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Ok I got a rifle from my grandpa that was home made and was wondering how to find out what the twist is. The only thing that is stamped on the barrel is .308 HGW. I found the guy that put the gun together and he doesn't know the twist either. All he said was the barrel is a mg42 spare barrel...

Ok i'm just starting out and i use a .308 with a 21 inch barrel. I want to be able to make 500 plus yard shots but 500 will do for now. I was wondering how to do the appropriate math for figureing out how to adjust my scope to hit my mark. My scope is 4-16x40mm and has 1/4" MOA at 100 yards. I...