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You will find an issue with R-P or Win brass. They use the standard head diameter of ~.473 at the rim and ~.471 at the beginning of the brass.* 6.5 Swede runs ~.480 at the rim and ~.477 at the beginnig of the brass.* That .006" difference in the head will cause premature brass failure; especially if you full length size. If you want a good chance at decent case life, use Privi, Norma, or Lapua as they are much closer to spec.
To quote from Volume 1 Handbook for Shooters and Reloaders by P.O. Ackley
Copyright 1962 Plaza Publishing 1848 West 2300 South Salt Lake City Utah.
Page 359.
From Paragraph 1
Some difficulty is experienced when attempting to rechamber the original barrels for wildcat cartridges based on standard American cartridges like the 30/06, because the 6.5X55 chamber is somewhat larger near the base causing a sloppy condition, when standard cases are chambered.
P2
Many use ammunition made from American brass, such as the 30/06, 257, 7MM, etc., but it could hardly be called a safe practice.
End quote.
* Dimensions courtesy of Lyman Loading Handbook 49th edition.
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