Has anybody used RX7 with their 44 mag loads. I haven't tried it yet but I poured some in a case, just below the level of a seated bullet, and it measured out to be 20 grains. I have some 265 and 300 grain gas checks that I can use. Normally, I use 20 grains of H110 behind a 300gr lead bullet and since RX7 is slower than H110 should 20 grains of RX 7 be safe. Also, what primers would you use, pistol or rifle? Do you have any suggestions, and is this safe?

Thanks,

Jim C

:) FYI,
I went to the range and tried the 20 gr RX7 behind a 265 gr GC
. Not knowing what to expect I was a little apprehensive. Anyway, the load chronographed at 750fps, a real pussycat load. Very accurate, verry pleasant to shoot, but I noticed a few grains of unburned powder in the cases. I used large pistol primers, next time I think I'll use large rifle primers. Just have some RX7 sitting around and I wanted to get rid of it.


Regards,

Jim C

Might try a magnum large pistol primer the next time. That will give you a little hotter ignition. The large rifle primer will have about the same intensity as the present standard large pistol primer, but will have to have a harder firing pin hit to ignite. Might get some misfires using the rifle primer in a handgun. If you're shooting out of a rifle, then should be no problem.

i have tried IMR-4198 in 44 mag RIFLE loads, up to 28 grs. 4198 has a burn rate close to rl-7.

i have tried IMR-4198 in 44 mag RIFLE loads, up to 28 grs. 4198 has a burn rate close to rl-7.

Think you guys are safe...seriously doubt you could get enough Rx7 or 4189 under a bullet seted to standard OAL to cause you any real pressure concerns (assume you don't compress the powder into dust).

Kind of wasteful of powder (and powder costs are prtty much the same between burning rates), but as it's bought and paid for and you've no other use for it, may as well use it for something.

Was a time long ago when 4831 was dirt cheap and got used for all sorts of rifle rounds that were much too small-volumed for that powder...but it was cheap enough to be cost effective and it flung a bullet out the barrel with good accuracy. I burned up a bunch of it by filling 30-30 cases (without a measure...just kind of dip filling them) and using up a bunch of 150gr. FMJ military pulls.

JimC -

BTDT, but got somewhat different data... [data taken with a Marlin 1894s, 20" barrel, 1:38 etc]

240gr swcl, 1.610" 25gr rl7 wlp 82degF produced 1235fps, 3"+ group 10shots/50yrds (compressed load, lots of unburned powder left in action and chamber).

300gr tcl 1.610" 22gr rl7 wlp 56degF produced 998fps, 1.9" group (slightly compressed load, some unburned powder left in action/chamber).

We tried switching to wlpm's for some of the other fast rifle powder data, but didn't see any real difference in the amount of unburned powder left behind. W/re RL7 in 44mag: our conclusion runs generally along the lines of - slower than 1680, 4198 or vvn120 in the 44 can be done, but generally isn't worth the effort/cost.

do shoot straight,
greg
www.gmdr.com

For those who are interested-
I loadeded 22 grs Reloader7 with Large Rifle Primers for my Dan Wesson 44 mag. That's up from my original post of 20 grs and large pistol primers. The 20 grs shot 750 fps, the 22 grs shot 920 fps, and the large rifles primers didn't burn any cleaner than the large pistol primers. That's about all the RX7 I can get in a 44mag case without compressing the powder. It's a fun load to shoot, minimal recoil and accurate. I'm shooting 265 gr FNGC.

I wonder how 322 would work?

Good shootin'

JimC

about the same, i reckon. i used a nef single shot. c.o.l. was around 1.8", 28 gr imr 4198, no crimp, 240 xtp, fed pistol primers. little unburned powder. @ 3" grouups at 100 yds.