RCBS® AR Series Die Sets -
RCBS® AR Series dies are perfect for the progressive
reloader. These die sets consist of both a Small Base Sizing
Die and a new Taper Crimp Seating Die. By including both of
these dies in one set, it makes it easier for AR-style and
Semi-auto shooters to reload. The Taper Crimp Seater die is
more forgiving for the variety of case lengths involved when
reloading for these high volume guns. Buckled shoulders and
Case Neck crimp bulges basically eliminated when the Taper
Crimp is used with bullets that have cannelure.
AR Series Die Set Features:
- Designed for AR-style and semi-auto rifles
- Distinctive black RCBS® die box
- Small Base sizing
- Taper Crimp bullet seating
- RCBS® Limited Lifetime Warranty
We asked the
RCBS® Product Marketing Manager, Kent Sakamoto, some of the
common questions we are getting about the AR Series dies. He
was glad to answer. See our Q&A below:
1. So Kent, what makes the AR Series Die Different than
lets say a Group A .223 Remington Full Length Die Set?
AR Series dies feature a Small Base Sizing die
and TAPER crimp seating die. Previously RCBS only offered
Taper Crimp seating die in our Special Order catalog. This
is the first time Taper Crimp seating has been offered in a
standard die set.
2. What is a Small Base Sizing Die or maybe a better
question would be why would I need it?
A Small Base sizing die is a little tighter in
the web area than a Full Length Sizer. Semi Auto, pump and
lever action rifles tend to have tighter chambers than bolt
action rifles, thus requiring the tighter small base sizer.
3. Doesn't a full length die set take care of the same
The difference is only a few thousandths between
a Full Length sizer and Small Base, but that can be the
difference between chambering and not chambering. Most times
a Full Length sizer would have done the job if the sizing
die was set properly in the press to cam over. For some
reason, handloaders back the sizing die up after contacting
the shell holder, when they should be going a ¼ turn further
4. Why is a taper crimp essential for AR Style rifles?
For many AR handloaders, volume is the goal and case
prep/trimming is not always done. Crimp must be applied to
ammunition being used in semi-auto weapons. Taper Crimp is a
little more forgiving when various length brass is being
used. Less ammunition comes out with buckled shoulders or
5. What about over working brass or lessening the life of
Small Base sizing will work the brass more in the thick
area of the case and possibly reduce case life. Fortunately
.223/5.56 brass is plentiful and relatively inexpensive. If
the rifle has a good chamber, typically case necks will
split before case head separation occurs.
6. What about once fired brass - especially from other
Once fired brass is typically fine to use. Just because
they came out of an AR is irrelevant. Cases should be
checked for case head separation as a well worn chamber will
ruin brass even on the first firing.