04-18-2017, 03:02 AM
Ok i was able to take some COAL on the three factory loadings i have, hornady black 123gr eld, hornady 123gr sst, and wolf 100gr steel case. I took 5 measurements from 5 rounds of each.
ELD: 2.248", 2.247", 2.245", 2.247", 2.248"
SST: 2.239", 2.240", 2.239", 2.238", 2.238"
Wolf: 2.196", 2.200", 2.203", 2.197", 2.201"
I also brought a depth mic home and measured the face depth of the three grendel bolts i have:
Underground Tactical: .1325", .133", .133"
Alexander Arms: .134" all three spots
JP Enterprise: .135", .135", .135"
I think the mic needs to be recalibrated against a standard but it replicated what my dial caliper showed pretty much. The underground tactical bolt is short a thousandth or two compared to the others. Something else i noticed was the extractor on the UT bolt is proud to the bolt face. The other bolts have the bolt face proud to the extractor. Comments?
I cycled the three different cartridges by hand with the UT bolt in the same chamber and found that the wolf had no indications of jamming on the lands. One or two of the sst rounds did show an indication maybe but not bad. Every eld showed indications like i had at the range. I bet the hot chamber shrunk on that round at the range which kept us from clearing it with the CH. i also remeasured the ELDs and they all seated a .001 or so more after being cycled through.
I swapped the UT bolt with the AA and it still had some indications on another 3 rounds of ELD cycled through. But none notice on sst or wolf. I cycled the ELDs through my other AA 16" lite with the JP bolt and it had some signs of jamming lands as well.
I think i am just going to move the UT bolt into my 10.5" grendel with the anderson barrel as i only intend on shooting wolf through that pistol. I also believe that we will stick with the sst loading for now for hunting/grouping and maybe try the ELDs later after the lands are a little more eroded. What y'all think? I'm reading more and more similar cases happening to others with AA barrels. I think if Bill reads some of these threads it might be something to look into on his end. I'm not disappointed enough to send the barrel back because it shot so well and may be bolt related, but it is concerning that others are having similar issues.
Also, does this look like flattened primers i read about? One on the right unfired; the other three are some spent cases from the rifle in question. Flattened primers mean overpressure right? Jamming the lands would cause this correct?
![[Image: Download-File?file=%2Falbums%2Fo724%2Fwo...y09cmy.jpg]](http://s1340.photobucket.com/component/Download-File?file=%2Falbums%2Fo724%2Fworthen86ford%2FIMG_1641_zpskfy09cmy.jpg)
ELD: 2.248", 2.247", 2.245", 2.247", 2.248"
SST: 2.239", 2.240", 2.239", 2.238", 2.238"
Wolf: 2.196", 2.200", 2.203", 2.197", 2.201"
I also brought a depth mic home and measured the face depth of the three grendel bolts i have:
Underground Tactical: .1325", .133", .133"
Alexander Arms: .134" all three spots
JP Enterprise: .135", .135", .135"
I think the mic needs to be recalibrated against a standard but it replicated what my dial caliper showed pretty much. The underground tactical bolt is short a thousandth or two compared to the others. Something else i noticed was the extractor on the UT bolt is proud to the bolt face. The other bolts have the bolt face proud to the extractor. Comments?
I cycled the three different cartridges by hand with the UT bolt in the same chamber and found that the wolf had no indications of jamming on the lands. One or two of the sst rounds did show an indication maybe but not bad. Every eld showed indications like i had at the range. I bet the hot chamber shrunk on that round at the range which kept us from clearing it with the CH. i also remeasured the ELDs and they all seated a .001 or so more after being cycled through.
I swapped the UT bolt with the AA and it still had some indications on another 3 rounds of ELD cycled through. But none notice on sst or wolf. I cycled the ELDs through my other AA 16" lite with the JP bolt and it had some signs of jamming lands as well.
I think i am just going to move the UT bolt into my 10.5" grendel with the anderson barrel as i only intend on shooting wolf through that pistol. I also believe that we will stick with the sst loading for now for hunting/grouping and maybe try the ELDs later after the lands are a little more eroded. What y'all think? I'm reading more and more similar cases happening to others with AA barrels. I think if Bill reads some of these threads it might be something to look into on his end. I'm not disappointed enough to send the barrel back because it shot so well and may be bolt related, but it is concerning that others are having similar issues.
Also, does this look like flattened primers i read about? One on the right unfired; the other three are some spent cases from the rifle in question. Flattened primers mean overpressure right? Jamming the lands would cause this correct?