Whew! I was googling info on the BRNO company, and found my old posting here. I got around to trying the H4227 powder, as well as H110. The H110 did very well, the H4227 was disappointing. Using 40 grain V-Max bullet gives me the best groups so far. I need to try using the Small Pistol primers next, as I have read on many sites the .22 Hornet does best with the lighter pop. Supposedly, the rifle primer can bump the bullet out a bit before actual powder ignition, according to these guys. Certainly worth a try.
Have bought the same 40 grain V-Max bullets as my initial gunshow loads, so will come as close to duplicating that load as possible.