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3/20/2017 5:03:23 PM
Posted: 9/24/2012 1:45:10 PM EDT
what is the difference 223/5.56 sb and fl
i know one is small base and full length

which is better and why?


Link Posted: 9/24/2012 2:40:58 PM EDT
From RCBS.

The Small Base Sizer Die sizes the case from the shoulder to the head of the case a couple of thousandths smaller than a Full Length Sizer Die. In certain calibers it also sets the shoulder of the case back a thousandth or two more than the Full Length Sizer Die.


I load for several semi-autos and I have yet to find the need for a SB die. YMMV
Link Posted: 9/24/2012 3:03:10 PM EDT
so fl is good enough for ar15 5.56/223
Link Posted: 9/24/2012 3:36:28 PM EDT
[Last Edit: 9/24/2012 3:37:16 PM EDT by BIGGDAWG]
Originally Posted By wallacefan:
so fl is good enough for ar15 5.56/223


it is for me all i use is fl dies the less i work my brass the better i think.

the only time you would want sb dies is if you have a tight chamber and are having problems with fail to chamber or fte

just my opinion
Link Posted: 9/24/2012 3:40:57 PM EDT
Originally Posted By wallacefan:
so fl is good enough for ar15 5.56/223



IMO, yes, as long as you set it up properly. Case gauge the FL sizing and the shoulder bump and you should be fine. Especially it you have a 5.56 chamber.
Link Posted: 9/24/2012 4:10:33 PM EDT
so no benefit of sb die?
Link Posted: 9/24/2012 4:37:06 PM EDT
Originally Posted By wallacefan:
so no benefit of sb die?


Actually they are less desirable by many as they over-size and weaken the brass prematurely. Benefit, No, not in any of my semi-autos, just the opposite.

Link Posted: 9/25/2012 6:09:12 AM EDT
[Last Edit: 9/25/2012 6:09:43 AM EDT by Motor1]
I agree with the others. It's only a benefit if you need it. This gets debated pretty often but If your gun "runs" fine on fl sized brass why use sb? It's just over kill IMO.
Link Posted: 9/25/2012 10:51:25 AM EDT
I think the only time you would need a s.b. die is if you were using brass that has been fired in machine guns.The chambers of machine guns tend to be on the large size.
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