Freebore to bearing surface clearance

[boiler_house7]

Have a question on freebore to bullet bearing surface clearance. Fixen to chamber up a 6.5 gap and I cut my 1" off the tenon and chucked up the stub and dialed in the stub close with a deltronic pin. reamed out the stub to check freebore which i know going to have to increase for the 140's. I reamed the throat out with the unithroater and got to checking various brands of bullets for COL and for bullet shoulder junction placement on case. What i noticed was the A-max bullet was the only bullet i checked that did not have marks on the side of bearing surface and fell right into the chamber stub with no resistance to touch the lands for COL. I know there is very small difference in bullet OD but shouldn't there be a little clearance .0002 or so between bearing surface and freebore until the bullet touches the lands. Playing around with the stub i did lightly hit the freebore area with a fine cratex round insert and all bullets went in with no marks after steel woolen the bullets. Just curious on thought. Bill

 

[Dusty Stevens]

Maybe after the barrel is broken in you wouldnt have that problem

 

[boiler_house7]

Thanks dusty, your prolly right, didn't see per say any reamer marks in throat area. Just didn't know if some check this and if there really is a correct solution if there are on the tight side other than bullet selection ot lots, or if it even matters. Thanks Bill

 

[fguffey]

The 6.5 has a bore of .256” and a groove diameter of .264” with a 3° basic taper. And then of course there are all the variations. The only way the bullet can hit the beginning of the forcing cone without hitting the rifling first would be to seat the bullet with the flat with end out or shoot flat nose bullets.

I have no reservation about driving the bullet into the lands when imprinting the bullet to or into the lands. I drill the flash hole/primer pockets out to a diameter that will accommodate a cleaning rod. I use a case whit all the bullet hold I can get by sizing the neck then I seat the test round into the chamber and us ea dowel of a cleaning rod to push the bullet out of the case and into the lands. All of my bullets imprint on the rifling.

After pushing the bullet out of the case and into the rifling I remove the test case to adjust my seating die.

F. Guffye