I'd use CFE BLK and Rem 7 1/2s, it's a killer combination in the 17 Hornady Hornet, and they're relatively similar. Some people load with small pistol primers or Rem 6 1/2s and you get heavy cratering or blanking. If I were to use a small pistol primer, like I do in 22 Hornet with Lilgun, I'd use a CCI 550, as they have a cup similar to most small rifle primers, and will handle 50k+ psi without blanking. I doubt very seriously, you'll ever get enough Imr4198 in that case, to be satisfied. CFE BLK, SW Blackout, AA1680, and AA2200, are really the best options, you can try Imr4227, it'll be accurate, but probably slow.