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Old Ranger
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Posted: 19 November 2017 at 9:08am | IP Logged Quote Old Ranger

Reloader 7. AKA; Rx7, R7, RE7, and RL7. Well I
used Rx7 for decades in a multitude of
calibers with excellent results. Then
Hercules "died" and Alliant rose from the
ashes as the new guy making Rx7. Imported
from Sweden, it was hotter than the Rx7 of
old. I sorta fell away from using the new
stuff....

Being prone to extended research in any
endeavor I undertake, I found in my
studies of 55gr bullets in the
.223Rem/5.56mm loading some listings with
Rx7. Then it hit me. When I had my old
AR180 I loaded tons of 223 with 55gr FMJ
and Rx7. Duh! Why reinvent the wheel?
Sierra had the data on the Swedish powder
and. I found an old friend.

Starting at 19.5gr and stopping at 21.5gr
I ran the gamut with Rx7 and the 55gr in
my little carbine. The 21.5gr load with
the Hornady 55gr SPBT proved to be a
powerful and accurate load. 2900 fps is
fine for me. I know you can hit 3100 and
even 3200 fps with some of the AA powders
but I've never been too fond of them
except for 5744. So I'll hang with good
ole Rx7 for my little popper. 2900 fps
with this 55gr bullet stabilizes well in
the 1:8 bore. The sub-MOA group is just a
byproduct.

Edited by Old Ranger on 19 November 2017 at 11:37am


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Buffalogun
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Posted: 19 November 2017 at 12:51pm | IP Logged Quote Buffalogun

Wade,

My Sierra manual #3 instructs to reduce max loads by 1 grain if you are using military brass! Loads in my manual were worked up in a Colts AR15.



Mike

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hoghunter
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Posted: 19 November 2017 at 5:15pm | IP Logged Quote hoghunter

I kind of feel the same way about IMR / H 4895. I now use
in all my 223's with excellent results.

Also works well in my 308's with 125 and 150 grain bullets.

I have some 243's that shoot it very well with 85 grain and
under bullet. However the IMR 4350 definitely works better
for me with the heaiver bullets in the 243.

I could probably survive with two powders for everything:
4895 for rifle and 231 for pistol.
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Old Ranger
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Posted: 20 November 2017 at 5:40am | IP Logged Quote Old Ranger

My "works in about everything" powder has always been
IMR3031. And some years ago Rx7 was a secondary powder.
Neither are known as heavy load powder, but then again I
don't do heavy loads either. I had just forgotten how
well Rx7 functioned in the 223. Glad I found this pound
in my powder magazine.

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hoghunter
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Posted: 20 November 2017 at 6:35pm | IP Logged Quote hoghunter

I'm with you Old Ranger on not doing heavy loads; don't
need them.

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Old Ranger
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Posted: 22 November 2017 at 5:06am | IP Logged Quote Old Ranger

Yes sir, aside from being predominantly more accurate,
modesty loaded rounds are more economical, safer, cases
last longer, and more pleasant to shoot. What's not to
like?

Finding the Rx7 in my powder magazine was a real blessing
for my AR15 carbine. I found my notebook from the 80s on
loading for my fine old AR180. It's filled with loads
with this, Win 748, and H335. Nothing outlandish or hot
but just substantially moderate loading with any of these
powders. As with anything related to reloading, a change
in components warrants working up from starting loads to
the desired levels. With this new mixture of Rx7, I've
gone easy as I'm well aware it's not the old Rx7 with the
occasional red kernels mixed in like when Hercules made
it. The newer stuff is a might hotter. If anything, I'm a
cautious citizen.

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