Re: How many rounds can you shoot before accuracy fades?
I will reduce the number of shots in a string after I have fire formed the new cases. I will clean out the bore after each session and take note how the groupings hold together during each outting. I have a few cans of gunslick foam boar cleaner that I can use to eliminate most if not all copper fowling. The first time I used it in the 375 jdj barrel, the foam was squirting out from the breach. It got pretty messy. But, I do have a casing that I crushed when I was first adjusting my die to form the 375 from its parent 444 marlin case. I can drill a hole thru the base where the primer seats into so the tube from the boar cleaner fits snug and cut the top half off the cartridge and toss it away. Now, mind you that I'm not reccomending anyone attempt this procedure. If any of you are familiar with the Thompson center, you know it's a break open action where you can remove the barrel completely and I presume that this modified case will work for which it is intended in my bore cleaning efforts.
That being said, I will also increase the time between shots to minimize the heat distortion. Elimination of many variables which can give false accuracy tests is the goal in the production of a quality load.