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  1. H

    Grendel-like Belted Magnum Problem

    @357Max: I appreciate all the effort and detail you put into that response and I know others do and will as time goes by. It deserves a proper response from me. I am going to answer the easier questions you have posed here but will need a week or two to answer the more involved questions as...
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    Grendel-like Belted Magnum Problem

    Thank you, Bill. Hugely (Bigly) helpful! Thank you for reading all the detail and incorporating into your responses. I am learning a lot in this thread and very much appreciate the knowledge shared! It sounds like I am doing a lot of things wrong that potentially compromise the optimum...
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    Grendel-like Belted Magnum Problem

    Glad I don't have one of those screwed up barrels! Hank
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    Grendel-like Belted Magnum Problem

    @Dino11: How do you interpret that? Given the popularity of the 6.5 Grendel in the AR platform, surely Lapua made their brass with semi-autos in mind? I'd be tempted to think their brass is made for bolt guns but that doesn't really make sense in this use case. Hank
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    Grendel-like Belted Magnum Problem

    I messed around with a heavier buffer before when trying to suppress a LMT 308. That along with an adjustable gas key made it work but the forward momentum of the heavier buffer was very noticeable and I'll admit that I am much better bolt gun driver than AR driver. All that said, I like your...
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    Grendel-like Belted Magnum Problem

    @Evintos: The SA AGB is the kind that bleeds off pressure and, if you can gauge over/under gassed by ejection pattern mine is throwing brass out between 4:30 and 5:30. I was shooting from prone and the brass was within arms reach so, 2' or so away. I have not changed the adjustment from when...
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    Grendel-like Belted Magnum Problem

    I am not really a velocity chaser either but hate to run the projectile 200 FPS slow just because my rifle is set up wrong. Also, today destroying brass puts you at risk of not being able to replace it. This whole project for me has been just that, a project. There is still dykem blue just...
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    Grendel-like Belted Magnum Problem

    Am I barking up the wrong tree or worth a try? Hank
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    Grendel-like Belted Magnum Problem

    @Evintos: Thank you for expanding my understanding by at least 100000%. Will read through that a few more times to let it sink in. Thanks also to @LRRPF52 for a similar explanation. It sounds like the unlock start time is driven by gas port location and the unlock speed is driven by...
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    Grendel-like Belted Magnum Problem

    If I am understanding y’all, the unlock time, early or late, is established primarily by the gas system length relative to barrel length (really how muck longer the bullet will be on the barrel after passing the gas port) but the ejection pattern is driven more by pressure and volume of gas...
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    Grendel-like Belted Magnum Problem

    Update from further testing. I wonder if there is a clue in this: I loaded 5 rounds with 1.2 less grains of Lever. So, 28.2 VS. 29.4. Everything else is was the same including outside air temperature. Average velocity down from 2740 to 2644 FPS. Cases ejected between 4:00 and 5:00 o'clock...
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    Grendel-like Belted Magnum Problem

    I have been shooting a 6mm ARC on and off for the past year or so. I profiled and chambered the barrel (22” Wilson w/rifle length gas), installed the extension and threaded the muzzle. The rest of the parts are reasonable quality parts and appropriate to the build. MUR Vltor upper and lower...
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    Understanding and Correcting AR Issues

    I am looking for a thread that would help all of us understand more about AR-15 operation especially when ‘problems’ are encountered. We’ve all seen the ejection angle chart and perhaps the resolution steps outlined in that chart, AGB, lighter or heavier buffer and/or buffer spring and gas...
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    Cleaner Running Suppressor Options for Semi-Autos

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    Cleaner Running Suppressor Options for Semi-Autos

    Got a chance to shoot with the OSS today. I had already shot several groups with a bolt gun and admitting that I am not the best AR trigger puller may have even been a little worse than usual due to the differences between a competition rifle and my 6mm ARC AR. I was also using year old hand...
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    Cleaner Running Suppressor Options for Semi-Autos

    Picked up OSS suppressor on Monday, 346 days after filing. Looking forward to testing it and reporting feedback soon! Henryrifle
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    New 6mm Advanced Rifle Cartridge

    @raptor99: Glad to hear that you are getting it sorted out. I don't have deep knowledge of the AR platform like several others on this board do and I don't want to mislead you or anyone else. I did look through my data and see that I was using 27 grains of Varget and even 27.2 grains at times...
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    New 6mm Advanced Rifle Cartridge

    @67rschev: That is a good beginning for your new rifle and nice shooting!--Good luck with it. @Yondering & @67rschev - any possibility the gas block is not correctly aligned with he gas port? In my relatively limited experience, I have seen this issue several times. Henryrifle
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    New 6mm Advanced Rifle Cartridge

    A lot has been written since I last took a look here. I got a chance to shot my 6mm ARC today for fun and was happy to see that my 29 grain load of CFE 223 behind a 108 ELD is still shooting well. It shot a .62 at 100 yards with bipod and squeeze bag. I had about 42 left over from deer...
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    New 6mm Advanced Rifle Cartridge

    @raptor99: I may have missed some pictures but your cases with 'belts' doesn't sound good to me. I have learned a lot from @Yondering and would defer to his knowledge when it comes to ARs. In bolt guns, however, a hard extraction and measurable expansion of the brass at that point, often...
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