I have taken 2 sheep at 509 and 550 ydsthe first a dall the second a stone in 30 mile cross wind .I missed first shot with aid of guide and spotting scope he told me I was 12 inches in front of hi body.my next shot was dead behind the shouldeer was not even holding on the sheep.wind drift was estimated at 35.inches.I am luck to have 1000 yd rande in my back yard.I have never killed any thing with double rifle over 80 yds.a rule of thumb is 3 inches high at 100yds is the seed of bullet less last numberlie 3150 would be 315 yds.