Thread: Redding S Type Match Dies - Bushing or not?

Originally Posted by Gerardo

Yes I believe so, although your new loaded neck diameter will more than likely need a new bushing size?

No, not this - not the bit about needing a different size of bushing. As James has said, if you are using the same neck-turned brass, then all that will be happening in the new chamber is that the necks will be expanding to a larger diameter on firing. If it is the same brass, and so the neck thickness remains unchanged, then the same bushing will give the same neck tension as before.

What may be affected is the ability of that same bushing to size the (future) larger neck diameter of the the fired cases back down in one neck sizing step with the same degree of concentricity as was being achieved before, as from this point onwards the bushing will have more work to do on the cases fired in the new chamber. It may well be fine, but that is something you may want to check with a concentricity gauge on either the sized necks, or perhaps on the bullets in the finished loaded rounds, if such things are important to you.

As far as fitting or not fitting a bushing - yes - the bushing has to be fitted. Once you've fired the brass in the new chamber it will become quite apparent why it is required. Again as James has written above, on the existing cases you have from out of the previous chamber, a very tight neck can leave fired cases with a degree of residual neck tension from spring-back in the brass.