My no.1 is in .416 Rigby. I've only shot it off-hand at about 75 yards. Every now and then I get the urge to put a scope on it. Seems what would be normal would be a 1.5-2X. These seem also to be the most expensive.....a costly gamble. Seems, also, open sights would be faster to come on target at closer ranges to which the .416 seems best suited. Wonder too what would be the cheapest scope that would hold up for a 'test'. Opinions, advice, experiences welcomed! Bill