Oddball question - 308 subsonic 200 gr and Ramshot TAC

[armoredman]

Any experience with these? I am just playing with the idea of buying a suppressor for my CZ 600 Alpha in .308, and I was gifted some 200gr sized .309 boolits for subsonic loads. Only powders I have that might work is TAC and IMR 4064, right now. Just kind of playing with the idea, down the line after we get past some medical bills.

[BK7saum]

Both are way too slow for subsonic use.

The case capacity is too large. I have used trail boss or some of the bulky pistol powders to load subsonic in 308 sized cases. If this is your first foray into subs, I would stick with trailboss as a starting point.

Also, what is the twist of your barrel. You might not be able to stabilize the 200 boolits. I havd to drop down to 180s in a couple of rifles to get them stabilized.

[steve urquell]

Any experience with these? I am just playing with the idea of buying a suppressor for my CZ 600 Alpha in .308, and I was gifted some 200gr sized .309 boolits for subsonic loads. Only powders I have that might work is TAC and IMR 4064, right now. Just kind of playing with the idea, down the line after we get past some medical bills.

Hodgdon has a bit of sub data for .308. Your 1:10 twist barrel should stabilize the 200gr. If you have some Titegroup it is listed as a suitable powder. Fast pistol/shotgun powders are not position sensitive and are OK for loading in big cases w/o filler. Below "rifle pistol, shotgun switch "all" to "subsonic" Here's the data:
https://hodgdonreloading.com/rldc/?t=1

[armoredman]

Interesting, but of course, I don't have any of those powders...Of course, drop by 10% for cast, and the data would be for the 220, since they don't have for 200, but still, it's an awesome head start, thank you.

[MotelAlpha]

5744 has proven to be Not sensitive to a lower filled case...but many have found that it also does not need a filler i.e fluff if that helps
Happy New Year

[charlie b]

When playing with lighter loads in my .308 (1-10 twist) I found that my 210gn bullet was not stable at anything under 1200fps. Not sure if it was a transonic thing or spin stability issue but they weren't accurate at all. OTOH, the 165 XCB and 180gn Lee bullets were good at 1000fps, and a lot of fun to shoot FWIW I liked an 8gn load of Blue Dot.

http://www.gmdr.com/lever/lowveldata.htm

The .30-30 data tracks with my .308 velocity and accuracy wise.

[Larry Gibson]

As BK7saum mentions, those powders (TAC and 4064) are way too slow burning. You'll need to get the 200 gr bullet down to 1050 - 1125 fps to be subsonic and not "crack" out of the suppressor. I've shot a lot of 311299s loaded over Unique out of 10 and 11" twist .308W chambered barrels subsonic w/o any stability problems. However, for my subsonic cast load in my suppressed 308W (10" twist) I prefer a Lyman 311041 or Lee copy over 6.5 gr of Bullseye. I use LC fire formed cases with the flash holes drilled. Here's 10 shots at 50 yards I shot the other day confirming 50 yard zero with new scope on rifle. Velocity is 1125 fps.