Originally Posted By: GreyhunterOriginally Posted By: IndexFingerOriginally Posted By: GreyhunterOriginally Posted By: IndexFingerOriginally Posted By: Kevinfarmer3456In my opinion the quietest supersonic AR platform would have to be the 300 Blackout simply because it has the least amount of powder
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300B0 suppressor with AR15 platform . high Vel. a 'pistol position' gas block on 300BO it will never be sweet to the ears .
Only if you dedicate it to 'high Vel.only' / no Sub's . move mid or rifle gas position and tune with adj. gas block it will get better.
got to say..suppressed 30-221 rem/300BO in a Boltaction is really a 'sweet snap' out in the open fields on a quiet night .
But for AR's in 223/6mm/25 all suppressed and using adj. gas block .
I have not noticed all that much of a difference for the POP . they are all good to the ear, but never as nice a mellow snap as a boltaction in same Cal.and suppressed .
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This follows what I have read elsewhere, that 300BO can be pretty rowdy at the port with supers which I assume comes from the pistol gas system. I know the short 300's are pistol gas and have seen 16" 300 barrels that are carbine gas but I have not seen them in mid or rifle length.
I ordered a 20" .223 barrel for the new thermal upper but I am considering doing something different with my current 16" upper. Maybe a 16" 300 with supers for day time calling and a short 300 upper for playing with subs when my SBR stamp comes.
I went with 20" for the .223 because it was the longest I was willing to hang a suppressor off of, with the hope of it producing producing lower muzzle blast than an 18".
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For strictly sticking with a .223 parent case and it's AR size Bolt . for Shorter length barrel and hanging a suppressor off for easy handling out hunting, But still keeping the speed, and wanting bigger Diam. bullet than a .224 . That was what I went threw running the gambit of Bore size over the years.
224/ 6mm / .30 Bore Size . . For 16" and hanging a Suppressor off . Last year I found that a 25x45 turned out to be big unexpected surprise, .25 Diam Bore was the most efficient for 16" an Running High Vel. . and it a real hard hitter out to 300 yard with 87 grainers .
I love 6x45 . for a great accuracy and flat shooter, it super easy neck-up and shoot . but you need to keep the barrel long to get that speed . and I shot .30-221 rem. way over 20+ years bolt and AR . it is real efficient on the Burn in 16" with suppressor but you wont squeeze more than 2400 fps. with a 16".
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https://store.srcarms.com/product-p/25x45-87hc.htm
Is that the round you are referring to? Looks interesting.
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yep.. Sharps took the time and money SAAMI spec.it, and make a retail supply of Brass and small selection of factory load ammo . but it basic just a ( 25x45 ) necked-up .223 to a .257 . . with No Brass Cut/trimming . just load and go . For moving up larger than .224 Bore, the .25 Bore Diam. is just perfect for 16" and still making speed .
Was bad timing for Sharps being brought out about same time as 6.8spc and 300BO . Sharps got walked-on pretty hard by bigger advertisement push, especially the blanket coverage by Silvers and AAC on 300bo was just HUGE push and they covered most shooting forums to counter any/all negative talk .
I really like the 6.8 spc. but strictly sticking with a .223 AR Bolt and 16" barrel the 25x45 is overlooked especially if hanging extra length of Suppressor off the muzzle . I have got 2800+ FPS with 87 grn. bullets, but there is a sweet node running right into 2700 fps Vel. .
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