Case forming 7.65 Argentine from 30-06. Which die works?

[vintage hunter]

Are you lubing the inside of the case neck before running it through the sizing die? If not the expander may be stretching the shoulder enough to prevent chambering.
And I assume you're using a FL sizing die and not a neck sizer?
I never used a form die when converting 30-06 and similar brass to 7.65x53mm. I just lubed the cases good inside and out, ran them through an RCBS FL sizing die, rough trimmed, annealed, final sized/trimmed and loaded. Never had any not chamber or give any other troubles. I'm still loading some that I made up 25 years ago.
I preferred Remington or Winchester cases, Federal and military brass was thicker and sometimes required neck reaming.

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[Parashooter]

. . . I never used a form die when converting 30-06 and similar brass to 7.65x53mm. I just lubed the cases good inside and out, ran them through an RCBS FL sizing die, rough trimmed, annealed, final sized/trimmed and loaded. Never had any not chamber or give any other troubles. I'm still loading some that I made up 25 years ago.

Yup, same here - except I never found a need to anneal these until after a half-dozen or so reloads. (Also never had brass so thick or chamber so tight as to need neck-reaming.)


US military .30/06 anneal extends far enough to include 7.65 shoulder.

I'd venture that mrappe's problem might be traced to press spring during the FL sizing operation, perhaps combined with inadequate case lube. This can be addressed by adjusting FL sizer down about 1/8+ turn beyond no-load shellholder contact, and using castor oil as sizing lube.


Visible gap during actual sizing indicates die might need to be adjusted down to compensate for press flex.