Being polite Bob, simply being polite.
It doesn't cost anything and the wish that it all turns out well is sincere.
If I was being nasty, I think you'd know it. You have seen me do nasty before. Brian is simply a nice guy who is caught in a quandry he can't resolve. He's asked for his check back, which is OK too.
And before Grumble or you jump on my head for "butting in" to his group buy -- I was asked in writing by Brian to try to resolve a .003" tolerance this bullet that would be acceptable (at my own risk, of course). I tried, but he judged it unsuccessful after 3 days of trying.
Now Bob, if YOU were going to put a .003" tolerance band on those lubricised driver bands, where would you start and stop?
Trouble only exists if the real "as-cast" size goes below .312" for a standard fat 30 bore gun. .312" to .315"? Add +.0005" for Doug's pot of wonder metal that he uses for fitting? This bumps it to .3125" to .3155" as an "as-cast" print range, which is still sizeable down to .309".
Tell Doug to aim his process at .3145" as his process center and trust his lower distribution tail doesn't go out of print since it has a full .002" to go to get there? (then at least you CAN return the ones that do go out of the bottom of the print range back to Doug, he'd have to take them)
What would you do?
What surprised me is that so many of his group members are planning to do this bullet at .309" sized diameter. That's actually another separate group buy with a tolerance range of .3105" to .3135" centered at .3130" for process center.
It is difficult to try to resolve this wide difference in wants and needs. You have to give up some at the top and accept some risk at the bottom if you even try to split the difference between these two disparate uses.
So, other than throwing a rock or two at me when circumstances permit, what would you do to help Brian out by making him up a .003" tolerance?
That check bearing envelope won't get picked up until tomorrow morning and the night is still young, you know. You can still be a hero -- what would you do?
Kelly