1885 Browning Low wall .45 Colt 24" Barrel using Semi Buck horn Sights @ 50 yard Target. Bought the gun used, but it seemed to have been unfired. I've only put about 50 rnds thru it so far.
I've shot these loads while prone off a sand bag and these are my baffling results...
1. American Eagle 225 Grain jacketed bullet @ 863 FPS is hitting the target dead center @ 50 yards with rear sight ramp at mid point
2. 250 gr. cast HSM Cowboy loads (fps unknown but slow) are hitting 8" low
3. 325gr. Hard cast HSM Bear loads @ 1150fps are hitting 10" low
4. 325 gr. Hard cast Buffalo Bore @ 1325fps are hitting 12" low
With the big hot loads I don't think my rear sight ramp could put these loads on paper at 50 yards. I would have thought the bigger faster bullets would have hit higher than the lighter slow bullets, but the total opposite is happening in the extreme!
My only two theories so far are:
1. the slow bullet is leaving the barrel during maximum muzzle jump, the fast ones are leaving before it?
2. the Hard cast bullets aren't correctly engaging the rifling and are falling out of the sky?
Anyone have any insight into this?
Thanks