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Ariska rechambered?
Hi all!
Can anybody verify what this Ariska was rechambered for?
The stamp reads:257.6.5 IMP
Thanks,
Chris having probs resizing pic of chamber stamp.
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07-04-2015 05:43 PM
# ADS
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Likely .257 Roberts which was changed to use a 6.5mm bullet. Some type 38s were rechambered to this as 6.5x50SR was pretty rare post WWII but .257 could be found.
Likely what the chamber reading means is 257 Roberts 6.5mm bullet (because the actual .257 Roberts used a smaller diameter bullet) Improvised (which is because it is using a 6.5mm bullet instead of the .257 bullet).
Last edited by Eaglelord17; 07-05-2015 at 01:30 AM.
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And the 6.5 "Roberts wildcat" is VERY close to the old Mauser 6.5 x 57 sporting cartridge of way-back when. Not entirely surprising given that the .257 Roberts was derived from the Mauser series cartridges. Be aware that there are "subtle" differences in dimensions around the shoulder that need to be carefully addressed when forming one from another. It should NOT to be confused with the 6.5 x 55 Swede/Norwegian or the 1904 6.5 x 58 Portuguese Mauser Vigueiro.
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Originally Posted by
Eaglelord17
Likely what the chamber reading means is 257 Roberts 6.5mm bullet (because the actual .257 Roberts used a smaller diameter bullet) Improvised (which is because it is using a 6.5mm bullet instead of the .257 bullet).
The OP hasn't been back but I'll share this anyway just in case he does. There is such a thing as a .257 Roberts Improved. There's several versions, the Ackley being most popular. So, I take the .257/6.5 IMP barrel markings to mean the rifle was re-chambered for a wildcatted wildcat round based a .257 Roberts IMP case necked up to accept 6.5mm bullets.
Originally Posted by
Bruce_in_Oz
Be aware that there are "subtle" differences in dimensions around the shoulder that need to be carefully addressed when forming one from another.
You are correct regarding the subtle shoulder differences but the accepted method for forming .257 IMP cases is to simply fire standard .257 Roberts ammunition in an improved chamber. Same for forming 6.5/257 Jap cases, and some even report useable accuracy at moderate ranges despite the undersized .257'' bullets.
Last edited by vintage hunter; 07-19-2015 at 12:04 AM.
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