Has anyone ever duplicated the Underwood or Buffalo Bore 380+P loadings of a 90 gr xtp at 1200?
I get 1100 fps 90 gr speer JHP Gold Dot in Kel tec P3AT or Ruger LCP 2" barrels 6.2 gr Power Pistol [book load is 4.8 gr]
Those two small pistols are at the threshold of guppy belly case bulge with feed ramp intrusion into the chamber of 0.270". With case webs only 0.100" thick, that leaves 0.170" of unsupported thin brass case wall.
All the other 380 pistols I have measured have better chamber support. Other 380 pistol have longer barrels, and will get higher velocity.
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway The man who makes no mistakes does not usually make anything.-- Edward John Phelps
Was at the range yesterday testing the 90gn XTP with Accurate #2 powder. 3.7 grains from my Baby Rock (3.75" barrel) averaged 1154fps. They were definitely spicy. From my LCPII they averaged 1077. Not sure I'd want to try to get any more from a 380 cartridge.
I have not experimented with +P loads in .380 because it is not a SAAMI recognized caliber and also because the Lehigh solids and Buffalo Bore hard cast standard pressure rounds appear to be good enough as is. (Lehigh has load data on its website.) I would be interested in seeing how the +P loads discussed in this thread compare against the standard velocity versions that I shot, but I am not going to volunteer for that. The standard velocity versions of popular hollow points did not do well.
Last edited by Cheyenne; 02/04/23. Reason: fix link
"Don't believe everything you see on the Internet" - Abraham Lincoln
In college I 'accidentally' over-charged my loads with an XTP and crony said 1050-1100+ as I recall.
It seemed harsh on that PPK/S and I quickly dropped that load for concern of safety. I would not personally try making the 380 more than it is....just me. Be safe folks.