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Old September 14, 2009, 07:56 PM   #13
Northslope Nimrod
Senior Member
Join Date: November 23, 2004
Posts: 462
OK, help me out. I'm not very good at ballistics.

When I use Norma Ballistic Calculator, I get the same trajectory for 165 gr at 2700 fps as I do for 180 at 2700 fps. Is that right? The energy changes but the bullet drop stays the same even out past 550 yards.

So is it a "rules of gravity thing"? An object will fall at the same rate of speed despite its weight? Only wind resistance would affect it? I didn't include any wind speed in the calculation.

So can I use my Hornady 165's and 180's without re-sighting since my muzzle velocity on both is 2700? (not target work...just plugging elk at...usually less than 100 yards but could be out to 250 yards)
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