I've used MRP for a long time........it's really good in both the 270 Win, 280 Rem, 7mm Mag and 338 Win, but there are better choices for an 'o6.
The Norma site referenced in another poster's reply is a good source as is Wolfe Publishing "Propellant Profiles" and Ken Waters "Pet Loads" series.
IME, the load data for RL22 has been inter-changable although the powders are NOT the same..........color is different, granules are different and MRP slows better.
They also come from different manufacturing plants as well.
MM
