20 Practical build

[GrocMax]

A question for you 20 Practical guys. I bought a Redding type S bushing die and started reducing the necks on some new Lake City brass. The bushing doesn't size all the way down to the neck shoulder junction. I don't have the barrel yet to check, but how is the brass going to chamber if there is a "step" on the neck?

When you neck down the 223 to 20, the junction of the neck to shoulder should move UP slightly. When doing 20's don't screw the cap down all the way on the bushing, let it float 1/2 a thread or so, you'll see the difference. If not, no worries UNLESS you crush the case and mushroom the shoulder, then you'll get tight chambering. If so run it thru a FL die to fix the shoulder.

 

[AlNyhus]

Rick's concern is how to eliminate the 'lump' at the bottom of the neck when necking the cases down. -Al

 

[Rick300]

Rick's concern is how to eliminate the 'lump' at the bottom of the neck when necking the cases down. -Al

Exactly

 

[GrocMax]

Which is what I was referring to- if you don't adjust from 223 bushing height it leaves a 'lump' at the top of the neck, which is ugly but gets ironed out first firing, BUT can lead to a quicker incidence of donuts at the base of the neck. 20P is subject to donuts being a problem after a few firings on a zero freebore chamber and the 39-40's.