Trailboss won't get the bullets to expand properly, that's my experience. Tried it just recently.
The 30/30 advice is the way to go. Use a soft, heavy projectile that will expand at modest velocities, and do the damage.
A Speer 165gr BTSP is a very soft, fast killing bullet. You don't really want to mess around with hard bullets in a short barrel with low velocity.
In my 18" .308 with full power, at longer ranges - say 400m - its only doing 1900fps but it still opens up nicely and flattens smaller deer. So if you are shooting deer within 150m or so, loading it for a muzzle velocity of 2100fps or so will get you the same result, with a whole lot less recoil.
AR2208 (Varget) will do that for you with the short barrel, 38gr or so, well within the safe load range for that powder in .308.
That generates about the same recoil as a .243 with a full speed 100gr bullet, or a 6.5 Grendel with a 120gr bullet.
You nipper will be well proud of himself if he gets to nail a deer with that.
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