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Thread: 7.92 x 64 from 7.92 x 57?

  1. #1
    Boolit Master
    Join Date
    Apr 2005
    Location
    sulphur springs, Tx
    Posts
    993

    7.92 x 64 from 7.92 x 57?

    I was using .270 Win brass to form 7.92 x 57 for a Zastava Mauser action sporter by running the brass into a f.l. die and then using 5 gr. of 700 X to fireform the case (blowing the neck forward, if that makes sense). I am trying to use the 8mm Maximum design mould which produces a high sectional density boolit (.353) which I thought might make a nice hog boolit. I noticed the portion of the untrimmed case neck which expanded to throat diameter would allow the long boolit (1.245") to be seated with the gas check flush with the beginning (bottom) of the neck if it had expanded to the same diameter as the neck. Now this would make the cartridge a 7.92 by 57mm plus about 7mm additional neck length . Anyway, I like long necks on cast boolit bottleneck cartridges and was wondering if a new reamer would have to be made up to ream a 7.92 x 57 chamber longer (in the neck only) to allow using the full length blown out .270 case expanded to the .357" diameter of the case neck. I realize lengthening the neck would require reaming a new throat.

    So my question is, can the existing chamber be modified to allow a 7mm longer neck without having to have a complete new reamer ground? I figured John Taylor or one of the other gunsmiths might be able to answer this. Sorry for the convoluted attempt at explaining what I am trying to ask.
    Last edited by wmitty; 11-11-2019 at 01:26 PM.
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check