tdowdle wrote:
Can you share that reloading data for your subsonic 308 rounds? I've been doing some research into that very thing and I would love to see what you have worked up.
Here is a link to the basics on sub-sonic loading.
http://members.shaw.ca/cronhelm/DevelopSubsonic.html
I've learned that sub-sonic loading is a science all its own. There are so many variables from one rifle to another, what is a good load in one is not so good in another. Some of the variables are barrel length, can or integral, if intagral - is the barrel ported or not.
My set up is an integral suppressor with 18in barrel that is ported.
Components:
AA5744 powder
Lake city and Winchester brass w/flash holes drilled out (see link)
Winchester magnum primers
Lapua 200gr subsonic bullets
My initial tests were only with Lake City 7.62 military brass.
15 gr Avg 1022 fps
16 gr Avg 1103 fps
17 gr Avg 1168 fps
20 gr Avg 1332 fps
I had some real problems closeing the bolt on the military brass as the chamber was cut on the tight side of .308 winchester specs. So I wanted to try some comercial .308 to see if it'd be easier to close the bolt. It was.
OK the next time out I loaded up with 14.7 grains of AA5744
LC brass around 930 fps (almost perfect)
Winchester brass was 890 fps (a little slow)
Now I'm planning on trying Winchester brass with 15 grains. Don't know when I'll get back out to the range though.
BTW what kind of set up are you running?