Wreck-n-Crew
Member
This post could be made a part of reloading section since i only shoot my loads but im not sure what is going on so i thought i would start by process of elimination.
Some background on the ar15:
Anderson Lower. Everything else is AR Stoner including the LPK. I built the lower but the current upper was preassembled from AR Stoner. It has a medium contour pistol length gas system 300 Blackout barrel. Free float Handguard(7").
I built this Ar15 almost 2 years ago and it started out as a 223 With more than 650 flawless rounds. I recently switched to 300 blackout. I form my own brass from selected and qualifying 223 brass to make my 300 blackout brass.
My first 30 blackout loads went flawless through the gun. I Use CFE black powder so no over charge possible. Bullet are 168gr Hornady AMax. Primers are Federal Small Rifle primers. The primer pockets had the military crimp removed prior to hand priming and inspection for full seating, so no raised primers.
The second batch of 80 rounds is where the issue of double fires began.
Double fires happen with trigger remaining at the rear without letting it up. So its not one pull fire and one release fire.
The brass inspection is very interesting because the second case has a raised primer and the firing pin mark looks light as if a slam fire. Again it is almost impossible for there to be an overcharge as i weighed and checked each charge on two scales and the charge is a compressed charge, and listed pressure is 14, 000 psi below max pressure for the cartridge. This is why i chose this powder.
I have checked the disconnecter, hammer, sear visually and it is not visibly worn. I have done the checks with the lower off to see if hammer follows and after hundreds of tries manually i cannot get it to fail.
I plan to load a few different rounds with a different pri.er brand and retest but at this point.i feel like something mechanical is causing it.
My main question is what can cause this that i haven't eliminated? But any suggestions are welcome. Just so puzzled here...
Some background on the ar15:
Anderson Lower. Everything else is AR Stoner including the LPK. I built the lower but the current upper was preassembled from AR Stoner. It has a medium contour pistol length gas system 300 Blackout barrel. Free float Handguard(7").
I built this Ar15 almost 2 years ago and it started out as a 223 With more than 650 flawless rounds. I recently switched to 300 blackout. I form my own brass from selected and qualifying 223 brass to make my 300 blackout brass.
My first 30 blackout loads went flawless through the gun. I Use CFE black powder so no over charge possible. Bullet are 168gr Hornady AMax. Primers are Federal Small Rifle primers. The primer pockets had the military crimp removed prior to hand priming and inspection for full seating, so no raised primers.
The second batch of 80 rounds is where the issue of double fires began.
Double fires happen with trigger remaining at the rear without letting it up. So its not one pull fire and one release fire.
The brass inspection is very interesting because the second case has a raised primer and the firing pin mark looks light as if a slam fire. Again it is almost impossible for there to be an overcharge as i weighed and checked each charge on two scales and the charge is a compressed charge, and listed pressure is 14, 000 psi below max pressure for the cartridge. This is why i chose this powder.
I have checked the disconnecter, hammer, sear visually and it is not visibly worn. I have done the checks with the lower off to see if hammer follows and after hundreds of tries manually i cannot get it to fail.
I plan to load a few different rounds with a different pri.er brand and retest but at this point.i feel like something mechanical is causing it.
My main question is what can cause this that i haven't eliminated? But any suggestions are welcome. Just so puzzled here...
