Re: lee collet dies/rcbs dies/foster bonanza dies/who\'s dies are best?
Here's my method for fine tuning dies. It works great for me and some others have responded that it worked great for them;
My $.02 worth---ALL dies with expander balls need tuning. Think about it...a piece of typing paper is .003" thick--what are the odds that the expander is not PERFECTLY centered in a die and could pull a case slightly off center??? Pretty good I'd say. Pull the expander stem out of the die (and now is a good time to clean the inside of the die). Run about 5 brass into the die and see if they come out concentric. If they do (and usually they will) you now have to try and get that stem centered on re-assembly. A great way that helps is to put a piece of very concentric brass up into the die to hold the stem in place as you tighten it down. Sometimes this takes 2 people unless you have 3 or 4 hands. AFter reassembly try sizing some brass and check runnout. If not good then do very small turns of the expander stem--probably 1/32 of a turn at a time. Resize some brass and repeat the small turns. At some point I can almost guarantee that you will get GREAT RUNNOUT CONSISTANTLY. (Somehow, someway the expander spindle will hit almost perfect centering in the die body) I have many dies that consistantly make less than .002" runnout after sizing with most of the brass at .001" and less. I own, hornady, redding, forester, rcbs, and lee dies. ALL OF THEM HAVE BEEN TUNED and most make fantastic ammo and all make good ammo!! I have never ever got a set of dies from any factory that made as good of ammo as those that I have done this simple work with.
One last thought. I think a low angle inside mouth deburrer is a NECESSARY tool on the reloding bench. Lyman makes a cheap one that comes in a wood handle. Screw off the wood handle and throw it away and chuck the tool in a drill. I've found "not" carefull chamferering can cause bullet runnout on seating. The bullet should go in with perfect tension. With my old rcbs deburrer I always kind of felt a "pop" as it started and sometimes could shave the bullet slightly. This lyman tool is about $12 and is worth every penny!