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Chornograph shenanigans

nemesisenforcernemesisenforcer Member Posts: 10,513 ✭✭✭
Took the chronograph out today to do some testing and got some bizarre results.

It was all 44 magnum loads shot out of 1 revolver: my S&W 629 with 6 inch factory ported barrel, all bullets 240 grain cast semi wadcutter, all primers CCI large pistol. Only powders and charges changed

Chronograph: Caldwell Ballistic Precision chronograph placed approximately 6-8 feet from muzzle of pistol.

Results (all figures the average of 4 or 5 shots):

.7cc Unique: 1382 fps

1.0cc Unique: 1366 fps

.7cc Autocomp: 1376 fps

1.3cc IMR 4227: 1380 fps

1.6cc IMR 4227: 1387 fps

as you can see, not only are the velocities remarkably similar and consistent, but they're incredibly high, especially for the lighter charges. I'm sure that something is wrong. I've never seen anything like this before.



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