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Old 04-27-2009, 07:25   #34
Bringsteen
10mm Shooter
 
Join Date: Dec 2007
Posts: 101
Hodgdon Lil'Gun Works in the 10mm!

I have already posted this, but I wanted to put it in the Hodgdon Powder data sticky so that people would know where to look.

THESE DATA ARE NOT FROM A RELOADING GUIDE. YOU ASSUME ALL RESPONSIBILITY CONCERNING YOUR USE OF THESE DATA.

After much theorizing, I decided to load Hodgdon Lil’Gun in the 10mm. My starting loads were based on a number of factors:
--maximum working pressure for the 10mm (which, at 37,500, is lower in practice than some people realize);
--Hodgdon’s various Lil’Gun loads for the .327 Federal, .38 Super, and .357 Magnum;
--total grain capacities of the 10mm and the above calibers; and,
--my experience with the 10mm’s slowest recommended powder, Accurate #9.

These factors do not add up to an ability to perfectly predict the outcome. But I am happy to note that not only was I able to complete the testing safely, but I came up with some rather promising results.

Components:
--Hornady 180 grain XTP bullets;
--New Starline brass;
--CCI 350 Magnum Pistol Primers.

Everything I read about Lil’Gun indicated that it requires a magnum primer and a heavy crimp. In preparing these loads, I seated and lightly crimped the bullets with a conventional seating/crimping die, then immediately put a heavy-duty crimp on them with a Lee Crimp die. I did the initial crimp before the heavy-duty crimp because some of the charges were slightly compressed. Incidentally, while Hodgdon has warned in the past that Lil’Gun should not be compressed, in the 2009 Hodgdon reloading manual Hodgdon published a compressed Lil’Gun load for the .38 Super. I loaded all cartridges to just under 1.260".

As a baseline, I fired two strings of high-power Accurate #9 loads on the same day as the Lil'Gun loads. All strings were fired in the same pistol, my Colt Delta Elite Gold Cup. I used a 24 pound Wolf recoil spring, coupled with the original recoil spring plug, which incorporates a smaller, secondary spring. My Delta Elite does not have a fully-supported chamber.


Accurate #9, 15 grains
_ 1)_1331.0_ -32.6 f
_ 2)_1366.0_ 2.4
_ 3)_1370.0_ 6.4
_ 4)_1373.0_ 9.4
_ 5)_1365.0_ 1.4
_ 6)_1354.0_ -9.6
_ 7)_1360.0_ -3.6
_ 8)_1368.0_ 4.4
_ 9)_1370.0_ 6.4
_ 10)_1379.0_ 15.4

__ High:_1379.0
__ Low:_1331.0
__ E.S.:_ 48.0
__ Ave.:_1363.6
__ S.D.:_ 13.3
__ 95%:_ ±10.0


Accurate #9, 15.5 grains
_ 1)_1393.0_ -7.9
_ 2)_1417.0_ 16.1
_ 3)_1398.0_ -2.9
_ 4)_1395.0_ -5.9
_ 5)_1405.0_ 4.1
_ 6)_1410.0_ 9.1
_ 7)_1399.0_ -1.9
_ 8)_1413.0_ 12.1
_ 9)_1396.0_ -4.9
_ 10)_1383.0_ -17.9

__ High:_1417.0
__ Low:_1383.0
__ E.S.:_ 34.0
__ Ave.:_1400.9
__ S.D.:_ 10.3
__ 95%:_ ±7.8

Hodgdon Lil’Gun, 15 grains
_ 1)_1219.0_ -19.8
_ 2)_1217.0_ -21.8
_ 3)_1260.0_ 21.2
_ 4)_1256.0_ 17.2
_ 5)_1265.0_ 26.2
_ 6)_1247.0_ 8.2
_ 7)_1242.0_ 3.2
_ 8)_1224.0_ -14.8
_ 9)_1233.0_ -5.8
_ 10)_1225.0_ -13.8

__ High:_1265.0
__ Low:_1217.0
__ E.S.:_ 48.0
__ Ave.:_1238.8
__ S.D.:_ 17.7
__ 95%:_ ±13.4

Hodgdon Lil’Gun, 15.5 grains
_ 1)_1250.0_ -5.3
_ 2)_1254.0_ -1.3
_ 3)_1267.0_ 11.7
_ 4)_1227.0_ -28.3
_ 5)_1286.0_ 30.7
_ 6)_1272.0_ 16.7
_ 7)_1266.0_ 10.7
_ 8)_1216.0_ -39.3
_ 9)_1238.0_ -17.3
_ 10)_1277.0_ 21.7

__ High:_1286.0
__ Low:_1216.0
__ E.S.:_ 70.0
__ Ave.:_1255.3
__ S.D.:_ 22.7
__ 95%:_ ±17.1

Hodgdon Lil’Gun, 16 grains
_ 1)_1282.0_ -4.5
_ 2)_1314.0_ 27.5
_ 3)_1282.0_ -4.5
_ 4)_1285.0_ -1.5
_ 5)_1304.0_ 17.5
_ 6)_1298.0_ 11.5
_ 7)_1253.0_ -33.5
_ 8)_1268.0_ -18.5
_ 9)_1279.0_ -7.5
_ 10)_1300.0_ 13.5

__ High:_1314.0
__ Low:_1253.0
__ E.S.:_ 61.0
__ Ave.:_1286.5
__ S.D.:_ 18.1
__ 95%:_ ±13.7

Hodgdon Lil’Gun, 16.5 grains
_ 1)_1246.0_ -47.7
_ 2)_1323.0_ 29.3
_ 3)_1286.0_ -7.7
_ 4)_1310.0_ 16.3
_ 5)_1320.0_ 26.3
_ 6)_1297.0_ 3.3
_ 7)_1286.0_ -7.7
_ 8)_1282.0_ -11.7
_ 9)_1273.0_ -20.7
_ 10)_1314.0_ 20.3

__ High:_1323.0
__ Low:_1246.0
__ E.S.:_ 77.0
__ Ave.:_1293.7
__ S.D.:_ 24.0
__ 95%:_ ±18.1


These results are quite promising. The fired brass and primers looked very healthy. As noted earlier, I fired these in a pistol without a fully-supported chamber. While I often see “Glocksmiles” (even though it is a Colt) when shooting high-power 800-X loads, there were none to be found from the Lil’Gun loads. An average of 1293 is nothing to write home about, particularly considering the 1400 fps average in the 15.5 grain Accurate #9 load. But the fact is that Lil’Gun works in the 10mm! I don’t have time right now, but I am interested in moving up .5 grain to 1 grain.

I hope that this information is valuable.
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