Double Tap .357 Magnum Vs. 10 MM
Here's How Double Tap .357 Magnum & 10 mm Stack Up...
1) .357 Magnum, 1600 fps, 710 ft. lbs., 125 gr Gold Dot
2) 10 mm, 1600 fps, 767 ft. lbs., 135 gr Nosler
3) .357 Magnum, 1400 fps, 688 ft. lbs., 158 gr Gold Dot
4) 10mm, 1475 fps, 750 ft. lbs, 155 gr Gold Dot
5) .357 Magnum, 1200 fps, 640 ft. lbs., 200 gr Hardcast
6) 10mm, 1300 fps, 750 ft. lbs., 200 gr Hardcast
Safe To Say...
10 mm = To .44 Magnum? No!
10 mm = To .41 Magnum? Maybe...
10 mm = To .357 Magnum? Hell, yes!
I shoot 10 mm with my G21 and a KKM Conversion Barrel. The entire conversion "kit" consists of:
. KKM .45 ACP : 10 mm Conversion Barrel
. 10 mm Magazines
. LWD Stainless Steel Guide Rod
. LWD 22 lb. Spring
No other changes (extractors, etc.) required. The conversion can be done in seconds right at the range, with drop in parts.
Reliability in 10 mm mode is 90% +, so far, but I'm still tweaking it.
Note: Reliability in .45 ACP mode is 100%
My favorite load is the Double Tap 135 grain Nosler, at 1600 fps, and 767 ft/lbs
I'm going to try a 20 lb. spring, and see if that eliminates the occasional fail-to feed with that ammo.
No other problems to report...
The conversion got me into a caliber I won't shoot too often, at about 1/2 the cost of a new 10 mm rig.
--Ray