Thread: Subsonic .223??

Does anyone know if we can purchase subsonic 223 ammo in nz?? I've been looking , and can't seem to.find any??

Never seen it....may be something that'd have to reloaded?

You might need to reload

Trouble is Trailboss is unavailable

Hi Have bought subsonic .223 from Belmont Wanganui in the past
they use a 55 grain projectile x 4.10 grain T/Boss they havent had any for a while now and seem to make it just now and then when not busy doing other rounds
Trail Boss is easy to reload with if you have any ,if using other fine powder just be aware of excess unused space in your .223 brass
Good Luck

What sort of twist rate would be required to stabilise?

You can down-load with any powder. The "fill the case" is a too-often repeated myth.

My main question would be, Why? you are effectively limiting yourself .22LR ballistics (Winchester do at the 40gn end and Aguila do a 60gn sub)
But with copper or tipped projectiles, that will not perform as intended at such low velocities.

Originally Posted by Snoppernator

What sort of twist rate would be required to stabilise?

Given the average 22LR is 1:16 and the average .223 is 1:12 or better, stabilisation will probably not be an issue.

Originally Posted by 11mms

You can down-load with any powder. The "fill the case" is a too-often repeated myth.

My main question would be, Why? you are effectively limiting yourself .22LR ballistics (Winchester do at the 40gn end and Aguila do a 60gn sub)
But with copper or tipped projectiles, that will not perform as intended at such low velocities.

I take it you have never had ba..booom rounds before then???? Having to point rifle at the moon,slowly lower onto target then fire is not ideal and does wonders towards creating a flinch...

I questioned relevance myself but recently saw the light. That goat,wallaby,possum while your in deer country....yeah if used with care they have a use.

Originally Posted by Micky Duck

I take it you have never had ba..booom rounds before then???? Having to point rifle at the moon,slowly lower onto target then fire is not ideal and does wonders towards creating a flinch...

Nope, what cartridge/loading did you experience that?? Sounds like a lazy primer to me?

Also never seen any effect of "settling the powder against the primer" (It'll flow horizontal again when you level the rifle...); nor using fillers

.270winchester 760 powder 110grn projectile..loaded by sports shop to suggested amount for 3k speed...I duplicated it years later with no issues.
but it has made me very wary of reducing loads below what book suggests is safe.

If you can't get trailboss use a fast shotgun/pistol powder which are still fairly easy to get hold of. They are actually a lot less smokey than TB, and usually have no issue with case position due to the fast burning rate. They do have the other problem though, in that if you have too much the pressure can spike so high so fast you can pop things without a lot of warning. Safe-safe-safe-boom...

You used to get .218Bee projectiles, which were a very flat nosed segmented bullet of about 55Gr that was perfect for subsonic use and actually really good for things like fallow in .22 Hornet sized rounds. Not sure if they are still available...

7gr's Trailboss.

Yip I use 55gr SP with 4 gr Trailboss for camp possums and wounded goats or deer needing a suppressor to the ear , haven’t needed to yet. Super quiet and really good around the dogs.