March 7, 2010.

posted Feb 25, 2011, 6:11 AM by Peter Lucas

Tests using Beretta O/U with jug chokes.  Following tests were shot using 2.5 drams (68 grains) of Goex FFFG.  The shot charge was supposed to be 1 ounce of nines. However, the pellet count would indicate that 1 1/4 ounce of nines were being shot.  Subsequent weighing of the charge confirms that the shot charge was slightly in excess of 1.25 ounces One over the powder wad and one over the shot wad.  No cushion wad was used:

 Number of pellets at 20 yards percent pellets at 40 yards
 10 inch20 inch30 inchtotal 10 inch20 inch30 inchtotal
load 1186325175686 7.118.223.148.4
load 2227343174744 9.121.823.754.6
load 3245312171728 10.522.924.557.9
load 4216332186734 7.821.623.452.8
load 5185325172682 6.418.826.551.7
load 6228277193698 8.822.220.151.1
load 7208239150597 9.119.217.345.6
load 8277291119687 13.723.922.059.6
load 9237291177705 10.122.221.453.7
load 10206301193700 7.118.223.148.4
load 17193281169643 8.018.221.848.0
load 18181245169595 6.018.617.041.6
 216297171683 8.620.522.051.1

The 51.1 percent pattern density is equivalent to a skeet choke.  The probability of a hit at 20 yards was a follows:

Probability of hit
 0-10" 0-20" 0-30" sum norm
Edge-on 100.00%99.40%91.40%95.00%99.10%
+/- 0.00%0.30%2.10%1.20%0.20%
Full-on 100.00%100.00%99.90%100.00%100.00%
+/- 0.00%0.00%0.10%0.10%0.00%

While this patterning was more than satisfactory, this load does probably not produce adequate velocities.  The estimated velocity for a 2.5 dram/1.25 ounce load is only 840 feet per second.
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