I had something strange happen to me today while at the range. Shooting my .223 Handi Rifle at 100 yards, checking out some new reload recipes. I normally shoot this rifle using a bi-pod. It’s handy when you close the action. All you have to do is lift on the rear of the stock and the weight of the rifle closes the action. Well today I tried a sand bag front rest to see if accuracy was any different. On the third or fourth shot off the sand bag, I noticed the muzzle jump was way different then normal. I looked to see where the bullet hit the target, and it was 6 inches lower then the previous shots. I then looked at the rifle, the barrel was not locked into battery. It was partly open, I could see the brass case. I opened the action expecting to see a damaged / blown case, but it was fine. I did notice that the firing pin dent in the primer was on the very outer most edge of the primer. So far off center that I’m very surprised it even ignited. Well needless to say, the bi-pod went back on so I know the action closes. Has this ever happened to anyone else?
On a good note, I found a load that gives consistent 0.8 inch 5 shot groups at 100 yards in my .223 Handi Rifle heavy barrel. 52 grain Hornady A-Max bullets crimped medium with a Lee factory crimp die, 23.0 grains of IMR3031, Federal brass, Remington 7 ½ Bench Rest Primers.
I would imagine if I weigh sorted the brass, I could get it down below 0.7 inches, so maybe I’ll try that someday soon. My goal is 0.5 inch groups, but don’t know if that’s possible without a trigger job.