05-29-2018, 01:41 PM
Hey guys Yesterday I was shooting my grendel and had my first ever bolt lug fracture since I built it 4 years ago.
19" Lilja barrel with midlength gas
Maxim\PF BCG nickel boron
SLR adjustable gas block
Surefire 762 Soccom
The build is about 4 years old with over 2000 rounds thru it and strictly reloads of:
123r. scenar
LVR 31gr.
MV 2550 at 80deg.
Its a slightly hotter round and its been shooting so well that I never even thought bolt breaks would even happen with me.
The Lug that broke was the one right below\adjacent to the extractor...Lucky for me I had a spare bolt and swapped it out and kept going.....
I had not idea it broke.....the only reason why was because the piece got jammed underneath the trigger and it wouldnt go off..lol
Considerations:
-LVR has a moderate MV change in temp changes so pressures could have spiked yesterday since it was 65deg in the morning and hit 95deg that afternoon.
-I know the surefire can adds a lot more pressure and I have only been using it the past 2.5 years
If i turn the gas down more....would that decrease chamber pressures so i can still use the hotter loads or should I just cut back the powder about .3gr....?
OR say F-k it! and keep on goin!?
Any thoughts?
19" Lilja barrel with midlength gas
Maxim\PF BCG nickel boron
SLR adjustable gas block
Surefire 762 Soccom
The build is about 4 years old with over 2000 rounds thru it and strictly reloads of:
123r. scenar
LVR 31gr.
MV 2550 at 80deg.
Its a slightly hotter round and its been shooting so well that I never even thought bolt breaks would even happen with me.
The Lug that broke was the one right below\adjacent to the extractor...Lucky for me I had a spare bolt and swapped it out and kept going.....
I had not idea it broke.....the only reason why was because the piece got jammed underneath the trigger and it wouldnt go off..lol
Considerations:
-LVR has a moderate MV change in temp changes so pressures could have spiked yesterday since it was 65deg in the morning and hit 95deg that afternoon.
-I know the surefire can adds a lot more pressure and I have only been using it the past 2.5 years
If i turn the gas down more....would that decrease chamber pressures so i can still use the hotter loads or should I just cut back the powder about .3gr....?
OR say F-k it! and keep on goin!?
Any thoughts?