned.it just took 20-30 shots to get it to settle down after the deep cleaning.
I thnk jhalcott has it right about it not always being a factor,but when it is its not a total disaster.But in a ultra heavy copperd bore i bet it could be.
George
"if it was easy we'd let women do it" don't tell my wife I said that!