I’ve recently proposed two cartridges - the now-dead 6mm Remington - and the 7mm-08 Remington - for the “Ackley Treatment”. The 6mm began as the “.244 Remington” to compete with the .243 Winchester - both debuted in 1955. Due to its longer case and larger capacity, the .244 OUT-PERFORMED the .243 by as much as 100 fps with lighter bullets, but failed to stabilize the heavier 75- to 90-grainers back then, due to the 1:12 twist-rate in the Remington rifles - Winchester used a 1:10 rate, which they’ve stayed with as their standard over the years. Remington farted around until 1963 to re-barrel their rifles with a faster 1:9 rate, and re-named the cartridge the “6mm Remington”, but the damage had long-been done - It had been entirely eclipsed by the .243. Remington went on to piss-pathetically mismanage Keith’s .41 caliber project in 1964. Ackley Improved versions of a resurrected 6mm and the 7mm-08 would produce two OUTSTANDING short-action sporting rounds, and could be alternatives for military consideration. PERIOD
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CORRECTION: I should’ve described the 6mm Remington as a LONG-dead cartridge - rifles have ceased to be manufactured for it since the '90’s - you can get them now only thru custom or boutique makers. I’m waiting to see if the “6mm Nosler” and the “7mm-08 Nosler” become realities, and if SOMEONE will finally take the .41 Special to SAAMI to standardize this fine revolver cartridge. The “flagship” revolver I’ve designed for it will probably never be made.