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SMC cartridge design

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Unread 02-22-2004, 04:14 AM
Bronze Member
Join Date: Jul 2003
Location: Christchurch New Zealand
Posts: 39
SMC cartridge design

Has anyone looked at this design or experimented with any of them. It is a joint cartridge design concept of Byron Smalley (he retired from designing solid fuel rockets for the company that supplies the boosters for the space shuttles) and Mic Mcpherson. The design is based around the inside diameter of the case at the shoulder is twice the diameter of the bullet. The shoulder is shaped into a parabolic curve, the idea being that the primer blast is focussed by reflection (think of the filament of a headlight bulb as the focal point) into a spot just behind the bullet base delaying the onset of bullet movement from the case and improving combustion efficiency.
From a theory point of view I like the concept and based on preliminary results for a 22SMC with similar case capacity to a 22-250 and a 6.5SMC with a similar case capacity to the 6.5/284 the idea shows promise.
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Unread 02-22-2004, 04:18 AM
Silver Member
Join Date: Jul 2002
Location: France
Posts: 390
Re: SMC cartridge design

I have meet MacPherson at the Shot show and see some cartridge stample , design seem very interesting and with CNC ground reamer that allow repetitive headspace on curve surface ( reamer / headspace gauge matching )

I will set a barrel in 6.5 cal soon with this design for test and after macPherson agreement because that a patent design .

good shooting

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