Lube
After you patch the bullet you need to lube it. Lee Liquid Alox has a side benefit for patches, it affords a degree of water repellency that other lubes might not. I lube with Lyman Moly sitck, but on my hunting loads, I rub some Alox on the exposed patch for some protection against the elements. As far as the bore butter goes, I don't think it would have any affect on accuracy, but unless shooting black powder I also don't see any benefit. If you want to patch the 500 grainers, you won't need a gas check. Patch them and shoot them, the patch protects the base of the bullet. I use 16 lb college ruled paper for my patches and it works mighty fine. When I've shot up my last batch of patched bullets and get around to casting some more, I'll use the 9 lb onion skin Kragman sent me and try it out.
After you patch the bullet you need to lube it. Lee Liquid Alox has a side benefit for patches, it affords a degree of water repellency that other lubes might not. I lube with Lyman Moly sitck, but on my hunting loads, I rub some Alox on the exposed patch for some protection against the elements. As far as the bore butter goes, I don't think it would have any affect on accuracy, but unless shooting black powder I also don't see any benefit. If you want to patch the 500 grainers, you won't need a gas check. Patch them and shoot them, the patch protects the base of the bullet. I use 16 lb college ruled paper for my patches and it works mighty fine. When I've shot up my last batch of patched bullets and get around to casting some more, I'll use the 9 lb onion skin Kragman sent me and try it out.