Double Tap 180gr Nosler JHP Pull-Down

[The_Shadow]

Cartridge is from Ammo Manufacture: Double Tap 180gr  Nosler JHP
Ballistics Information: 10mm Auto
Muzzle Velocity: 1305 fps
Muzzle Energy: 680 ft. lbs
Brass Make/Headstamp: Double Tap-Nickel
Bullet Make/Weight/Construction/Info; Length 0.6170"/Dia. 0.3995": 180gr. Nosler  JHP 
HP depth 0.2050" / inside Dia. 0.1175" / mouth Dia. 0.2050"
Actual weight 180.2 grains   Crimp squeezed bullet to 0.3895"
C.O.A.L.: 1.2470"
Primer: Nickel color
Case: Diameter 0.4205" Crimp Diameter 0.4180" (Tight) Length 0.9910"
Powder Description/Positive ID/Type/Charge LongShot Weight: 9.0 grains

[Intercooler]

These must be older. All the current ammo has a rating from a 5" barrel instead of 4.6". Where should they fall? I have a couple of their 180's I personally tested listed on the sheet. Both were about 1300 FPS. Haven't done these 

[REDLINE]

Looks like a roll crimp.  Probably just the pic playing tricks with my eyes.  But yeah, that is a tight crimp.

[The_Shadow]

The measurement was in the original post...Crimp squeezed bullet to 0.3895"

[REDLINE]

I know we can only speculate, but I wonder why DT is crimping so much.  If it's just "playing it safe", or what, who knows.  Does leave me curious though.