I've been using 748 since 1975 or so and it's my go to powder for the 223 with bullets from 52 grains to 75 grains. It is also useful in the 308 and other mid bore cartridges. It meters very well and seems to be consistent from lot to lot.

Hodgdon used to market a powder called H335 and it was very close to 748 in performance. I burned a lot of it as in the 70s it was significantly cheaper than 748 was.

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Keep your powder dry.