Hey Art, I have been loading up the Speer 90 Gr. TNT with H322 and H4198 powder and it is very accurate and very fast. How about loading some up with your special "atomic" powder that you use? I'm sure it would make a great varmint load and it would make a great target round also since it is very accurate. I can get 10 rounds in less than an inch at 100 yards with the Ko-Tonics Chrome lined barrel.