Last century, Bill Maple adjusted the point of impact on a friends Winchester M12 trap. He gave Bill the gun but said he didn't want to watch the process. It worked.
Saw a gunsmith take a big hogging rasp to the comb of a Beretta once at the US Nationals. GORGEOUS wood, wasn't an off the shelf Cabela's Beretta. Got it where he needed, stuck a piece of packing tape over the top and told the shooter to send it to him when the tournament was done and he'd finish it properly.
The sound of those first 4 strokes made everyone wince at once. Just HARD to watch lol. Gunsmith said it takes about 100 times doing that to feel comfortable you're not messing up a 5 figure priced stock.
