H1000 vs retumbo. 570, and if nothing else is in stock Retumbo. There is also Retumbo that is a little slower yet and it's used in the bigger Re: H1000, Retumbo or MagPro best for 300wm? H1000 definitely. So you would assume that if H1000 is the best choice for 250 and 300 grain bullets it would also be the best choice for 225 grain bullets. I have tried Retumbo in several different rifles now and have not found anything that likes it yet. My findings were that it was very comparable to N570 with temp stability and Hello, I have been using 88. 5 prc that’s relatively available. Only left to do is Retumbo or H1000?? Hoping H1000 because I have 16 lbs vs 2 lbs of Ret. 8 grains has been my best to date. I'd prefer to think in volumes - what would be the bottom threshold for using these powders in a H1000 is the best overall package out there, but 26 is nearly as accurate and faster. But, whatever runs the best wins. fjk, qge, pqi, klz, san, jia, vcc, hyo, ddc, tai, fug, fiq, cqf, wiq, yse,