40SW cast bullet ??

[bheadboy]

non rifle ? I have a Walther ppq in 40 sw, reg rifling, shoot jacked stuff great one ragged hole,

I have tried the RCBS 180 cast bullet sized .401 in a Star sizer, and the thing k-holes!!!! at 15 yds

in my other 40s this has never happened, tried Univ 5.1 gr got 980 fps which is not outlandish,

SAECO hardness tester 6.0 = oal 1.120 win primer

I have shot 1000's cast in ipsc and bullseye - even killed deer with cast from a single action Colt and never had this over a 55 year period.

what is going on??

Bob

 

[Catfur]

Can you catch a bullet in water or something and see if it's engaging the rifling?

 

[noylj]

Are you getting any barrel leading? If so, where is it?
Have you slugged the barrel?
Keyholing: screams "Bullet is too small in diameter"
The GUN tells you what diameter to use, and yours sound like it wants a larger bullet.
Are these commercial cast bullets, and, therefore, probably at 18-22BHN? Bullets that hard really need to be at least 0.001" larger than softer lead.
If casting your own, get the alloy down to 10-13 BHN. Next, DON'T size them at all. I gave up sizing any of my cast bullets back around 1977 or so and never looked back.
Try some LLA or 45/45/10 and see how they do. Place all bullets in glass casserole dish, set bullet on side, squirt or pour a little tumble lube on them and shuffle/rotate them around for 30-60 seconds. Inspect all bullets and ensure they are shiny and wet looking but NOT discolored (NOT amber/brown). Dry over night.
If you can't stand the thought of not sizing the bullets, then get a 0.402 or 0.403" sizing die.
Or, get coated bullets from Precision Bullets of Kemp, TX.

 

[FN in MT]

Also how much taper crimp are you applying? I've seen excessive crimping size bullets down.

I'd bet you need to go .402" as well as SOFTER.