ryutzy
New member
RRA LAR-8 20 in barrel in 243 with a ThunderBeast Ultra 7
Ok I’m shooting above setup- I handload and am shooting 75 vmax for yotes. Issue Im having is gun jamming every so often but only with suppressor on. Factory Hornady SuperPerformance jams every time- long writeup on Hornady’s site about not using SuperPerformance powder in short barrels shooting suppressed, because of powder burn time/pressure peak in/at suppressor etc. I have tried multiple powders and here’s my results: Varget jams 40% of the time. H414 has not jammed yet but only fired 5 rounds. H4895 has been perfect- 100% reliable 40+ rounds fired. Basically faster burning powders work better shooting suppressed in short barreled gas guns. I will try Benchmark and 4064 yet. Several questions I have: Can I get an adjustable gas block on the RR LAR-8 and still maintain the free float barrel? (It’s under the forearm). I’d rather not have to mess with it. So far I’ve only been able to get 3,260 FPS from H4895 but I got 3,400 from Varget. My goal was 3,300+ from 20” barrel. Accuracy of all rounds tested is good. 3/4 inch @100 yards. Anyone have experience with this and what should be my next step?
No/Minimal pressure signs with H4895 but I hit a good node and velocity actually decreased slightly with more powder (38.4 then 38.8 then 39.2). 38.4 was fastest. Try magnum primers? Any other things I should try or do I just need an adjustable gas block? Thanks
Ok I’m shooting above setup- I handload and am shooting 75 vmax for yotes. Issue Im having is gun jamming every so often but only with suppressor on. Factory Hornady SuperPerformance jams every time- long writeup on Hornady’s site about not using SuperPerformance powder in short barrels shooting suppressed, because of powder burn time/pressure peak in/at suppressor etc. I have tried multiple powders and here’s my results: Varget jams 40% of the time. H414 has not jammed yet but only fired 5 rounds. H4895 has been perfect- 100% reliable 40+ rounds fired. Basically faster burning powders work better shooting suppressed in short barreled gas guns. I will try Benchmark and 4064 yet. Several questions I have: Can I get an adjustable gas block on the RR LAR-8 and still maintain the free float barrel? (It’s under the forearm). I’d rather not have to mess with it. So far I’ve only been able to get 3,260 FPS from H4895 but I got 3,400 from Varget. My goal was 3,300+ from 20” barrel. Accuracy of all rounds tested is good. 3/4 inch @100 yards. Anyone have experience with this and what should be my next step?
No/Minimal pressure signs with H4895 but I hit a good node and velocity actually decreased slightly with more powder (38.4 then 38.8 then 39.2). 38.4 was fastest. Try magnum primers? Any other things I should try or do I just need an adjustable gas block? Thanks