I have a 55 gal. drum of old AA hulls that I load to shoot in damascus Parkers with 2 5/8" chambers. The load is from IMR data and I have had it tested by Tom Armbrust @4100 - 4250 PSI in a 2 3/4" chamber. I'm very comfortable with this. I just measured a random sample of these hulls and not one was over 2 11/16" in length. I would suggest that manufacturing tolerances in case thickness, internal base height, variation in powder and primer lots might cause more pressure variation than 1/16" to 1/8" inch in case length. Forcing cone configuration would be another factor. I don't believe you can really tell what you have in the way of pressures unless you test in the individual gun in which the loads are to be fired. I also believe that if you err on the side of conservatatism, it doesn't really matter.

LCSMITH