One of the Good Guys on another thread asked me to compare the down-range performance of his .243 Winchester load and a typical .220 Howell load. (That other thread was on another subject, somewhat less interesting.)

It occurred to me that some of my other good buddies here may be interested in the same data, so here they are.

bullets .220 Howell, 75-grain A-Max .243 Winchester, 70-grain Sierra
barrel lengths 26 in.
zero (both rifles) 295 yd
BC .224 A-Max, 0.440 .243 Sierra 0.259

velocity at muzzle .220 Howell, 3,600 ft/sec .243 Winchester, 3,620 ft/sec
velocity at 100 yd .220 Howell, 3,350 ft/sec .243 Winchester, 3,205 ft/sec
velocity at 200 yd .220 Howell, 3,120 ft/sec .243 Winchester, 2,830 ft/sec
velocity at 300 yd .220 Howell, 2,900 ft/sec .243 Winchester, 2,480 ft/sec
velocity at 400 yd .220 Howell, 2,690 ft/sec .243 Winchester, 2,160 ft/sec
velocity at 500 yd .220 Howell, 2,485 ft/sec .243 Winchester, 1,860 ft/sec

bullet path at 100 yd .220 Howell, 2.1 in. .243 Winchester, 2.5 in.
bullet path at 200 yd .220 Howell, 2.7 in. .243 Winchester, 3.3 in.
bullet path at 300 yd .220 Howell, - 0.25 in. .243 Winchester, - 0.3 in.
bullet path at 400 yd .220 Howell, - 7.3 in. .243 Winchester, - 9.6 in.
bullet path at 500 yd .220 Howell, - 19.2 in. .243 Winchester, - 25.4 in.

wind deflection at 100 yd .220 Howell, 0.55 in. .243 Winchester, 0.9 in. (10-mi/hr wind)
wind deflection at 200 yd .220 Howell, 2.2 in. .243 Winchester, 4 in.
wind deflection at 300 yd .220 Howell, 5.1 in. .243 Winchester, 9 in.
wind deflection at 400 yd .220 Howell, 9.4 in. .243 Winchester, 17.5 in.
wind deflection at 500 yd .220 Howell, 15.2 in. .243 Winchester, 29 in.

Unless I've typed-in a typo, these figures should be a heck of a lot more accurate than either of us can tell by shooting these rifles.

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