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Greetings 7RMBoy,
As the powder does not seem to be in the original containers (IMR powders were in steel containers until about 2000, roughly) you need to be sure from your dad that it is actually...

Greetings Ariki,
Some of the older ADI cans had a use by date but I have not seen one on IMR powders. Dupont only started marketing IMR4831 about 1972 although the 4831 marketed by Hodgdon in the...

Greetings 7RMBoy,
I have a couple of suggestions for loads to get you started. I have recently tried to have a working load for my rifles, that I can use while faffing around with different powders...

Greetings 7RMBoy,
I don't have a 7mm Rem Mag (do have a 7mm SAUM) but think that you will find 4831, especially the IMR version, too fast especially for the heavier projectiles. AR2217 (H1000) or...