600 yard reloading---arbor press or threaded?

[drano38]

I’m building a 6 Dasher for 600 yard BR, and need to decide what type of seating dies to use—Forster threaded or Wilson on an arbor press.
I want accurate loads but don’t want to spend extra money on more tools if it doesn’t help.
I’ve got a Redding Big Boss, and plan to resize on this w/ a Hornady custom made bushing die.
I could also seat bullets on it w/ a Forster 6 Dasher Ultra Seater die.
If I went the arbor press/Wilson die route, the K&M press w/ the seating force measuring option seems like a very good choice.
A third option is the Harrell’s 4 hole turret press, using the threaded dies. I know of one 600 IBS shooter who does well with his. Since I already have the Redding, if I go w/ the Forster seating die, I’d determine runout produced on it before considering purchasing the Harrell’s press.
I’m sure there are lots of people on both sides of the fence on types of dies, but I’d like your inputs, especially from shooters who use both threaded and arbor dies who can provide their results on both because they have used both.
Thanks in advance

 

[fdshuster]

drano38: I have and use both the Wilson arbor press,, for the 6ppc and 222), with the micrometer head chamber dies, and several Forster Ultra micrometer benchrest seating dies,, for the 6BRs', 223s' and a 22BR), using the RCBS "Rockchucker" press. Can't find any difference in the quality,lack of run-out) of the loaded rounds. Both seating methods produce excellent results, although I find the Wilson arbor press to be a bit slower. If I had to choose only one seater type, it would be the very high-quality Forster.

 

[Forum Boss]

I echo what Gunamonth says. First, I measure every loaded round base to ogive with a Stoney Point tool--just as a double check. The Wilson shows less length variance measured off the ogive.

Concentricity--I don't think I have a good enough tool to really judge this, but at 600 yards, I think the Wilson seated rounds agg slightly less.

"Feel"--Nothing comes close to the Wilson used with K&M Arbor with force gauge. The gauge immediately alerts me if something is really wrong--could be a bad neck,work-hardened), or the odd bullet that is slightly large in diameter. I had one box of Hornady V-Maxes that were NOT all the same diameter!

I will say this about Redding vs. Forster full-length dies--I've had great luck with both. And if you want a custom honed neck, the Forster is much cheaper. Forster will hone the neck for $10 plus shipping. This is a very nice solution once you've figured out what neck tension your cartridge/bullet combo likes.