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I know first hand that BLC-2 and H335 are near identical powders in performance and just {maybe} your father knew that too.
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They might be close on "performance" but they're no where near each other on burn rate charts or load data. Hodgdon lists 335 at #81 and BLC2 at #102 and charge weights for identical bullets in cartridges that use both powders are substantially lower for 335 than for BLC2. Between 2.5 and 3.0 grains different in .270Win and 5.0gr difference on 140gr in 7mm-08.