![]() In fact you could use 7.65mm pistol bullets which would even expand at subsonic velocities, but the muzzle velocity tends to be very erratic in 308 sized case. For terminal ballistics every bullet you can find would be fine and the trajectory is virtually the same (no gain from heavier bullets). Longer bullets (boat tail and hollow point) require faster twist to stabilize. In 1-10" barrel twist any flat base (no boat tail) bullets up to 200gr should be fine, if you have 1-12" the 150gr would be safe bet and 180gr may be on the edge. Beware though, jacketed bullets may be quite erratic regarding muzzle velocity. you could try and find some flat tip bullets like 150gr manufactured for 30-30 (flat tip required for tubular magazine). If this is not possible due to legislation etc. Round nose isn't optimal for terminal ballistics so I cut the tip flat (can be done with a metal file but I use mill). I've had good results with H&N ( H&N air gun pellets and bullets) plated bullets, very low muzzle velocity variation. From there on the drop's quite bad (1MRAD/7.5cm at 75m and 2.5MRAD/25cm at 100m are good rulees of thumb for any projectile at around 300m/s) and muzzle velocity variation can ruin the accuracy. As you can see, the Trail Boss powder is seriously huge. Bullets, casings, scale, sharpie, cotton balls, punch tool, Trail Boss powder. 223 ammo: Everything needed to create a subsonic 55 grain round that will deliver 128 ft/lb energy at 1000 FT/s. ![]() Up to something like 50m, the muzzle velocity variation won't play a big role in accuracy. Here is a general step-by-step on making subsonic. I've never used filler (Dacron or similar) since I'm concerned whether it would build up in moderator. This is due to the low load density, even tipping the barrel up or down can have a drastic effect. Please be aware that muzzle velocity could vary quite much. I have experience only in Vihtavuori powders, N310 and N320 are good, start from 9 grains and work your way down.
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