No I haven't tried any fire formed yet. I have a 100 piece lot that I was trying to get through. I have 41 more to go yet. When I get to that point I have a Lee collet die for the job. I was hoping I could find a good load before I got through them, but not yet. On the other hand, I do not know how much influence I have on this mix either. I have got some decent groups with the 50 grain bullets. The trigger pull is fairly heavy for my taste. I like a relatively light pull. I have gotten vertical strings, but also some horizontal ones too. That tells me, that I maybe at fault here too. I have a hard time concentrating on trigger pull with gloves on and 20 degrees out. I am used to light pulls in my other rifles and usually only have my finger on the trigger with nothing else touching. This is way too heavy for that. I need the trigger time anyway. I would like to get some cheap bullets to work, but will settle for any thing that works. I am going to order some more bullet types soon to try out. I had the WW 46, 40 V MAX and a few Barnes 36 grain grenades on hand that I think are suitable for the 22 Hornet I was hoping the Mid South 50 grain bullets would work and they show some promise. I have no idea what kind of MV it takes to open these up. I have been watching and asking what kind of experience anyone has had, but have not heard or seen a thing. I think I will order some more of the WW 46 grain, 35 V MAX and Speer 33 grain bullets. All of the cases have been loaded up with Remington 1 1/2 small pistol primers. The only other small pistol primers I have are CCI 550 magnum and WW WSPM that I have to shoot heavy 357 loads with. I am not sure how they would react in this small case. I also have many different small rifle primers. I have some Federals, Remington 6 1/2, WW and a large supply (for me) of CCI BR4 and Remington 7 1/2. The Remington 7 1/2 is my favorite primer in my 221's, 222 and 223 rifles. Just keep plugging, I guess this is what makes it a challenge.