I have tested 4 powders in my rifle so far. Some 30 year old IMR4320 was by far the worst, with Benchmark giving the best group, half inch at a 100 yards. I then tried Big Game and W760, with the 760 being the best there. I only have a half pound of Benchmark, so if I keep the rifle and shoot it much, I'll soon be looking for more. On the other hand, I have plenty of 760.