When you say you've slugged the bore, what method have you used?
If you are putting the calipers across the 5 groove rifling impressions you will be getting a larger diameter than it actually is. There is a way of doing it with V-blocks but for sizing for cast you need an accurate throat diameter.
I use the pounded or impact slug method described below, taken from the Cast Boolits archive.
Another alternative (prefered by 45 2.1) is a pounded slug. One fills a fired case with a hard lead alloy leaving just a little of the neck empty, and then drives a soft lead slug into the lead/case/throad area. Using a brass rod of near bore dimensions if the best driving road. There are other ways to get the same pounded slug, but this is the way that worked best for me. Lube the bore and outside of the case and use a heavy hammer to pound the slug into shape. there is no shrinkage doing it this way.
already put slug down the chamber into the rifle , its 2 band , then remove slug i measured the two bands that were stcking out ...and got the reading of ,318
Last edited by gtpkeeper; 31-08-2017 at 11:28 PM.
ballkeeper
email...... stephenbarrow@ntlworld.com
I'm done with casting lead bullets , done way too much , I buy bullets for my 303 from dodgyrog sized exactly to my bore , my bore is 313" and in good condition so I buy .314 bullets . Don't shoot lead bullets after jacketed without de-coppering the bore scrupulously , if you fail to do this any groups you achieve will be of the shotgun variety.
This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future! Adolph Hitler – 1933
cheers guys for your help,
whats best for removing copper then
ballkeeper
I use Boretech Cu+2
This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future! Adolph Hitler – 1933
Quickest is clean shot with the accelerator but long term if you can store the rifle horizontal is C2R
I also like k12 too
Patch bore first with brake cleaner to remove carbon
email...... stephenbarrow@ntlworld.com