So......made it out of there alive! No problems with the lockup, but several issues with the mags feeding and generally being under gassed.
Ran 60 or 80 rounds of Wolf through it and one box each of Hornady 123 SST and ELD-M. Hated the Wolf, 4-5 MOA..bummer! Both the SST and ELD was around 1-1.5 MOA at 100. Not great but given the circumstances I can work with that. But the under gassing turned into a royal PITA. I grabbed the wrong lower, off a slammy carbine i hardly shoot anymore, and it was way over sprung for the midlength gas sytem and the Grendel. It had a red Sprinco spring and H3 buffer in it. Nada! Wouldn't lock open on the last round, wouldn't pick up another round. It went back just enough to reset the trigger and that was it. Finally figured that out and put another lower on there with a stock spring and buffer and it helped a little but there's still alot of room for improvement. The gas rings on the bolt were really snug in the carrier, so, I suppose things will improve somewhat as they wear in. I'm tempted to open up the gas port but may try a really light buffer spring and buffer first and see what happens.
FWIW: some data points
16" Ballistic Advantage barrel, in an Aero Precision upper, looks like maybe the Hanson profile barrel.
Sea level, 40 F, clocked by Labradar
Wolf 100 grn avg around 2460 fps, ES 81/23 SD
SST 123 grn avg around 2325 fps, ES 58/ 14 SD
ELD_M Black 123 grn avg 2345 fps, ES 39/11 SD
Ran 60 or 80 rounds of Wolf through it and one box each of Hornady 123 SST and ELD-M. Hated the Wolf, 4-5 MOA..bummer! Both the SST and ELD was around 1-1.5 MOA at 100. Not great but given the circumstances I can work with that. But the under gassing turned into a royal PITA. I grabbed the wrong lower, off a slammy carbine i hardly shoot anymore, and it was way over sprung for the midlength gas sytem and the Grendel. It had a red Sprinco spring and H3 buffer in it. Nada! Wouldn't lock open on the last round, wouldn't pick up another round. It went back just enough to reset the trigger and that was it. Finally figured that out and put another lower on there with a stock spring and buffer and it helped a little but there's still alot of room for improvement. The gas rings on the bolt were really snug in the carrier, so, I suppose things will improve somewhat as they wear in. I'm tempted to open up the gas port but may try a really light buffer spring and buffer first and see what happens.
FWIW: some data points
16" Ballistic Advantage barrel, in an Aero Precision upper, looks like maybe the Hanson profile barrel.
Sea level, 40 F, clocked by Labradar
Wolf 100 grn avg around 2460 fps, ES 81/23 SD
SST 123 grn avg around 2325 fps, ES 58/ 14 SD
ELD_M Black 123 grn avg 2345 fps, ES 39/11 SD
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