Lots of interesting discussion here. Especially interested in 7.5fk round, I'm really hoping the market picks that up and we see caliber conversions/mags and ammo become more and more available.
Anyone here mess with 960 rowland? Seems like a really interesting "barrel only" conversion. Seen load testing out there where shorter 108grn bullets are pushing high 1400/low 1500 fps. Lighter solid copper bullets could be pushed faster, clearly, and I personally am a fan of velocity.
So effectively its the same as the 960 rowland, without the 9x23 winchester brass, which was brought up earlier in this thread?
Other than a barrel with a chamber rated for the extra pressure, how would one correctly calculate a replacement recoil spring to prevent premature unlocking of a browning action? E.g. barrel and recoil spring replacement for a commercial pistol.
Are saboted rounds in a straight wallee cartridge completely out as a topic in this thread? Streloks seem to be consistently circling back to .30carbine/.312 bullets as a sweetspot for energy, sectional density, recoil, ballistics, etc. Why not a high pressure .40cal case, with a thin injection molded sabot to cradle a .312 bullet (fmj, sp, LeHigh cavitator, etc). Increased case capacity, .40 doesnt present the same mag width to length 10mm does, and should still result in increased case capacity over a 9mm. With no necking necessary, and .40 brass already being mass produced, it's easy enough to produce.
The usual issues with saboted rounds exist, but the wall thickness of the sabot only needs to be about 0.055", which should minimize the risk of a bullet being mis-centered in the bore(right), while also not adding much weight to the bullet.
There was a thread on another board earlier, where an anon posted a question about injection molding THV/Lehigh cavitator projectiles with a material like rugers arx bullets, a copper dust/polymer mix.
I came across this video, where .357sig xtreme penetrator is hitting 2100+ fps consistently from a pistol.
https://m.youtube.com/watch?v=rFepaP_dFG4
From 9:31 on. Thats AR pistol length bbl energy levels from a pistol. Realistically, how quickly is that bullet losing energy, compared to a stubby barreled 5.56?