Right(RB & Fiver)....
I bead roll sheet metal,which besides producing pretty durn cool profiles,definitely gets you thinking about process engineering. So changing shapes of lube and drive bands isn't that big of a stretch on the ole noggin. Faster,would be willing to bet,and certainly cheaper than changing a mould.
As for measuring.... got to take a little look back at the OP; "one" aspect of that nose die is it's OD roundness and how that,compared to say a sq chunk of steel,assists itself in use. Translated; you stick a bullet in it say,best you can WRT straightness. The "check" is to roll it.
I have a coincentricity gage that doesn't get pulled out much anymore because the processes have somewhat circumvented it. AND a small flat inclined plane that I roll cases,empty and loaded down. Because of time spent with the fancy gage,have gotten to where it's fairly apparent,at a glance on the flat plate whether or not there's need for further inspection.
The OP die,with a bullet "started" but not sized can be rolled down the plate. You're in serious visual trouble if you can't see whether its started straight or not. The more you use it,the less you need it. I have rolled nekkid bullets and seen issues. Dosen't happen all the time but,gets one to thinking about these things.
I bead roll sheet metal,which besides producing pretty durn cool profiles,definitely gets you thinking about process engineering. So changing shapes of lube and drive bands isn't that big of a stretch on the ole noggin. Faster,would be willing to bet,and certainly cheaper than changing a mould.
As for measuring.... got to take a little look back at the OP; "one" aspect of that nose die is it's OD roundness and how that,compared to say a sq chunk of steel,assists itself in use. Translated; you stick a bullet in it say,best you can WRT straightness. The "check" is to roll it.
I have a coincentricity gage that doesn't get pulled out much anymore because the processes have somewhat circumvented it. AND a small flat inclined plane that I roll cases,empty and loaded down. Because of time spent with the fancy gage,have gotten to where it's fairly apparent,at a glance on the flat plate whether or not there's need for further inspection.
The OP die,with a bullet "started" but not sized can be rolled down the plate. You're in serious visual trouble if you can't see whether its started straight or not. The more you use it,the less you need it. I have rolled nekkid bullets and seen issues. Dosen't happen all the time but,gets one to thinking about these things.