The Benchmark load sounds interesting, I do have a little bit to try. It was out of stock also, along with 322,1680,4895 & 3031. I couldn’t seem to find an accurate load with 4198. As I stated earlier, I got the best groups with RL 7 but can’t find that anywhere. I was spoiled and only buying powder by the pound locally, playing with many different loads in 8 different cartridges. The 38/55 I am playing with now is an Encore with a MGM barrel.