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barnbwt · March 10, 2013, 09:49 PM

I'm looking for information on the special chamber the Swiss put into these guns. In addition to the G3-style fluting, there's an extra step at the shoulder that aids function, but I have no clue on the dimensions. I have a really good reproduction PE57 barrel in 308, but I'm set on chambering the rifle in 7.5Swiss as was intended (and so I don't have to modify anything but the reproduction barrel).

From the fire-formed brass I've seen, it looks like the step could be cut into a standard 7.5Swiss reamer to get the needed profile. I've read accounts of fluting being cut with a simple jig and a diamond burr (slow, but careful) turning out excellent results.

TCB

March 10, 2013, 09:49 PM	#1
barnbwt Senior Member Join Date: May 17, 2012 Posts: 1,085	Anyone Here Own a PE57 or STGW57? I'm looking for information on the special chamber the Swiss put into these guns. In addition to the G3-style fluting, there's an extra step at the shoulder that aids function, but I have no clue on the dimensions. I have a really good reproduction PE57 barrel in 308, but I'm set on chambering the rifle in 7.5Swiss as was intended (and so I don't have to modify anything but the reproduction barrel). From the fire-formed brass I've seen, it looks like the step could be cut into a standard 7.5Swiss reamer to get the needed profile. I've read accounts of fluting being cut with a simple jig and a diamond burr (slow, but careful) turning out excellent results. TCB __________________ "I don't believe that the men of the distant past were any wiser than we are today. But it does seem that their science and technology were able to accomplish much grander things." -- Alex Rosewater