I shoot both the 308 Norma Mag and a custom 30-338, which is ballistically the same. I use Norma MRP still, since I have some on hand. My load is 75.5 grains for 3085 fps in the Norma Mag and 3125 in the 30-338 (custom barrel) But Reloder 22 and MRP are very close in burning rates, and I would start at around 73 grains of RL 22, and work up. Your max should be around 75-76 grains for about 3100 in a 24" tube. As Bruce observed, the original loading that Norma marketed was quite warm, and IIRC, the load they used was 76.7 grains of old Norma 205, which MRP replaced. I chrony'd this old ammo in 3 different rifles, all with 24 inch barrels, and every one of them was right around 3140 fps (+ - 15) Today Norma loaded ammo for the 308NM is scarce and pricey, so reloading is the answer. I now make all my brass for it from 300Win Mag brass, which works great! I still think the 308 Norma is hard to beat as a useful big 30. Regards, Eagleye.