Subsonic 243 ammo

**jeanm** · 27-06-2013, 09:31

Hi GuysI have searched the tread for any comments on subsonic 243 ammo and couldn't find anythingDoes anyone have subsonic 243 ammo or know were I can get some?Regards

**Maroelas** · 27-06-2013, 10:38

Why would you want to take a 3000fps cartridge and trim it down to 1126fps? I don't get it.

A good suppressor will take most of the sound away.

**Capt. Oblivious** · 27-06-2013, 10:43

Originally Posted by rboshoff

Why would you want to take a 3000fps cartridge and trim it down to 1126fps? I don't get it.

A good suppressor will take most of the sound away.

your trajectory will look something like this

**zakiwi** · 27-06-2013, 10:44

You can load 100 grain bullets with IMR Trialboss powder to achieve subsonic loads if you want ...

**Tetelestai** · 27-06-2013, 10:51

Don't know if you can SAFELY do it with local powders. Don't think anyone has tried, because I can't think of a good reason to do so.

The 308 with the same case dimensions and much heavier bullet is already a tricky one to get right without problems. Think the 243 will be nigh on impossible without risking that little understood thing called "detonation". Of the rifle that is, not just the cartridge. Underfilled cases have shown to be one of the factors in this.

**zakiwi** · 27-06-2013, 10:55

Originally Posted by Tetelestai

Don't know if you can SAFELY do it with local powders ...

Yes ... you have to use a powder designed for this, and the only one that I know of is IMR Trailboss .... H4895 will give you nice reduced loads, but I don't think you'll get them subsonic, but Trailboss will.

**Maroelas** · 27-06-2013, 10:58

We don't get IMR powder in SA.

**zakiwi** · 27-06-2013, 11:01

Originally Posted by rboshoff

We don't get IMR powder in SA.

Hmm ... that sucks ...

**zakiwi** · 27-06-2013, 11:09

One further point which I totally overlooked is that in order to get maximum downrange energy (within the constraints of subsonic velocity), you'd probably want to load the heaviest bullet (say 100 grains), but it is highly unlikely that you will be able to stabilize 100 grainers or even 85 grainers at such low velocity ....

Maybe it's unworkable ...

**Michaelrp** · 27-06-2013, 12:03

I have done it. I used MP200 pistol powder. Used a 100gr Hornady Inerbond. Use dacron stuffing to keep powder against the powder. With a suppressor all you can hear is the firing pin hitting the primer.