Gentlemen, and I use that term loosely .... 
Coming from airguns, there is considerable muzzle blast when you push a pellet down range with 3,331PSI of air pressure behind it ... as a matter of fact, you can seriously injure a person with the muzzle blast and no pellet. Anyway, when I would chrony, placing the chronograph about 3 feet in front of the barrel, I had no effects on the readings from the muzzle blast.
Is this a good distance away for .223?
Thanks;
Pgh Pappy

Coming from airguns, there is considerable muzzle blast when you push a pellet down range with 3,331PSI of air pressure behind it ... as a matter of fact, you can seriously injure a person with the muzzle blast and no pellet. Anyway, when I would chrony, placing the chronograph about 3 feet in front of the barrel, I had no effects on the readings from the muzzle blast.
Is this a good distance away for .223?
Thanks;
Pgh Pappy