Cartridge is from Ammo Manufacture: Buffalo Bore Barnes 155gr TAC-XP
Ballistics Information: 10mm Auto
Muzzle Velocity: 1500 fps
Muzzle Energy: 774 ft. lbs
This is a full power 10MM load that is within SAAMI spec and is thus safe for use in ANY/ALL 10mm pistols. Loading this long-for-weight all copper bullet in the 10MM case, causes powder capacity limitations that we do not experience with shorter/heavier lead alloy bullets and thus our advertised 1500 fps velocity cannot be reached, regardless of how may internal ballistics charts tell us that we should be able to launch a 155gr. bullet @ 1500 fps from a 5 inch barrel, that long light weight bullet simply uses too much of the available case capacity to do so.
1455 fps - Custom 1911 with Nowlin 5 inch barrel Energy 728 ft.lbs
1429 fps - Colt Delta Elite, 5 inch barrel Energy 702 ft.lbs
1401 fps - Glock Mod 20, 4.6 inch barrel Energy 675 ft.lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: Star Line - Brass
Bullet Make/Weight/Construction/Info; Length 0.7340"/Dia. 0.3995": 155gr. TAC-XP
Actual weigh 154.6 grains Crimp Diameter 0.3995"
HP Dia 0.2270" HP Depth 0.3735" Mouth 0.2710"
C.O.A.L.: 1.2380" / 1.2380"
Primer: Nickel color
Case: Diameter 0.42150" Crimp Diameter 0.4210" Length 0.9880"
Powder Description/Positive ID/Type/Charge Weight: Power Pistol 11.0 grains
Powder was jamb packed tight, had to scrap it out to get the weight.
(https://s20.postimg.cc/8i50nsdl9/IMG_0118_zpsac91d959.jpg)
(https://s20.postimg.cc/tf18sgr1p/IMG_0119_zpsad34925e.jpg)
(https://i.postimg.cc/3JQ4ysjZ/IMG-0120-zps44bb3eeb.jpg)
(https://s20.postimg.cc/qky3f0h5p/IMG_0124_zpsf2cf99f6.jpg)
(https://s20.postimg.cc/60t9gjojx/IMG_0123_zpsd9574b12.jpg)
Great 8)
The numbers I got with the Pro as usual line up with Buffalo Bore's testing. Wonder why Double Tap can't ever do this? :-X
Mr.Redbull was right about being 11 gr's but didn't know the powder.
I was quite surprised at just how tightly packed the power was, I had a heck of a time scrapping it out and off the casing and bullet base making sure I didn't loose any flakes. Even took a small wire to clean out the flash holes. Both were exactly 11.0 grains. 8)
My results were pretty tight too from the two I fired. No extreme spreads like the earlier test.
Quote from: The_Shadow on September 20 2013 04:44:03 PM MDT
I was quite surprised at just how tightly packed the power was, I had a heck of a time scrapping it out and off the casing and bullet base making sure I didn't loose any flakes. Even took a small wire to clean out the flash holes. Both were exactly 11.0 grains. 8)
I was going to ask about the "pilled" powder in the pic. I load mine to 1500 FPS in the 5.2" LWD, and the powder is at the limit of compression. If I tore one down, the powder would probably come out in one solid lump (I have to pre-compress to prevent bullet deformation). That said, the bullet design and lesser weight makes it very forgiving. In almost every case (using practical powders), case capacity and compressibility was exceeded long before any significant pressure indicators arrived. I tried Power Pistol, and it was at the lower end of the performance scale (~1400 FPS, as indicated by the post). Blue Dot, AA7 and Enforcer were the better choices, in that order. AA5 and 800X were a no-go, and dangerously unpredictable.