OK after earlier discussions I slugged my barrels on the win 94's and they came out .309" while my old O3A3 was .308". so I polished my LEE sizer die out- a little too much naturally, throwing them right at .310" . I figured a little over is better than under and I had to use several coats of Hitec on the 173 grain flat nose I'm casting from a LEE mold to consistently get that. all seemed well and I have experimented with copper gas checks and some aluminum ones a friend has been making. I had mixed results with dirty bore on the winchesters after 10 rounds or so and quickly get into hard chambering after 7 or 8 rounds of about 10 grains of unique. my old O3A3 with it's nearly new 2 groove barrel shoots a 14 grain unique load very nicely but as the others after 8 to 10 rounds chambering becomes very hard.I measured the OD of the neck with the .310 bullet diameter in them and they are running right at .338" . my old Lyman manual doesn't give me that maximum diameter. the first few though, chamber and shoot fine. I have neck trimmed to .010 below max case length and the O6 rounds are going 3.230" length loaded which is which is well under the max loaded length in order to get the first 2 driving bands into the case. They feed nicely from the magazine and show no signs of interference on the lands. I'm satisfied with the grouping with the stock sights on the O3 but I kinda wanted to shoot a 50 round match with it just for fun and that ain't gonna happen at this rate. I'm not using lube other than the Hitec coating.I recovered one from the dirt bank after shooting at 80 plus yards and it mushroomed very well and the copper gas check stayed on and what base still showing looked very clean as far as engraving. it would make a fine 100 yard hunting load I'm sure.but I want to punch paper for fun