Erratic grouping

[Brian Dick]

The Remington UMC as Ridolpho suggested, is the closest commercial equivalent to Mk.7z and very good. I think Cold Zero uses it too with great results. I had some Winchester "white box" made on contract in 1981 that was Mk.7z spec but you can't find it anymore. I wish Winchester would produce it again. I'm seeing a few problems in rifles sent here caused by the S&B and PPU Mk.8 spec stuff. Usually inconsistent primers but no fault of the rifle's. I understand guys who don't reload having to shoot what they can find. I just had a local fellow bring me a recently imported 1936 Ishapore Mk.III for service that's been through Indian rebuild but has sound woodwork and is matching. It passes the .074 no-go gauge and is in spec with the run gauges but the barrel swallowed the .310 erosion gauge in the throat/leade well past the 1/4" mark so he'll be needing some flat base projectiles for sure!