Same with IMR4740 here, the nice diethyl ether smell changed to something less pleasant and the interior of the tins rusted out. I had a few tins too, originally from Din no doubt but I think mine came via Neville Orr in UH who also used to handload a bit of ammo for me in the early 90s.
Was the 4740 from pulled 30.06? I thought it might have been? Worked fine for me in the .257 Roberts.
Unwanted powder can be lots of fun for the young 'uns by having their names written in big (cursive) powder letters across the garden, and putting a match to one end, and is even better after dark. Admittedly not so good for the lawn this way though.
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