Full disclosure... many of them:The hot loads with the 230 FMJ averaged 2499 fps. I started them out much lower. It was an experiment to see how much pressure the Precision Delta exposed lead base FMJ bullets would take before the jacket would lift off the core in the muzzle brake. I had spoken to the owner of PD and he could not tell me what kind of load they would take but wanted to know what I found. When I called back with the results the guy nearly jumped through the phone. He never considered these power levels but the bullets performed fine with no leading and no jacket separation in the brake. It had a very tight exit.
--I realize that you aren't playing with these anymore
--I realize that you aren't recommending this to anyone
--I realize that this was an Encore and -NOT- a revolver
--I realize that I am drifting the the thread also...
Simply because I find it interesting and I would like to learn more about it, it makes me want to ask about or at least point out what the risks are when using bullets of a simpler construction for irrationally strong loads... specifically, in revolvers.
I came to this topic because I like to experiment in .327 Federal Magnum and I figured that if we can fling 85 and 100 grain bullets past 1,600 and 1,500 FPS without trying too hard, than the "sky is the limit" with 71gr and 60gr pills made for the .32 ACP as these bullets are the same diameter.
I elected to send an e-mail to the ATK ballisitician (Ben Amonette) and ask for some ideas and his full and firm reaction was that you are seriously risking forcing cone damage when running jacketed bullets (far!) outside their design scope in this manner. He mentioned something about the jacket distorting and the forcing cone taking the brunt of this hammering. It's the reason that many of the jacketed bullet makers developed specific MAGNUM jacketed slugs in .452" for the .454 Casull and (obviously) use in the .460 S&W Magnum. He cautioned me against trying for mindblowing velocities with light bullets in .327 Federal for exactly the same reasons.
These days, I run a Winchester 71gr FMJ (.32 ACP pill) from my 4.2" .327-chambered GP-100 at a chrono'd 1,330 FPS. That's already far beyond what any .32 ACP load could even imagine doing with that slug, and it's a fun, accurate load. It certainly won't drop steel plates with much authority (but it WILL drop most of them!) but it does punch nice groups in paper and it's enjoyable to shoot. My main purpose? I happen to have a LOT of the slugs and jacketed .312" bullets are expensive and these were not.
So yeah, major thread drift, but my point is the same. I like the discussion, but when I read what you did (with great interest! ) I also want to caution anyone with an X-frame .460 Magnum about the kind of thing they MAY be doing if they wish to replicate your adventures.