For those of you following my threads regarding ballistic coefficient testing (primarily on.25 cal and.30 cal pellets, through polygon (.25 cal) and LW rifled (.25 &.30 cal) barrels), some of you may have read that I’ve gone ahead and purchased a second chronograph to complete testing more efficiently, and perhaps more accurately (since the BC for a single pellet can be measured directly). So after a long wait for my new chrony to arrive (the Caldwell Ballistic Precision Premium Kit), I finally set off to begin calibrating the two chronographs to each other so I know how much to offset the readings from one to match the other, so I can accurately start using them both to test BC’s as I intend. I’ve decided to share the data here along with a few of my observations to provide a service to the community, and because I see a few things in the data that I didn’t anticipate-and lastly because I’m not totally convinced I have the correct ‘offset’ number between the two chronies to use moving forward (your assistance is welcome)Method:To start off with, I decided to position the first chrony in my standard (1 yard) position, and the second one a set distance behind it (18″, measured center of rear window to center of rear window).

The first chrony was positioned so that the ‘rear’ sensor window measured 36″ from the end of my moderator. The second unit measured an additional 18″ behind the first (or 1.5 yards from the end of the moderator). From there, I emptied 1 full.25 caliber magazine (shooting JSB Heavy, Mk I pellets) across both chronographs, recording the data, shot by shot, from both of them (later downloading into a spreadsheet for comparison).The first magazine full was shot with the Caldwell unit at 1 yard, and the Shooting Chrony unit at 1.5 yards. For those of you following my threads regarding ballistic coefficient testing (primarily on.25 cal and.30 cal pellets, through polygon (.25 cal) and LW rifled (.25 &.30 cal) barrels), some of you may have read that I've gone ahead and purchased a second chronograph to complete testing more efficiently, and perhaps more accurately (since the BC for a single pellet can be measured directly). So after a long wait for my new chrony to arrive (the Caldwell Ballistic Precision Premium Kit), I finally set off to begin calibrating the two chronographs to each other so I know how much to offset the readings from one to match the other, so I can accurately start using them both to test BC's as I intend.

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I've decided to share the data here along with a few of my observations to provide a service to the community, and because I see a few things in the data that I didn't anticipate-and lastly because I'm not totally convinced I have the correct 'offset' number between the two chronies to use moving forward (your assistance is welcome).Method:To start off with, I decided to position the first chrony in my standard (1 yard) position, and the second one a set distance behind it (18', measured center of rear window to center of rear window). The first chrony was positioned so that the 'rear' sensor window measured 36' from the end of my moderator. The second unit measured an additional 18' behind the first (or 1.5 yards from the end of the moderator). From there, I emptied 1 full.25 caliber magazine (shooting JSB Heavy, Mk I pellets) across both chronographs, recording the data, shot by shot, from both of them (later downloading into a spreadsheet for comparison).The first magazine full was shot with the Caldwell unit at 1 yard, and the Shooting Chrony unit at 1.5 yards. Thanks for the reply and note regarding the Caldwell recommendation.

One thing about that recommendation: that is (I believe) for firearms with a muzzle velocity near 3000 fps-which makes sense that, at that speed, it may take longer (distance wise) to be fully stabilized. Regarding getting more accurate readings by moving further from the muzzle: the app allows you to plug in the BC and how far away you are from the muzzle, and then back calculates what your muzzle velocity is from there-so that makes sense to me having now used it for a session.I’m guessing the ‘8 yards’ can be scaled based on the ratio of velocities of the projectile (because it also says a ‘minimum of one arrow length’ for archery, which flies in the 300 fps range).

So using my guess of 3000 fps and scaling that back to about 880 fps, would yield about 2.35 yards for an airgun-that may very well be a good place to put the first chronographSean. Thanks for the reply and note regarding the Caldwell recommendation. One thing about that recommendation: that is (I believe) for firearms with a muzzle velocity near 3000 fps-which makes sense that, at that speed, it may take longer (distance wise) to be fully stabilized. Regarding getting more accurate readings by moving further from the muzzle: the app allows you to plug in the BC and how far away you are from the muzzle, and then back calculates what your muzzle velocity is from there-so that makes sense to me having now used it for a session.I'm guessing the '8 yards' can be scaled based on the ratio of velocities of the projectile (because it also says a 'minimum of one arrow length' for archery, which flies in the 300 fps range).

So using my guess of 3000 fps and scaling that back to about 880 fps, would yield about 2.35 yards for an airgun-that may very well be a good place to put the first chronograph.Sean. One more comment regarding pellet stabilization vs. One more comment regarding pellet stabilization vs.