Quote:
Originally Posted by DaleJ
....Retumbo would be the choice powder for this build, because of its low heat index. Retumbo did cause some extreme pressure problems, starting loads were a bit light causing detonation but pressures smartened up as I increased charge. 58 gr of Retumbo caused .008" extractor groove expansion and soot ring around primer. At 59.5 gr high pressure indicators were gone. Found a sweet spot at 62.5 gr, accuracy was impressive, Oehler chronograph showed 3150 fps with 135 gr bullets.
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Dale your
wildcat load development process is interesting.
You kept increasing the charge after a low charge detonation (ok, I get that bit). Then increased it again after .008" case head expansion and the primer soot ring....till the pressure indicators went away and accuracy increased.
I don't imagine this approach is applicable to developing
book loads?