IMO - Even with 220's or 240 grain out of my 30-378 with a 28 inch barrel and two inch brake. I lost speed with powders like H50BMG. These were full cases. My best results were with 8700. Retumbo, R-25, H1000 work really well on my 200's and 220's. The 8700 was the best with 240 SMK's
Once you get into these really slow powders bullet weight and barrel length work. Your 5010 is a good deal. Try it you might like it. You will keep the pressure down /ubbthreads/images/graemlins/grin.gif