If you AR is over gassed, can it cause you to have flattened primers, even with mid-mild loads?
JTD
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If you AR is over gassed, can it cause you to have flattened primers, even with mid-mild loads?
JTD
With mine it was ejecting brass at the 1 o'clock position. Went with a H3 buffer and that solved the problem. Didn't have issues with primers flattening.
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My 308 is also ejecting at 1 o’clock, and every round I’ve loaded for it has had flattened primers. 5 different powders with 4 or 5 different charge weights for each.
JTD
What primers? I’ve seen some primers that flatten no matter what. Soft cups. Everything I’ve heard about AR10s is that they’re finicky. You try an adjustable gas block? Pics of your brass?
CCI 400 large rifle primers. The brass looks fine, is not beat up. No pressure signs. No extractor or ejector marks. Just flattened primers. https://uploads.tapatalk-cdn.com/201...49e74a455a.jpg
JTD
Nothing wrong with those. Try an adjustable gas block or a heavier buffer.Quote:
Originally Posted by JeffreyDeGraff
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They are flatter than they appear in the picture, but there is no cratering at all.
JTD
Those look like my primers in my 308. From my experience the CCI do that and look exactly like that. Both 223 and 308
My 223 and 6.5grendel use CCI primers and they don’t flatten like that. I figured they were fine, the loads have all been well below max. I had just been thinking and wondering if being overgassed could somehow cause this.
JTD
I gotcha. I look for ejector swipes and burs from the extractor as far as pressure signs go. Like Cody suggested before, heavier buffer and/or adjustable gas block should solve the over gas issue. Keep us posted!
Are you over crimping? Too much crimp can cause over pressure.
I am crimping. But just a light crimp.Quote:
Originally Posted by Scorpion Rider
JTD
I thought the primers looked fine too. I've seen some flattened primers and it was way more than those.
Thanks guys. I think I’ll look into an adjustable gas block.
JTD
I have adjustable gas on everything. AR's chambered in: 308Win . . 223Rem . . 5.56X45 . . 300BLK . . 6.8SPC . . 6.8SPCII.
If you add adjustable gas,make sure that you can get to the adjustment easily also. Some of the darn things expect you to remove the forearm ass'y.
If a load ejects too far fwd or aft,if the load is too hot or cold,if you feel that your weapons dwell time is adversely effected - - -> adjust in small increments. Keep accurate and detailed notes of the adjustments to each gun (I use the clock system ). You might never have to re-adjust . . . but then again ??
I have found that the basic reasoning for adjustment could be:
* Your load is too hot or too cold.
* Shooting subs
* Unusually heavy bullets for bore size (needs to be very lightly tweaked)
* Gas ports too big or small (YES some come from the factory frigged up)
* Make sure that you check the list of other things that could be outta whack BEFORE too much adjustment frustration. ---- SAWMAN
Quote:
Originally Posted by SAWMAN
Nice post Sawman,I have and do mess with buffer and buffer spring first,Buuuuut had a AR in 223 and while shooting reman fed loads 3 boxes(1000 rds each), would shatter buffers, was over it after 3, Adjustable gas block went on it never thought twice of adding to the build/put together bench,some may be wide open but,ya have the option to turn down if needed. Just my experience with 4 Ar platformed rifles,and they can do get to dreamy to shoot if they help,not hard bangs at the buttstock and a bit quieter closer to the shooter as far as action noise.
I'll have to agree, good information. One of my AR throws the cases about 1 and 2 o'clock, didn't know why. I think I have another adjustable block around somewhere to try.