Request info - Sub-sonic ammo in a longer barrel?

steyr_m

steyr_m

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I'm looking at buying a CZ 452 American. I'd like to shoot sub-sonic ammo through it because it's easier on the ears.

My issue is.... I know the longer the barrel, the higher the velocity. That rifle has a 22.5" barrel, is sub-sonic ammo supposed to go through a certain barrel length? ie under 20-22" so it doesn't go over the 1,126 ft/s mark?
 
No. After about 16-17" a subsonic round will start to slow down again due to complete combustion of the powder charge.

With 22lr, the longer the barrel, the quieter, generally.
 
Also keep in mind that virtually all target ammo is subsonic, because there is an accuracy advantage in avoiding the sound barrier.
 
Anecdotal evidence is by no means conclusive but it does give indication the above comments are reasonable. Out of my 28" 40X barrel, subsonic target ammo has very low sound. Another consideration as has been expressed in many previous threads is that subsonic ammo is less affected by wind.
Regards
dryfire
 
I use Remington and CCI subsonic HPs in my 21"' barreled Cooey. (Had one years ago and just bought a new to me one)

Both shoot great and the Rabbits don't complain. But then, I am not shooting much more than say 50m with those iron sights.

They do a really awesome job on gophers in with the horses too. I dont worry about riccochets or over penetration and I know exactly where the bullet is going to go. Oh, and the effect on the gophers leaves nothing to ask for except more gophers and ammo.
 
The speed of sound changes with temperature, and it's lower than 1126 fps. at this time of the year.

speed_of_sound_chart.jpg


Just choose your ammo accordingly and keep in mind that the velocity they tell you for a given ammo is the average. Some of those rounds may be 20-30 fps. higher, depending on the quality of the ammo.

For hunting, the Winchester TCHP Subsonic works nicely, and for target shooting, Eley Match Pistol is nice. Both or these have velocities around 1000-1020 fps., so they stay subsonic even in freezing weather. I have shot both in below 0F weather, and neither made a sonic crack out of a boltgun with a 21" barrel. Have had no luck in finding a cheaper match round that stays quiet in the winter, but there are many inexpensive alternatives that will be fine in warmer weather.
 
Yes temperature does change the speed of sound. However temperature also affects the energy of the powder, and velocities tend to decrease as the cartridges get colder. For that reason I believe biathlon ammo is loaded to a higher velocity at standard temperatures so it will produce standard target velocities when it is cold.

Remington sub sonics have produced accuracy comparable to lower end target ammo for me.
 
Can't really understand the logic/concern with the question, but I'm sure the answer is "no." I'm also not sure how the issue of CBs came-up either, but other than being quiet...I see no advantage with them. They are inconsistent, and ill-suited for almost any hunting application. Especially compared to even the lowly subsonic rounds. (which I like allot, BTW ;) )

Best advice you hear on forums...and you read it allot~buy a variety of ammo. and see what your gun likes. There is lots of variety where .22lr is concerned. My favorites are Federal Gold Medal Target, and CCI Subsonic HP.
 
dryfire said:
Another consideration as has been expressed in many previous threads is that subsonic ammo is less affected by wind.
Click to expand...

I don't follow this logic. I would think that with the longer flight time for a given distance, subsonic bullets should be affected more by wind.

Not saying the thought quoted is wrong... it just don't make no nevermind anyhow to me.
 
rimfiremac
I'll let you do your own research on atmospheric effects on projectiles in and around the transonic zone. Threads on here and stickies. Otherwise if its nonevermind then 'run what you brung'.
 
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