I'd like some ideas and advice.
I own a Lyman Great Plains 50 cal. with the slow twist barrel. Every patch material and ball combination I use leads to shredded patches. I've used loads of 50-100 gr. of 2F, 3F, Pyrodex, and 777 with the same results.
I suspected damage on loading, but 'blowing out' a loaded charge shows pristine patches.
Lubes of different types seem to make no difference.
I can't detect any tight or loose spots in the barrel by the feel of the rod.
This barrel has about 500-600 rounds through it.
Accuracy is in the 3" at 50 yds range, but I expected it to do better. (My old, cheap, Traditions would do that at 100 yds until I wore her out!)
Thanks for your ideas.
Doug