No such thing as a good seating die

[heritage5]

Yeh I am sure Saun Campbell R d Davis and Eric Cortina use this method Hallo

[PeteFox]

Good one Guy,
if a seater stem is off-centre after doing this, get the welder out to fill the hole in and just start over.

[ned kelly]

G'day All,
you could just go +10 thou jam with light neck tension. Helps align everything better than dies if the barrel has been fitted properly. Seems to work for me on multiple cartridges, bullet types and barrels in BR, F class and hunting rifles provided you have a solid set up for rest and bags of course.
Then all I need to worry about is reading the mirage and wind, which is were all the effort is needed... but I'm an old fashioned type of guy.
Hope this helps
Cheerio Geoff

[Frank Green]

If you’re willing to sacrifice a few bullets you can use some diamond grit paste and a drill and “lap” the stem to fit the bullet better with a drill

This in most cases is probably your best option as long as your seating stem/die can handle the modification. I know some of bullet makers that do this for they're own bullets as well.

If you have Hornady bullets... they make a dedicated bullet seating stem for they're given bullets. I've got them for my ATIP's and a few others....

https://store.hornady.com/a-tip-match-seating-stems-2

Another option that works....or at least helps.... and I do this if I use my old RCBS match dies with the loading window but you can do it on regular dies as well....

Partially seat the bullet, lower the ram and rotate the round a little and seat again. I'll rotate the round at least once or twice before fully seating the bullet. This helps with loaded bullet/ammo run out.

Also watch your sizing operation. If your sizing and depriming all in one operation...your decapping rod could be kinking/inducing runout into your case necks and when you seat the bullets.... it amplifies the bullet runout.

Later, Frank
Bartlein Barrels

[wsftr]

I always nudge mine in (as per Franks post), takes longer but means that variances (and there are a lot of small things that play into this) get handled on an individual basis. Getting two angled surfaces using pressure to arrive at exactly the same point each time from one bullet to another inside a case that has a variable amount of friction and when each bullet and case is not exactly the same - yeah right...