You have to sign up to view them, but it's free, and another good source of gun-related info, just like this board. Here are some links for you from the forum. If you have access to a chronograph, try working up a load of IMR Trail Boss starting with about 5 grains. Much more is going to break the sound barrier. 308 BTB offering is the 170 grain LMN, and it will work with the same load as the heavier 200 grain cast bullet, but just won't carry quite as much energy and momentum at the 1000 fps velocity I am aiming for.Īs to loads, try about 5 grains of Hodgdon Clays. If you don't cast your own, take a look at the offerings by this board's sponsor, Beartooth Bullets. Something like the bullet the Lee 200 grain C309-200-R mold produces will work well and is shorter than a lot of pointy 180 grain bullets, so it will still fit the. To get maximum momentum and energy at sub-sonic velocity what you want is a heavy cast bullet fired by a bulky fast single-base powder that doesn't keep making more gas as the bullet gets down the tube. Since that barrel has a 10" twist, you don't really need to worry about stability at slow speed for blunt shaped cast bullets. That is so you don't have to give up as many foot-lbs of terminal energy. Another point is that, for a given charge, to get the bullet to go more slowly, you maximize its weight. 308 Win Encore barrel? That long barrel will mean keeping the charge very small to stay subsonic. I assume your buddy has the standard 28". One thing that will happen is velocity will vary with barrel length for a given charge.
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