Originally Posted by tbrice23
I've recently got some loose primer pockets in my winchester 300wm brass and it seems WLRM primers fit more loosely than cci250 or f215m. Looking closer I've found WLR is smaller diameter than cci200 cci br2 f210m. Looks like the chart contradicts my findings. Dont know how old the chart is but maybe specs may have shifted slightly.
Does this sound right?
I agree with ...
Originally Posted by Lefty7mmstw
they are both large rifle, but there is a slight amount ( thou. or so) of tolerance in size with primers. Usually loose pockets= hot loads, especially if you aren't getting better than three firings before looseness.
It is not as tight of a tolerance as one would think or hope for, it's probably around a +/- .0015" range. Having said that, if you take the large rifle B diameter of the 6 on chart, it'll yield ...
Most of my brass are Winchester and I get at least 5-6 firings without experiencing loose primers problem and regardless of primers used. I have all the primers on the chart but I prefer the CCIs (200, BR2, 250) for most of my LR loads.
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