Normally depending on bullet size and harness of bullet, if you stay below 1100-1000 fps your good to go. Some Leading occurs when gas blows by the bullet, that's what it's good to slug you barrel to see what size you need. Mostly .452-.453 are good.
I shoot .356 out of my 9mm, barrel slugs out at .355 last I checked.
I'll shoot a couple of hundred and pull the barrel and check for leading. Just bring a cleaning rod with bore brush wrapped in some choreboy 100% copper scrubbing strings. There in the soap department of Walmart. Several swipes up and down shoot a little Rem oil in the bore swab out and drive on.
Hope this helps
I shoot .356 out of my 9mm, barrel slugs out at .355 last I checked.
I'll shoot a couple of hundred and pull the barrel and check for leading. Just bring a cleaning rod with bore brush wrapped in some choreboy 100% copper scrubbing strings. There in the soap department of Walmart. Several swipes up and down shoot a little Rem oil in the bore swab out and drive on.
Hope this helps