When my father passed away I inherited his Model 53, 22 Jet (6 inch barrel). He purchased it new in 1961 or 62. Since it is next to impossible to find Hornady .222, 40 gr. 22 Jet bullets, I carefully experimented over the last several months with another bullet that has worked out very well. I selected the Hornady 35 gr. Vmax due to its short stubby shape. I was concerned about the potential increased pressure due to the .224 diameter. To offset the increased pressure, I moly coated the bullets. I know that moly coating is a hotly debated subject and that is not the point of this thread. My load is: 10 gr. of H110 powder, Federal small pistol mag primers, moly coated Hornady 35 gr. Vmax bullets. Chornographed velocities are 1600 +/- fps. Accuracy is much better than the original Hornady 22 Jet bullets (I have a few left). The load fits in the cylinder with no problems in OAL or neck diameter. Hopefully this info is helpful for the 22 Jet owners.