380 Auto Pull-Down

[The_Shadow]

Cartridge is from Ammo Manufacture: Buffalo Bore 80 gr +P Barnes TAC-XP solid copper  (provided by Patrick)
Ballistics Information: 380 Auto
Muzzle Velocity: 1275 fps
Muzzle Energy: 289 ft. lbs
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.5260"/Dia. 0.3540": Barnes 80gr TAC-XP 100% Copper
HP depth 0.2800" / HP 0.1730" / Mouth 0.2300"
Actual weight 79.8 grains (flat base) Crimp line 0.3530"
C.O.A.L.: 0.9475"  **
Primer: Small Pistol Brass color
Case: Diameter 0.3705" Crimp Diameter 0.3715" Length 0.6740"
Powder Description/Positive ID/Type/Charge Weight:  AutoComp  4.6 grains *

*Hodgdon shows the Barnes 80gr TAC-XP 100% Copper loaded with AutoComp
3.8 grains @ 1024 fps 20,200 psi

**Also when I reloaded these,I had to question the seating depth Buffalo Bore is using on these, while the Cast lead bullet was understandable as getting the bullet seated with the lube groove below below the case mouth, the Barnes bullet was seat to the same depth practically.  However the Cartridge Over All Length is 0.9840" and the Barnes Bullet is in my opinion seated too deep!

[The_Shadow]

Cartridge is from Ammo Manufacture: Buffalo Bore 100 gr +P Hard Cast Flat Nose  (provided by Patrick)
Ballistics Information: 380 Auto
Muzzle Velocity: 1150 fps
Muzzle Energy: 294 ft. lbs
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.4660"/Dia. 0.3550": HC 100 gr. FN
MEPLAT 0.2300"
Actual weight 99.8 grains (flat base) Crimp line N/A
C.O.A.L.: 0.9460" 
Primer: Small Pistol Brass color
Case: Diameter 0.3705" Crimp Diameter 0.3710" Length 0.6760"
Powder Description/Positive ID/Type/Charge Weight:  AutoComp  4.6 grains *

*Hodgdon shows the 100 gr FMJ using 4.2gr @ 934 fps 14,400 C.U.P.

[Intercooler]

  If it worked well in 9mm, just figured this would be the .380 powder too.

[The_Shadow]

380 Automatic SAAMI pressure info
100 FMJ @ 910 fps 21,500 psi (MAP) / 22,200 psi (MPLM) / 23,200 psi (MPSM)

Made a correction had data for 38 Auto prior

[The_Shadow]

I edited the original Barnes 80gr posting to add this...

**Also when I reloaded these,I had to question the seating depth Buffalo Bore is using on these, while the Cast lead bullet was understandable as getting the bullet seated with the lube groove below below the case mouth, the Barnes bullet was seat to the same depth practically.  However the Cartridge Over All Length is 0.9840" and the Barnes Bullet is in my opinion seated too deep!

[The_Shadow]

Cartridge is from Ammo Manufacture: Hornady Critical Defense 90 gr Flex Tip JHP
Ballistics Information: 380 Auto
Muzzle Velocity: 1000 fps
Muzzle Energy: 200 ft. lbs
Brass Make/Headstamp: Hornady – Nickle
Bullet Make/Weight/Construction/Info; Length 0.4875"/Dia. 0.3545": Hornady 90gr Flex Tip JHP
HP depth (N/A Flex Tip) / HP 0.1500" / Mouth 0.1890"
Actual weight 90.0 grains (flat base) Cannelure Crimp line 0.3500"
C.O.A.L.: 0.9695" (without compressing the flex tip)(0.9560" @ the copper HP) 
Primer: Small Pistol Nickle color
Case: Diameter 0.3705" Crimp Diameter 0.3695" Length 0.6740"
Powder Description/Positive ID/Type/Charge Weight:  BE-86  3.2 grains

[Ryushin]

Anyone have any 380 Underwood Extreme Penetrator that they can do a pull down on.  It would be nice to see the standard and the +p version.

[The_Shadow]

I wish I had some to document them, it would be interesting to see what's yielding those numbers! 
The pressures need to be safe as lack of case support or poor quality brass could lead to a case failure...

[Ryushin]

I wish I had some to document them, it would be interesting to see what's yielding those numbers! 
The pressures need to be safe as lack of case support or poor quality brass could lead to a case failure...

I agree. The velocity seems much higher then anything else I've found.  1100fps for the standard and 1200 for the +p version is quite a bit faster then any other published loads that I've found so far.

[Intercooler]

AutoComp?

[Ryushin]

Autocomp looks to be an excellent powder.  But as noted above, it sure seems that Doubletap is going quite a bit above the pressure limit of 380.  Worried about working up load as it might be much harder to see pressure signs compared to higher pressure rounds like 10mm/9mm/10mmShort.

[The_Shadow]

Ryushin, I can atest to pressures getting up there, I push a little too hard on my 380 with brass that was less than ideal and had a casing failure in my Ruger LCP.   http://10mm-firearms.com/range-reports/380acp-blown-up!/
There were several factors that led up to this failure;
1st) I push too hot a load to start with using a heavy cast HP 128 grain.
2nd) I was using range brass one was PPC the other was MFS which was the one that blew out.  It has a different style base inside.

[Ryushin]

Ryushin, I can atest to pressures getting up there, I push a little too hard on my 380 with brass that was less than ideal and had a casing failure in my Ruger LCP.   http://10mm-firearms.com/range-reports/380acp-blown-up!/
There were several factors that led up to this failure;
1st) I push too hot a load to start with using a heavy cast HP 128 grain.
2nd) I was using range brass one was PPC the other was MFS which was the one that blew out.  It has a different style base inside.

Good read.  I was planning on using unfired starline brass for self defense handloads.  I have some autocomp so maybe I should order some bullets and work up a load.  Still, it would be nice to see what Underwood is using as a baseline.