go to remington.com and find the remingotn shoot ballistics program. i use it and it seems to be pretty accurate. you can pic and weight bullet and style that they make in that weight. you can type in a sight in yardage and a zero yardage, for example my 7mm mag would nee to be sighted in a little under a half inch low at fifty yrd to be zeroed at 100 yrd. and dead on at fifty will hit dead on again at 150. its a useful program.