Hello. I would be interested in knowing what you guys use for boresighting a scope for an in-line? The laser ones are expensive, but a good idea - I saw a new one at Cabela's that actually screws into the breech (replaces the plug). The mechanical ones are a lot cheaper but do not always fit muzzleloaders - and what size would you use - i heard the 20guage insert works the best for 50cal? Please advise thanks