Hi JonWelcome to the forum as it is the best on the net. Would love to see pics of the enfield and the cz. What is a 6.5 epps? What parent cartridge is it?
The 6.5 Epps is a 303 Brit necked down and ackley improved so to speak. Min body taper, shoulder angle 35 degrees, and moved forward close to an 1/8". Was design by a gunsmith in Canada by Ellwood Epps and they say with the help of Mr Ackley.