Gentleman,
For the Past many months i have chronicling my experiments making .25 Stevens and Lengthened .25ACP cases from .22 Hornet Brass.
Lately I have been SUCCESSFUL in reforming a Shorter Rimless Candidate Case to my needs.
This is the 5.7x28mm Rimless 'once fired' Brass case.
Here is a photo of my 5.7x28mmRimmless Reforming to 6.35, or 6.52, x28mmSR basic cases.
Tools used and Stage samples of resizing 5.7x28mm Cartridge cases.
Back Row From Left: 5.7x28mm Shell Holder; .25ACP Shell Holder; Small Primer Pocket Swage Punch; Stripper cup with 3/16" Fender Washer attached; First Stage (.300") Carbide Resizing die; Second Stage (.288") Carbide Resizing die; Third Stage (.276"/.25ACP) Carbide Sizing die. Front Row from Left: 5.7x28mmRimless Case as Received; Neck Expanded using a .2500" diameter punch; First Stage Resize; Second Stage Resize; Third stage resize before removing Displaced/sheared bras ring form extractor groove; Finished Resized 6.35x28mmSR basic case.
These Cases are reasonable in availability and affordability at this time.
The tooling is reasonable in price as Lee Will Custom open a Standard .25ACP Carbide Sizing die to the desire dimension for a charge of $30.00 per Die and Diameter, if you do not have the die Lee will Sell one for $28.98 with Shipping extra.
Shell Holder(s) are Cheap.
The RCBS Combo 2 "Primer Pocket Swaging Tool Kit" is about $60.00 as of last I looked.
A 3/16 inch nominal Bore Fender washer is also Cheap.
A Suitable Size and length Pin Punch must be modified from Commercial available ones.
I used a 6"x3/16" Roll pin Punch turned in a lathe to taper the tip down to about .175" to clear the tapered inside of the Resized case and the body machined to clear the top threads of the Lee sizing die (the punch is use to remove the sized case from the die as it must be sized down to the Top of the Rim.
These Cases are factory Coated to reduce friction and the Coating seems to survive through my Multiple step Sizing/forming process.
Best Regards,
Chev. William