drew at barking moonbat is really a very talented cartridge designer. he was of immense help to me when i built my ar-15 in the .284 caliber "jj's brit" in projecting load performance and pressures for that cartridge.
well, he's at it again, and, so am i. he's drawn up some cartridge designs in .375 caliber, based and short cartridges of pistol length, and noted that they would make fine performers in an ar-15 pistol platform. http://www.barking-moonbat.com/index.php/weblog/just_playing_with_guns_again/ .
i happen to agree. http://www.barking-moonbat.com/index.php/weblog/freedom_in_the_sawdust/ . and, i've been working along the same line, proposing a .375" cartridge built on a 6.8mm rem spc cut to around 1.300" in caselength, and loaded moderately to around 1400 or 1500 fps from a 10" barrel, on the ar-15 platform.
both of drew's proposed cartridges feature longer cases, and he is expecting commensurately greater performance from his cartridges, ballistics suitable perhaps for deer and other game. i am thinking of milder performance, and fewer legs, something to supplant the .45 acp as a sub gun round.
i suggest that you go to barking-moonbat at http://www.barking-moonbat.com/index.php/weblog/just_playing_with_guns_again/, and take a look. he does very good work. and, oh yes, his opinions on ballistic & performance matters are backed up w/ very careful analysis using the quick load program.
all in all, very interesting.
john jay @ 10.30.2015