Looks like they're somewhere between a 6 and a B gauge. Or up to 4, if you're European.
http://en.wikipedia.org/wiki/Gauge_(bore_diameter)#Conversio...
I think you mean gouge.
Looks like they're somewhere between a 6 and a B gauge. Or up to 4, if you're European.
http://en.wikipedia.org/wiki/Gauge_(bore_diameter)#Conversio...