Found a knackered Heym SR20 L/H in 7x57. Is the 7x57 a long action ? Could I re-barrel it to 7x64 ?
The C.O.L for a heavy bulleted 7x57 is 3.0"/76mm, 7x64 3.3"/84mm ie an extra 8mm. Would the 7x57 action be able to cycle the 7x64 and would the cartridges fit in the magazine ? Anyone got a Heym in 7x57 and can you measure it?