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Topic starter
I have two new projects coming up, .223 sub sonic and .303 sub sonic
Right now, its the .223.
Does anyone have any starting points for this reload?
I am thinking of perhaps a heavier bullet, just to try one up on the .22 subsonic , it will be pointless making a .223 that is no more than a .22 subsonic.
The .22 subsonic heaviest bullet is the 60 gr, but it will usually not stabilize in most .22 barrels, the usual .22 subsonic appears to be a 40 gr bullet.
Will a 70 grain .223 type bullet stabilize at subsonic speeds in a 1-9 barrel?
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 3:49 am
The heavier the bullet the easier it is to get a speed below 1100fps. So a 70gr bullet should work well.
https://hodgdon.com/wp-content/uploads/2020/07/subsonic-data-final.pdf
Posted : 28/09/2022 4:11 am
Topic starter
Hi Oom Drie, looked at that, but at 55 gr, I may as well just use the over counter .22 LR sub-sonic.
Was wondering along the lines of SOMCHEM as well S265 or S221 perhaps.
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 9:31 am
Herewith data with MP200. 3gr MP200 with 69gr Sierra Match King. Predicted speed 1130fps. You would need to fill the void with Dacron.
What length is the barrel - I used 22 inch.
Posted : 28/09/2022 10:07 am
Topic starter
18 " - the one I built for Cody nearly 10 years ago. Ruger All American
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 10:33 am
Topic starter
My Quickload has gone beserk, the screen has changed and most loads show "startup pressure too high" Huh ???
Start up pressure is 3626 psi
Whats changed ? Why?
Did have a power induced PC blow up and everything reinstalled ?
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 10:36 am
Reduce that pressure to 1500psi and the calcs are there again. I am battling to post photos from my PC. How do I do that on this forum, as I only get a URL choice.
Posted : 28/09/2022 11:52 am
Herewith image I wanted to post.
Posted : 28/09/2022 12:13 pm
Topic starter
Thank You, you always come through.
After much battle I came up with 1063 fps - but I was using 223 Remington SAAMI you use just 223 Remington, Why ?
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 2:30 pm
When I started asking about sub sonic reloading I was told repeatedly to go as heavy as possible, simply because the low speed is the limit. Heavier makes for better penetration.
Hornady makes a 90gr bullet. One should be able to seat it fairly deep in the case.
Posted : 28/09/2022 9:24 pm
A rifle case with 3 grains of powder in it ?
Software does not predict a SEE for you.
Posted : 28/09/2022 10:01 pm
A rifle case with 3 grains of powder in it ?
Software does not predict a SEE for you.
I shoot my 308 with 5gr of MP200 for 800fps with 173gr LRN.
The reason why I took the speed so low is to stay clear of the transsonic zone. I had some trouble with that in my .22LR.
Posted : 28/09/2022 10:42 pm
Topic starter
I will now see if I can find some heavy .223 bullets, would like to find a lead cast bullet actually.
I am who I am - I am not who you want me to be.
Therefore I am me.
Posted : 28/09/2022 10:44 pm
Twist rate might upset any plans of bullets heavier than 75gr in a 1 in 9 twist. Treeman should check that twist rate.
Posted : 28/09/2022 11:01 pm
A rifle case with 3 grains of powder in it ?
Software does not predict a SEE for you.
Have a look at this data from Hodgon.
https://hodgdon.com/wp-content/uploads/2020/07/subsonic-data-final.pdf
Posted : 28/09/2022 11:03 pm
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