How would my 270 do if I loaded it with 90gr bullets? It would be for shots over 300 yards.
Well, it would sure kick more than a .243.
Ballistic coefficient on the 90's isn't too great. According to my software, with a 250 yard zero, a 90gr Sierra HP at 3,500fps would drop 16" and drift 37" in a 15mph wind at 400 yards. A 130gr Sierra Matchking at 3100fps would hit 14" low and drift 13" in a 15mph wind.
Speer lists a much better BC for their 90gr than Sierra does. If that number is to be believed, it would only drop 13" and drift 24". Mitch.