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cast lead Vs semi- or full jacketed rounds consistency ?
mister callan
Mid-Atlantic
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Forum Posts: 521
Member Since:
February 21, 2011
February 21, 2011
Offline1
September 20, 2025 - 9:58 pm
I was messing about working up a load (early stages) for a bunch of bullets I "inherited".
Al were for .357 or .38 bores & cases were all .38 Spl.
Some were cast (& lubed) lead, others were either FMJ or semi-jacketed FPs.
When I ran the chrono numbers I discovered all the cast lubed loads had substantially wider velocity variations (E.S.) & so higher SD's than all the the FMJ or semi Jacketed rounds!
Apart from types of bullets all my loading steps were identical.
Is this normal or am I missing something.
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