Thread: AR2209 Lot Variations in the 6.5 x 55.

Interesting thread and well suited to a campfire and beers. I have oft puzzled over poi changes between okd and new loads. I've decided that such things as slight changes in neck tension due to ageing brass or different brass lots or numbrr of times reloaded, primet batches. and seating depth are all potential factors. I have for instance measured up yo 5 thou" chsnge in seating depth simply between v cold winter temps and hot summer temps affecting expansion of the press itself. I have also measured differences in bullet dimensions like length, base to ogive, ogive to point, cannelure position between batches of same brand. Even weight variances within and outside lots. Nowdays I try to mitigate these variances by various simple means , often "dead reckoning" and then accept that a couple of medium range foulers to check zero before a serious hunting trip are a good idea. Of course, at a range comp you have two sighters anyway, and there are good basic reasons for that allowance.