Is there any science to this other than 'looks about the same size'?
I attended a talk given by Chris King, he said that metal PF30 bob shells could be tapped for T47, just as long as there was enough metal there.
He makes T47 bb's, conceivable that he knows what he's talking about.
@Dammit started
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Is there any science to this other than 'looks about the same size'?