When an AR bolt is dropped, (and it needs to be dropped, not eased shut, to make sure it goes into battery)
I have only one AR slamfire with brass WSR and that was in the standing stage. I dropped the bolt and took a divot out of the grass less than ten feet in front of me.
Scared the heck out of the shooters around me.
My scorer, a several times President's 100 placer, just laughed at me. There is a reason I have the knickname "slamfire" .
Then he shot his standing relay. And what do you know, his AR slamfired too!
He blamed me, essentially saying my bad Karma caused his slamfire.
I was using brass WSR and I seat all primers with a Lee tool. Each and every rifle primer I seat in ammo is visually examined. So I know the primer was not high.
His primers were Federal. Federal is proud to tell you that they are the most sensisitive on the market.
A shooting bud of mine, was at Perry shooting standing. Near him on his right was a Junior who, in his opinion, was handling his rifle in a dangerous manner. I suspect the kid was loading the chamber with the rifle up high, parallel to the firing line, and then probably released the bolt with the muzzle sweeping the firing line. I have seen folks do this.
Junior reloads one round and drops the bolt. The AR slamfires and the bullet takes a divot out of the ground, passing just below the elbow of my friend
Junior and friend were scared, but Junior was not removed from the firing line.
Now days, if you shoot through your shooting stool, or take a divot out within ?ten feet? of the firing line, you are removed from the firing line.
This is because of the number of slamfire incidents in the AR.
I have changed my loading procedure standing. Yes, I drop the round in the chamber, but I lower the bolt half way with the charging handle, and then let go. I also bumb the forward release. To date, no new slamfires standing.
In the rapid fire stages I single load the magazine with the sighter rounds. No slamfires in sitting or prone.
I am hosed prone long range. When you are twisted up in that sling, and I am not the rubber man from the Circus, well I toss the round at the chamber and hit the bolt release.
And I am also using CCI#41's at long range.