Re: Removing lead build up in barrel
Many years ago I had leading problem even at the recommended 1000 FPS max velocity. I found the then new Rainier plated bullet.
Jacketed bullets use a soft lead core swaged into a gilding metal (copper alloy) cup and formed under pressure. Cast bullet are from molten lead in a mold and later forced through a die to size them. Cast bullet hardness is controlled by the alloying metals added to the mix (Antimony and Tin in various proportions). Swaged bullet are made of soft lead by forcing soft lead wire pieces through a die. Plated bullets are cast or swaged bullets flash plated (thin coating) with copper. Today there is not only Rainier but Berry's bullets too.
The pricing from the bottom up is: cast, swaged, plated, and jacketed. Plated bullets minimize leading but if you drive them too hard you will still get leading. Shoot them at cast bullet load levels (or a bit faster) and the bore will not lead up. Full loads are best made of jacketed bullets.