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How often do you need to calibrate bucket

Thought you might suddenly become a 17 once you start poking around

They come with a range of adapters mine goes up to 50 cal if thats your size :)

It goes in the muzzle end of rifle and has what kind of looks like half a scope on it when you look through scope you can see a grid that you adjust scope to. Some people seem to have a knack of bore...

Waste of time. I use a colometer and that gets it pretty close but still need to shoot it to fine tune it.