Raimey,
In your story of how you acquired the drilling and 6.5x70R ammo, I took note of the seller's statement that he had trouble with the cases cracking and he couldn't get a handle on annealing them. Is the ammo "factory" or is it handloaded? If handloaded, was it loaded using factory cases or cases formed from another caliber case? I suggest you don't shoot any of the ammo until you work it out. Original ammo would be pretty old and cases could be brittle from age. If the ammo is loaded in cases redrawn from some other cases they may be work hardened and brittle from the process (on the other hand, you would think someone that could redraw cases would anneal them, but maybe not far enough down. Did he send the split cases?). It might be to save the remaining cases, you need to break the ammo down and anneal the cases before they split. If you have split cases, can you post photos of the splits and the headstamps?
Mike
