I am running subs in my Brno ZKK 601 rebarreled to 7.62x39. I run 200gr cast hollow point projectiles with 6.5gr Trail Boss. I have the same load for a Howa Mini but with the barrel cut down to 16" I can use 6.7gr of Trail Boss. Gives me an average 1060fps. They drop like a brick and it is really important to know their limitations. Personally I won't use them once an animal is outside 50M. I have also played with a few different .311 projectiles but find they don't mushroom and so head and neck shots are best.
Instead of working up a load you need to work down a load as you really don't want a projectile stuck in your barrel. Trail Boss is excellent as it gives you a good case full and it really works out cheap.
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