Thread: Neck concentricity using wilson neck bushings

Level 10 nerd question: if you switch your wilson bushing to the tight side, does it improve or worsen concentricity?

Im expecting crickets here because i know thats an enormous red herring. But if ya dont ask...

I’d say it Shouldn’t make any difference on concentricity if your using it in a “Wilson die” ? There are a lot of other things that affect it.

No change in concentricity

Im just using it in a redding type s. Its only got 1thou runout normally. Just hoping to keep it at least there. Im not sure zero is worth obsessing over

As long as your brass was neck turned beforehand it should still be concentric

I always rotate my brass half way when starting to seat projectiles..eg start them seating,then spin them by hand and finish seating..... fellas much cleaverer than me have poohooed it,then tried it and ate humble pie....you have nothing to loose trying it.

Originally Posted by Micky Duck

I always rotate my brass half way when starting to seat projectiles..eg start them seating,then spin them by hand and finish seating..... fellas much cleaverer than me have poohooed it,then tried it and ate humble pie....you have nothing to loose trying it.

Thought this was standard practice, it’s what I have done for years.

Originally Posted by Doon

Thought this was standard practice, it’s what I have done for years.

apparently its not....and Im yet to find it on set of written load instructions....

One thing I have found that will induce run out when neck sizing brass is the amount the brass has to be reduced in size. For example I load for one 6.5x55mm rifle that the fired cases measure .299" but the RWS brass needs to be reduced to .290" to give me my desired .002" neck tension.

Redding suggest that any reduction greater than .005" needs to be done in steps and when I tried this the large amount of run out I was seeing by doing it in one step reduced drastically.

Even though it's nice to have run out of .0005" or less I doubt there would be any off the shelf hunting rifle that would show any advantage in accuracy with run out up to .002".