Thursday, August 14, 2014

Range day

Blew off laundry and such today and headed to the range, partly for practice, partly for fun, and partly to get the numbers I was going to get the last time, but couldn't because- surprise!- the battery in the Chrony was dead.

Primary this time was fire the same load in a 4" barrel .357 Mag revolver and in the 16"-barrel Model 92 clone.  Did this with two loads: first 125-grain X-Treme plated flatpoints over a charge of 2400 powder.  That worked out as follows for four in the rifle(chrony trouble) and five from the revolver:

            Rifle                Revolver
            1457                1109
            1407                1047
            1466                1044
            1474                1094

Average of 1451fps for the rifle, 1067fps for the pistol, so the extra 12" of barrel is giving almost 400fps higher velocity(384 to be exact).

Then moved to some Hornady FTX 140-grain bullets over AA#9 powder, and the Chrony worked as it should this time

            Rifle                Revolver
            1498                1192
            1510                1185
            1501                1130
            1514                1115
            1507                1141

Average of 1506 for the rifle, 1152 for the pistol, difference of 354fps.

The Hornady information shows this load giving 1550fps from a 16" barrel, so just a little below that.  It also shows this giving 1250fps from a 4" barrel revolver, again I got below that.  I really want to get a bunch of water jugs together and fire these into it, see how the bullet expands.

The other thing wanted to note, remember that I helped a guy put a load together for his AR15 in 7.62x39?  Would up settling on 22.0 grains H4198 over the X-Treme 123-grain plated bullet; functioned the action fully and reliably, the only problem being that occasionally that flat-nose bullet would catch on the front of the magazine instead of sliding over.  A pain, but not a big deal for a practice load.  Well, we were finally able to run some of those loads over the Chrony, too.  This time we got eight readings before the wind started gusting and causing problems:
Average velocity 1839.  That's a little higher than I expected, and higher than X-Treme recommends for those bullets.  He's had no problems with copper buildup or other nasties in the bore, and he says it consistently gives groups like this:

That's seven rounds at 100 yards, far better than I expected for a light practice load.  Considering these run $42.25 plus shipping for 500, let's say he's happy.

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