Subsonic 300 win mag load??

[was21]

Wasn't able to pull up anything using the search.

Anyone out there work up a good subsonic 300 win mag load?

Going to be trying with some 208's and Trailboss for a start.

thx

 

[was21]

Found the IMR data for a 150 SIE SP in 300 win mag using Trailboss

3.340 oal

18gr = 1302 fps
25.5 = 1687 fps

...still looking for info /data/real experience with the 208's or other heavies but at least this is a start point.

 

[pawprint2]

You may want to give Lapua a look, they mfg a 30 Cal 200gr Subsonic bullet. I'd stick with Trailboss-lot of bulk.

 

[SUIScide]

The long 208 may not be stable in a 10" twist at subsonic velocity. I think a 150 grain bullet might be a good place to start with trailboss. Good luck