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

g.willikers · May 7, 2011, 03:44 PM

My old Chrony is very light sensitive.
Some rounds work fine and others don't.
Sometimes, it's the powder used.
If unburned powder is coming out of the barrel, along with the bullet, that can confuse the Chrony.
Maybe your .38s are cleaner burning for one reason or another.
One way to prevent this, if it's the cause, is to shoot through a piece of cardboard, preventing the powder from interfering with the reading.
Standing back farther from the Chrony might change things, too.
Just don't wound it.

May 7, 2011, 03:44 PM	#4
g.willikers Senior Member Join Date: September 28, 2008 Posts: 10,442	My old Chrony is very light sensitive. Some rounds work fine and others don't. Sometimes, it's the powder used. If unburned powder is coming out of the barrel, along with the bullet, that can confuse the Chrony. Maybe your .38s are cleaner burning for one reason or another. One way to prevent this, if it's the cause, is to shoot through a piece of cardboard, preventing the powder from interfering with the reading. Standing back farther from the Chrony might change things, too. Just don't wound it. __________________ Walt Kelly, alias Pogo, sez: “Don't take life so serious, son, it ain't nohow permanent.”