The Firing Line Forums - View Single Post - Chrony F1 Reads .357 mag/ 38 special but not .45 ACP

Cascade1911 · April 30, 2011, 06:30 PM

(I posted this question in a another thread but it was getting lost in the original post)

I bought an F1 a few weeks ago and today is the first chance I had to try it out.

Bottom line is my f1 reads 38 specials and .357 magnums but not .45 ACP.

I set up, lined up the unit with the target and fired a .45 acp 230 gr LRN pushed by 4.7 grains of Bullseye. Got a "Error 1" which means the front sensor is not seeing the bullet but the back sensor is. So I tried changing alignment, height, increased distance and tried without the sky screens. After about six shots I got a reading (809.7 fps) and finally another after another 10. So I figured I'd switch to 38 special wad cutter rounds until I figure this thing out. First .38 got a reading and only had one error out of about 60 rounds including light wadcutters running 800 fps and .357 magnums running 1300 fps. So figured I'd switch back to the .45 ACP. The F1 would not read a single round out of ten. Now I'm thinking shadows might be giving me trouble. Switched to the .357, F1 read the first shot. Immediately switched to the 45 and "error1" holding same place on same target. Switched back to .357 and the F1 worked fine. What gives?

April 30, 2011, 06:30 PM	#1
Cascade1911 Senior Member Join Date: February 27, 2011 Location: Dutchess County, NY Posts: 450	Chrony F1 Reads .357 mag/ 38 special but not .45 ACP (I posted this question in a another thread but it was getting lost in the original post) I bought an F1 a few weeks ago and today is the first chance I had to try it out. Bottom line is my f1 reads 38 specials and .357 magnums but not .45 ACP. I set up, lined up the unit with the target and fired a .45 acp 230 gr LRN pushed by 4.7 grains of Bullseye. Got a "Error 1" which means the front sensor is not seeing the bullet but the back sensor is. So I tried changing alignment, height, increased distance and tried without the sky screens. After about six shots I got a reading (809.7 fps) and finally another after another 10. So I figured I'd switch to 38 special wad cutter rounds until I figure this thing out. First .38 got a reading and only had one error out of about 60 rounds including light wadcutters running 800 fps and .357 magnums running 1300 fps. So figured I'd switch back to the .45 ACP. The F1 would not read a single round out of ten. Now I'm thinking shadows might be giving me trouble. Switched to the .357, F1 read the first shot. Immediately switched to the 45 and "error1" holding same place on same target. Switched back to .357 and the F1 worked fine. What gives?