7.62x54R to 8x58 Danish Krag

[scairns]

Need some advice from some of you with a lot more experience than I. I recently picked up an old rolling block, in 8x58 Danish Krag. Obviously brass is going to be a bit of a challenge, though I understand they can be bought out of the states, and formed out of 45-90 brass. I have dimensions for the cartridge from Catridges of the world, and I did a chamber cast. I had a round of fired 7.62x54r sitting on the bench and measured it up 'cause it looked close....

8x58 CoW Chamber 7.62 Measured 7.62CoW
Shoulder .460 .459 .461 .453
Base .500 .499 .489 .484
Rim .571 .574 .563 .564
Length 2.28 2.300(est) 2.119 2.110

So my question, can I neck the 7.64x54r up and then fire form it to make a 8x58 (albiet .140 short)? I am concerned about the 0.010" difference in the base diameter....can a guy get away stretching the base of the cartridge 0.010" to the chamber???

 

[Andy]

Use 8x56R. I have done the 45/90 thing and it is a lot of expense and work for no practical benefit. The 8x56R is simply size and use. The base is a bit undersized, but you will be keeping pressures to 28K max, so there will be no problem. I've shot 0.010"+ undersized brass at twice that pressure five times with no problem (using 30/06 brass for 8x63 Swedish).

See here for more: http://castboolits.gunloads.com/showthread.php?t=22807

Grafs makes 8x56R. I get mine from http://www.macsguns.com/ I ordered some brass last night in fact.

 

[scairns]

Thanks Andy!