Quote:
Originally Posted by skippy
Does the longer length help with the bolt cycling?? That stuff is SUPER quiet; but, the bolt will not cycle in my 10/22.
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No, it doesn't . Don't confuse the Aguila SSS ammo with the Aguila Colibri ammo. The Colibri ammo has about half the wegiht bullet and about half the powder charge of the SSS. I bought a box of Colibri and it doesn't cycle any semi auto I own. It works ok in bolt actions and single shots but the light bullet has a low BC. I consider it a "gallery" charge suitable shooting indoors or plinking mice in a barn. It is quieter than the SSS ammo, but I consider it pretty useless.
The SSS ammo with a 60 grain parbolic nose bullet is accurate to 200 yards and usable to 400 yards. The 60 grain subsonic bullet carries about 1/3 the energy of o 220 grain subsonic 300wtf at 100+ yards. I willl go through a pine 2x4 in the 4 inch direction at 25 yards. It cycles any 22LR I've tried it in including two 10/22s ( 16 and 29" barrels), a 22" Marlin 60, and in several semi auto pistols with 4" to 12" barrels. All of them cycle ok. On blow-back actions (which almost all 22LR's use) the bolt starts moving as soon as the chamber pressure rises. Barrel length simply makes no differece to how most semi-auto actions cycle with the SSS ammo. Some stiff actions which need high high energy 22LR might not.
With a semi-auto with a barrel 22" or longer most of the noise comes from the breech blast, not from muzzle blast. The breech blast occurs in any blow back 22LR, but with shorter barrels the muzzle blast is more noticable. The SSS case is the same length as a 22 short, so the breech opens with less bolt movement than with normal 22LR cartridges.
The SSS ammo does have stability problems at sea level in cold weather with 15" twist barels. It's got excellent accuracy at the mile elevation year around where I shoot from 15" or 16" twist barrels. 9" twist barrels are available for 10/22s which will stabilze SSS ammo even in sub zero temperatures at sea level. I have a 16" 10/22 barrel which shoots ok too, but it's louder than the 29" barrel having both muzzle blast and breech blast. The Marlin 60 also has breech blast louder than muzzle blast.
Bottom line is if you want a quiet rifle to shoot Aguila SSS ammo use a bolt, lever, or single shot action with a 24" to 30" barrel (or with a suppressor). Revolvers aren't quiet because of the blowby at the front of the cylinder.
AR-15's like the 300wtf work because the breech doesn't even start to unlock until the bullet has passed the gas port and the bullet is far past the muzzle before the case is extracted from the chamber. A 300wtf howver won't be very quiet even with a 30" barrel. It has too much chamber capacity to give enough expansion ratio to make the propellant gasses subsoinic at the muzzle.
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