Agreed Ron should be the go-to guy on H&N pellets for guns he's personally worked on, but I'd think he should be, since he very likely tested different pellets in yours and other owners guns after he did the work to see what shot best in them.
For guns he hasn't, he's in the same boat the rest of us are and while we can all suggest pellets based on what our own guns shoot well, what does for us might well not work for the people asking.
Random lame suggestion would be buy a tin each of the top 4 suggestions in the thread and start shooting for groups. It's what I did with mine and Air Arms Falcons actually ended up shooting the best in mine with the FTT 5.54's I mentioned above coming in very close 2nd. My only reason for switching to the FTT's was because I'm not paying the now $25.99 a tin PA wants for them...lol.