I have an original disc and it is a good shooter. Some of the loads I shoot are 85 grains of Pyrodex RS and a 250 grain Shockwave. That should be good for your long distance shooting. Also I have shot 110 grains of Pyrodex RS and a 200 grain .400 Lehigh brass bullet in a blue MMP sabot and it was real accurate. Never hunted with it, but have no doubt it would do the job.

150 grain loads were never accurate for me. 85-110 were the best.