One of my trapdoors displays terrible accuracy even with .458 (off the shelf)bullets. I slugged the bore, and the slug came out to .462 on the lands. Bullets occasionall keyhole at ranges as short as 40 paces or so.

The problem is, its also one of my nicest guns, with strong blueing and case colors....I dont want to get rid of it. My preference would not be to have a custom bullet mold made and get into casting if I can avoid it....has anyone ever tried dishing out the back of hard cast bullets to get them to grip an oversize bore better? I have a lathe to do this accurately with but wanted to see if anyone had had tried it. Obviously this would alter the weight of the 450-500 gr. solids I normally use.
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