Mounted the scope on a Remington 700 .270. It was a tight fit and rear sight had to be removed or reversed. I chose to reverse it as it may be needed if the scope becomes useless for some reason. The 50mm objective rendered the "see through" mount unusable except for the necessary extra elevation from the receiver. Sighted in at 50 yds, which put the point of impact + or - 1.0" of line of sight from 25 yds. to 234 yds. Beyond that, the BDC will be used for confident shots up to 400 yds. However, shots like that are very unlikely here in the northeast. I also downloaded the supporting Spot On application to my iPhone. Only thing left to do is find a trophy buck, in season of course. Nice bright optics adjusted easily for my ageing eyesight. Sighted in easily, adjustments operated as stated, removed the scope and sighted in the iron sights, then replaced the scope to find is was still sighted in. Only time will tell how well the scope holds the sight-in through transportation, hunting and occasional trips to the range. Overall, a great scope value.