Back when we manufactured the heads the "target" most of the time was 1.5 inch diameter, 165 grains without adaptor. The 195 gr heads were these with a screw in adaptor. Keep in mind that 1. we manufactured these heads over a 20 year period with many refinements in the process over the years so there were variations depending on when they were made and
2. we did the best we could with quality control, but we primarily looked for strength and straightness....grain wt within 20 grains or so didn't even hit the radar. Back then the only guys with grain scales were reloaders. 20 grain variation in broadhead wt did not (and still DOES NOT) effect accuracy enough for 99.9% of people to notice so it SHOULD be a non-issue. Frankly this level of QC within the complex process of manufacturing a big, strong, sharpen-yourself type broadhead is VERY good.
As to the current production, my understanding is the target is 160 gr without adaptor and 1 7/16 diameter...virtually the same as our "target" size was. As stated above, Mike's process/heads are as good or better than anything we built back in the day.
Ryan