Redding Full length sizing type "S" bushing die

[Turbulent Turtle]

I shoot an Armalite AR-10 for mid and long range, so I prefer to FL size even though I single load them, in fact FL sizing for the Armalite I have noticed that shooting FL sized cases in my bolt gun have tightened up those groups as well.

You sound surprised and you should not be. Proper full length sizing will produce more consistent ammunition and give you better results than just neck sizing.

 

[300 RUM]

brass with bullet seated is .3365, so would it be safe to get .334 bushing

.002" under the diameter of the smallest neck of all the loaded round is ok. Brass will spring back, outward. If loading for an auto, you might get a smaller bushing, .003" You will end up with about 3 bushing.

OK I see how that will get me back to what I have now for size. Lets say I get a bushing that is the actual size of the loaded round, that give a reduced physical neck tension, but how do I know what is good and what is not? Is that a trial and error process or is there something else?

Get a .334" bushing to start, so you can use the die. Redding will tell you on there website to use a bushing .001" smaller than the loaded rounds neck. This gives very light neck tension, even when outside neck turning. I find .002" under to be better, even with my neck turned brass. Remember, the brass springs OUT after sizing with a bushing & no expander button. When the seating of a bullet expands the neck by .002" , neck tension/bullet pull is about 40lbs (223 rem) Yes, a little trial and error. Different Brass = Different Bushing.

Ok had a chance to use the new die today. After a few tries to adjust the die to head space at 1.6195 I tried the .334 and .335 bushing, each bushing gave me the correct difference in sizing according to it's decimal value. WONDERFUL! It's amazing how you can fell the difference between the too when seating a bullet.

I like that it gives you the option to use or not to use the expander ball, I won't need it 80% of the time, but will have to use the other % of time due to the fact I'm shooting an Armalite. I like the felt tension of the .334 bushing, it seem right at least for now. I loaded up ten each to see if there is a difference in grouping.

Oh and you can defiantly feel the difference between the Forster die when the neck is being size in comparison to the Redding bushing, the Redding is very smooth comparably.

 

[243winxb]

The size markings/stamp on the bushing faces down towards the neck when installed correctly Some are raised and should not come in contact with the top of the die. Can make the bushing crooked on sizing.