Winchester .40 S&W 165gr PDX1 Defender

[RDub01]

Cartridge is from Ammo Manufacture: Winchester
Muzzle Velocity; Advertised:   1140 fps
Actual Instrumental Velocity:  1149 fps
Muzzle Energy; Advertised:    476 ft/lbs
Brass Make/Head stamp:     Winchester .40 S&W
Bullet Make/Weight/Construction/Info:  Winchester 165grs. JHP  .3994" dia.  .585" long
Actual Weight:   165.5 grs.
Crimp diameter:     .4236, .4206, .4207, .4228, .4222"
C.O.A.L.:   1.126"
Primer:  WSP
Case:  Nickel
Powder Description/Positive ID/Type/Charge Weight:  Flattened ball; 7.5grs. WSF?

Not very consistent crimping.  Snappy recoil.
The very first round at the range chambered to fire was a dud.. bad primer.  Took it home, disassembled and put a new WSP primer back in and fired it just fine.
Shoots low and left in my gun.

[The_Shadow]

RDub, compare that powder to Silhouette which is what use to be Winchester WAP (Action Pistol)

155 grain JHP using WAP 7.4 grains @ 1170 fps 33,500 psi
170 grain JHP using WAP 6.7 grains @ 1085 fps 33,500 psi

But I have a hunch that Winchester is loading that one with the Newer AutoComp powder.

Autocomp 7.1 grains @ 1124 fps 31,500 psi

This is a sample of my AutoComp powder

[RDub01]

I took some pics of WSF, AutoComp, and Silhouette.

WSF;



AutoComp;



Silhouette;



Winchester factory;


Looks like AutoComp is the closest match. Although the factory powder kernels vary in size greatly.  The AutoComp kernels vary in size also, but not nearly as much as the factory sample.  Interesting stuff..

[The_Shadow]

When you look at the max loads of each powder Auto Comp seems to be the closest fit for the yield velocity...

Snapshot of Hodgdon's data for 165 grain Sierra JHP



Older Winchester Data (WAP = Silhouette)