Well Keg, you may well be right in that their data is a bit hot, maybe even a lot hot for some guns. I loaded up 5 ea with 40gr Vmax and the Li'l Gun I bought for it, sometime around 5-6 yrs ago. Looking all through all the date I could find, decided on 13.0gr to start with. Supposed to be about 3100 with a max load at 14.5. Used a Magnetospeed V3 to do these. Stevens 044-1/2 w/ 24" RKS on it. All partial FLS'd.
First shot @ 13.0 was 3252, no apparent pressure signs, all 5 were fine, and holding nice in the 3225 to 3250 range. next was 13.2, clocked 3328,3337, 3370, round cornered primers, but, flattened a hair, then I went to 13.5, 3390, 3391,3409 and 3424, and got some really flat primers, right to the edges. Didn't bother with any more shots on the heavier charges. Bees are not supposed to go quite that fast. That was indoors, about 60-65deg. So, ya, I'd rate that powder as faster than advertised and shown in their data. The 13.0gr load was fine on what I checked, I haven't checked the base expansion or primer pockets yet on the 13.5 loads.
Also ran some AA1680, which is a new purchase, a couple of months ago, their data was pretty much bang on, same bullet, 40gr Vmax, ran 14.0 to 14.7gr, got 2805 to 2840 and zero pressure indicators.
As to the case separations you had, it could be your brass, it could be the gun, I'd be checking out the gun with a different powder like 1680 and the brass , before loading it, with a paperclip for signs of internal stretch rings starting.
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