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Scorch · November 26, 2007, 03:09 PM

6.5X257 Roberts IS NOT the same as 6.5X57. The Roberts case has a 20*45' shoulder and a 1.912" datum measuremebt, as does the 6.5X257 Roberts, whereas the 6.5X57 has a 18*55' shoulder and a 1.941" datum measurement. They are not the same round!!

6.5X257 Roberts is a wildcat round designed in the 1950s, and 6.5X57 Mauser is one of the oldest rounds chambered by anyone (having been designed in 1895). Both are based on a necked down 7X57 case, but they are not identical!

November 26, 2007, 03:09 PM	#7
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	6.5X257 Roberts IS NOT the same as 6.5X57. The Roberts case has a 2045' shoulder and a 1.912" datum measuremebt, as does the 6.5X257 Roberts, whereas the 6.5X57 has a 1855' shoulder and a 1.941" datum measurement. They are not the same round!! 6.5X257 Roberts is a wildcat round designed in the 1950s, and 6.5X57 Mauser is one of the oldest rounds chambered by anyone (having been designed in 1895). Both are based on a necked down 7X57 case, but they are not identical! __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services