Do you guys have a conclusion on why your the underbored/overbored barrels didn't do as well as the correctly bored barrel? According to the video underbore/overbore should be more accurate, right? Does it have to do with the quality of porting?
And I was actually talking to guys on A5OG about whether or not the Hammerhead is rifled all the way through/same diameter. So it's not? Or does the rifling/consistent diameter just end near the end of the barrel? And why should it matter if the front of the barrel is .700?
Do you think that the Hammerhead suffers in accuracy behind the CP 14" because you can't get the same quality of finish on a barrel with lands and grooves as you can on a barrel that's just polished?
"didn't do as well" - I'll parse that a bit if you don't mind. There are four performance criteria that matter on barrels. Efficiency, consistency, barrel breaks and accuracy. here's how things stack up:
overbore = good consistency, poor efficiency
paint to barrel match = poor consistency, moderate efficiency
underbore = good consistency, good efficiency
all barrels are the same on accuracy and barrel breaks
as to the hammerhead desing - we tested the MoFo and the band stikxx. they use a short barrel sizer - about 2" long. that's smooth if I remember correctly. then it steps up to the rifled front of the barrel. the reason the bore of that matters is that being a large bore barrel the paint doesn't make much (if any) real contact with the rifling - so imparting spin would be unliklely.
And just to be clear, the hammerhead wasn't worse tan the CP. it wasn't better either. they shot quite similar accuracy-wise.