Q:During a recent gun bull session at our local shooting range thefollowing statement was made.” A 110gn 270 bullet and a .30calibre 110gn bullet leave the muzzles at 3300 and 3400 fpsrespectively. But at 500 metres, the .30-06 has only half the muzzleenergy of the .270 bullet.” We heard this from a guy whoconsiders himself to be the club expert. However, we now have anongoing argument raging between the .270 and .30-06 advocates. Canyou please give us the facts?
A:The .270 by reason of smaller diameter, has less air resistance thana .30 calibre bullet of equal weight. Assuming the same shape ofpoint and the same weight, the .30 calibre bullet would have 22percent more air resistance than the .270. If your two bullets aresharp-pointed spitzers, the .30 calibre would have 1753 fps and 1051ft/lbs of energy left at 500 metres. At the same range the 110gn .270would have 2203fps and 1186 ft/lb of energy left. Thus the .30calibre would have only about 88 percent of the energy of the .270despite leaving the muzzle 100 foot-seconds faster. Hope that settlesyour argument and stops the boys from murdering each other.