Ok I'm going to be controversial here on this subject...if your mk2 is in good nick nothing wrong with full length sizing. 303 dies were hard to come by a just a few years back, couldn't find any neck size dies, set of RCBS was all I could find from Gunworks.
Anyway I tried partially sizing with F/L die, was a pain so just F/L sized as I do with other cartridges. I've had no trouble whatsoever. My PPU is probably up to 5 firings, but mainly using Greek as does look heavier, probably simular 5x plus no issues.
This neck sizing I think is for flogged out 3'O's. If its a good one just load it like any other rifle
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