[Stephen A. Camp]

Hello. Though in .38 Special +P, here is another picture of a PMC Ultramag cartridge. If memory serves, the bullet weighs 66 grains and gets about 1400 ft/sec from a 4" bbl. It is hollow all the way through and there is a nylon-like ball at the rear to seal the "tunnel" so that it can be fired. Below is my only picture of any PMC Ultramag.
I have no idea of the velocity of the round in other calibers, but suspect that it is the light/fast approach based solely on the .38 shown here.

This round hit low out of my revolvers, which is not surprising considering its light weight for caliber and high velocity for same.

I never "tested" the round on anything living, but seem to recall that gelatin tests were not that great compared to expanding bullets. This one doesn't expand from what I've seen.

I believe that it was withdrawn for a couple of reasons:

Poor sales

Concerns that it might punch the Level II Kevlar body armor used by law enforcement.

Best.

 

[Stephen A. Camp]

Hello. My own informal expansion tests with them as well as what I have seen from others indicates that they do not expand. None had any "base" left when removed from gelatin, water, ductseal, or "wetpack" and without it, pressure cannot build in the bullet itself to promote expansion.

Best.

 

[Stephen A. Camp]

Hello. I'll bet they would be good on deflating tires. Some years ago when running one brand and type of JHP against another vs ball on inflated automobile tires, the old Geco "BAT" round deflated noticeably quicker than others. I don't recall by how much as those notes are hopelessly lost, but it was measureable and repeatable. Thanks for the information on the Cyclone.

Best.