>My own observations may border on heresy, but I believe that the more we approach what I'll call a 'perfectly tuneable' case (for whatever bore size), the less forgiving they tend to be. While the 'perfectly tuneable' case will respond to every little tweak you give it, and show the results on target, that is also the thing that makes keeping them in tune so difficult. Now, I'm not saying that the 30BR is one of these, but it's interesting to me that the larger case .30's (ie: HBR cases of 45.5 or more capacity) hold on to their tuneup through wide temperature swings and humidity changes.<

Al, I HAD to respond to even the HINT of the .30BR not being as forgiving as the HBR capacity cartridges - my experience has been that within this capacity range, and over a wide range of temteratures and varying humidities, consistent performance is the NORM !   One simply tunes the rifle to shoot and then goes about ones business . . .

I'd point to the .30BRs having also negotiated the Mainville two hundred pretty well as evidence of this - none of the users with  whom I talked altered their load, or for that matter, even considered tampering with what "weren't broke"! For six full seasons, in conditions ranging from Pariried Dog Target Club (simi-arid prairie) during the HOT summer, to Mainvillle, to Twenty Deg.  (warm) winter  Iowa days, the .30BR cartridge has performed with a renlentless affinity for the X! In my experience, there is nothing finicky about it - the same load I used at the IA State group Championships (.254 100 Yd Agg.) during July, shot a 250-22X at Mainville . .and another 22x on a blustery 35 Deg. day a couple of weeks ago; typical 30BR performance . . .

" . . . .but it's interesting to me that the larger case .30's (ie: HBR cases of 45.5 or more capacity) hold on to their tuneup through wide temperature swings and humidity changes." Count the BR (thirty caliber version) IN on this!

Keep 'em ON the X! R.G.