Given a constant temp and just using a .277" 130gr SST with a MV of 3250 the difference in drop at 500yds. from sea level to 5000ft is -1.7", at 10,000ft it is -4.2", at 15,000ft it is -5.6".
Like I said it can be otehr factors but I"m off more than what your charts show, repeatably over a number of years. Is it altitude only? Probably not, but in one way its not to be ignored that lightly.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
