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I've shot a bunch of the 150s using a load that's considered too hot in modern manuals. In those old manuals, it was 1/2 a grain of Unique more than a similar 158 load for about the same performance. I'd suggest using your favorite load for a 158 lead bullet as a starter and work from there.

fwiw, better long-range performance will come from the heavier bullet. I no longer shoot anything lighter than 158 in lead swcs, and I much prefer the Keith bullet which various sources cast as 168 to 173 grains.
 
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