MachIVshooter
Member
The .40 Super drove a 135 grain bullet to 1,800 feet per second
That's very impressive.
Yeah......and those 135's blow up coming out of a 10mm at 1,650. Trust me.
I can get .357 mag energy out of a 9x19mm using really light bullets (90 gr.). I was getting them to 1,680 FPS from a 4.5" tube for 560 ft/lbs. That doesn't mean they perform well..........
I can't find anywhere that shows 10mm numbers being close to that of the 40 super.
I found a tons of videos that show 10mm being weaker than the numbers floating out there on the web.
ex:http://www.youtube.com/watch?v=GjhupTsuolo Apparently Double Taps that are rated at 1400 fps averages only 1150 fps.
The 10mm is a 750-800 ft/lb cartridge using appropriate 180-200 gr. bullets in a 5" gun. My standard carry load is a 180 gr. Remington Golden Sabre that leaves the muzzle of my S&W 1006's 5" barrel at 1,406 FPS average for 792 ft/lbs.
If you're considering the .40 Super, you need to be looking at the same bullet weights; The 165 & lighter are too lightly constructed for 10mm or .40 Super velocities. I know that 135 gr./1,800 FPS looks impressive, but I, for one, would not carry it. The same company that boasts that load shows a 200 gr. @ 1,300 for 750 ft/lbs. That's a ballistic twin for hot 10mm loads.
IMO, the 10mm is a better option. It has far better ammo and component availability (and that's saying a lot, since 10mm isn't exactly a Wal-Mart item), and the G20 mags holds more ammunition than a G21 mag with .40 super in it.
By all means, do what you want. But it seems to me that you'll end up with something that's expensive and difficult to feed and beating itself up pretty badly if you use those light/fast loads.
And BTW, the .40 Super, .460 Rowland, etc. really don't compare to a .44 mag. 1,000 ft/lbs is a very modest .44 mag load. BB has stuff besting 1,500 ft/lbs from a 6" revolver.
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