@ 04:03 am (GMT)
john mitchellI'm curious as to why in some calibers the first And sometimes the second shot are faster than subsequent rounds. It makes sense and is true normally that first cold bore rounds are slower. Anyone have a clue to this conundrum
@ 08:44 pm (GMT)
Re: cold bore shotshi john
im having two guess's here at this one.
first you might still have some lubricant in your barrel reducing drag that doesnt burn off until a few shots.
2nd guess is that with clean barrel you have no carbon in barrel after this builds you are reducing the size of bore creating more drag on bullet slowing it down.
@ 09:13 pm (GMT)
Re: cold bore shotsBang on.
Sometimes a bore will get faster if it fouls and tightens in tolerance, raising pressures and velocity
Other times, I note that drag can slow a bullet a down or as Thomas says- lube burns away and drag is increased.
It can go either way.
@ 02:03 am (GMT)
Re: cold bore shotsThanks Thomas and Nathan . I'm thinking the bore tightening might be what's going on . the barrels I'm shooting over the crony are prepped the same. But I'm just guessing. Thought it was interesting though and I've noted it before.