I've recently started loading 9mm Major*. I got a batch of RMR's 124 JHP's to experiment with. So far, I am impressed. Here are some of my observations:
*For those unfamiliar, this is 9mm loaded up well past SAAMI specs for use in specialized USPSA/IPSC race guns with gunsmith-fit barrels and compensators that delay unlocking.
- The weight tolerance on these is tight. Combine these projectiles with sorted-headstamp brass of similarly tight weight specs (such as Starline), and a QC weighing of completed rounds would detect a no-charge squib. That's nice.
- They're clean to handle. I have little patience for projectiles that leave lead dust smudges on my hands. These don't. And, like most/all JHP's, their base has no exposed lead, so I'm not getting atomized lead upward through my compensator.
- The ogive/profile is quite rounded. It feeds well, although it's portly enough to require some care with OAL setting to make sure you don't have ogive/throat interference issues with a tight-chambered gun.
- These things do not mind being run hard! I have been driving them at 1370-1400 fps and see no indications that they are having any trouble. Velocity spreads are staying tight, I'm not getting any copper fouling to speak of, and they're printing groups as small as I am capable of generating.
*For those unfamiliar, this is 9mm loaded up well past SAAMI specs for use in specialized USPSA/IPSC race guns with gunsmith-fit barrels and compensators that delay unlocking.