H414 and W760 are as pointed out the same, nowadays. I am not sure if 760 morphed into H414 or the other way round.
However, older batches of 760 may not be exactly the same as the latest 760/H414 brews.
And yes, they/it has a reputation for being temp sensitive. I have never experienced any issues though and I run one load using 760 that is reasonably well up there. I also don't leave my ammo lying around frying in the sun either.
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