How far are you planning on shooting? There are certainly some ammo that will be really close at 100. Example is my 7SAUM, I shoot the accubond 140's through it. I loaded some 160 matchkings and they were only an inch low, at 100 yards, no big deal. But you take that same comparison out to like 300 or 400 they are at least going to be 3 or 4 inches off, and I would bet more do to weight change, BC difference etc. If it were me in this pinch, I would go to a store and buy 1 or 2 types of 165's and go try them. They should be pretty close, and while I was there you should be able to get it sited in in just a couple shots.
