I am having some trouble with velocity deviations of around 100fps with RL22 in a 300RUM. The load is a published load with max velocity of around 3290. Pressure signs are fine and most of the loads chrono very consistently. The loads that blow my mind are down around 3200 which seems like alot to me. When this happens, of course, the shot pulls out of the group. Does this sound like a primer problem or do you guys think I might have a scale problem. My scale is a RCBS 505. (Not the nicest one I know) and the primers are Fed. 215. I am going to try the 215 match primers. If that doesn't help I am going to buy a new scale. Any other ideas....brass, powder, etc?)