What's the difference between these two types of dies?

[OldSchoolRanger]

I was browsing the Brownell's web site, and I noticed that in addition to standard RCBS 223 F/L die sets.  They also carry: RCBS AR SERIES DIE SET 223 REM , and the RCBS X-Die Small Base Die Set 223 Rem

I know the X-Die set is a small base die set, but what is the AR series die set?  Are these also small bases dies, if so, what is the difference, and why the difference in price?

[HL]

X-dies are not small base sizing dies, they are more of a neck sizer. I would imagine the AR dies are a small base die set to insure cycling.

[OldSchoolRanger]

X-dies are not small base sizing dies, they are more of a neck sizer. I would imagine the AR dies are a small base die set to insure cycling.

That's what I thought, until I saw the description.  RCBS X-Die Small Base Die Set 223 Rem
 It specifically states: Small Base Die Set.

[HL]

Maybe its a special X Die. the X-die I have for my 7mag is not SB. I had to buy that separately. Maybe I'm just not well informed.

[geezerbiker]

A quick call to RCBS will give you the correct answer.

Tony

[Lloyd Smale]

my guess is it comes with a crimp die.

[OldSchoolRanger]

I took geezerbikers advice and gave a call to RCBS. 

I was told that both die sets are small base dies, but the AR series die set has a taper crimp seater.  The X-Die series has a regular seater die, but RCBS claims that you don't have to trim the brass because it has a special sizer die.