Loading details:
175 Grain Winchester Silvertip JHP
CCI 300 primers
Starline brass (fresh first firing)
Loaded to 1.259 to 1.263 inch cartridge overall length
on a Dillon 550B (hence the COL variation, sorry haven't gotten this problem worked out)
Lee dies, Lee factory crimp.
10 rounds each load.
Pistol details:
Colt Delta Elite Stock barrel. No idea how many rounds have gone though the barrel but it looks good to fair condition.
Chronograph:
Shooting Chrony Gamma
Weather:
70 degrees F
3000 Feet above sea level
30.28 inHg pressure
Now the results:
8.6 grains Longshot
Minimum velocity: 1180.28
Maximum velocity: 1226.19
Average Velocity: 1199.32
Extreme Spread: 45.91
Standard Deviation: 15.81
8.8 grains Longshot
Minimum velocity: 1188.62
Maximum velocity: 1234.82
Average Velocity: 1212.61
Extreme Spread: 46.20
Standard Deviation: 12.56
9.0 grains Longshot
Minimum velocity: 1192.25
Maximum velocity: 1242.68
Average Velocity: 1218.65
Extreme Spread: 50.43
Standard Deviation: 14.66
9.2 grains Longshot
Minimum velocity: 1206.15
Maximum velocity: 1263.17
Average Velocity: 1237.30
Extreme Spread: 57.02
Standard Deviation: 21/61
9.4 grains Longshot
Minimum velocity: 1246.13
Maximum velocity: 1290.64
Average Velocity: 1265.61
Extreme Spread: 44.51
Standard Deviation: 13.52
Different day.
Weather:
60 degrees F
3000 Feet above sea level
29.92 inHg pressure
9.6 grains Longshot
Minimum velocity: 1268.6
Maximum velocity: 1315.7
Average Velocity: 1295.8
Extreme Spread: 47.1
Standard Deviation: 14.3
9.8 grains Longshot
Minimum velocity: 1295.9
Maximum velocity: 1332.0
Average Velocity: 1316.1
Extreme Spread: 36.1
Standard Deviation: 11.6
The 9.6grain load is my camping load. It flattens primers but no smiley's in the Colt's throated barrel. Once I get though the 9.6 loads I will work up a new load, hopefully without the flattened primers, with the new Lot of Longshot I've got now.
Hope this adds to the discussion.
I cut and pasted this info from a post I made a while back on Ammosmith.com
http://www.ammosmith.com/forum/index.php/topic,4317.0.html
175 Grain Winchester Silvertip JHP
CCI 300 primers
Starline brass (fresh first firing)
Loaded to 1.259 to 1.263 inch cartridge overall length
on a Dillon 550B (hence the COL variation, sorry haven't gotten this problem worked out)
Lee dies, Lee factory crimp.
10 rounds each load.
Pistol details:
Colt Delta Elite Stock barrel. No idea how many rounds have gone though the barrel but it looks good to fair condition.
Chronograph:
Shooting Chrony Gamma
Weather:
70 degrees F
3000 Feet above sea level
30.28 inHg pressure
Now the results:
8.6 grains Longshot
Minimum velocity: 1180.28
Maximum velocity: 1226.19
Average Velocity: 1199.32
Extreme Spread: 45.91
Standard Deviation: 15.81
8.8 grains Longshot
Minimum velocity: 1188.62
Maximum velocity: 1234.82
Average Velocity: 1212.61
Extreme Spread: 46.20
Standard Deviation: 12.56
9.0 grains Longshot
Minimum velocity: 1192.25
Maximum velocity: 1242.68
Average Velocity: 1218.65
Extreme Spread: 50.43
Standard Deviation: 14.66
9.2 grains Longshot
Minimum velocity: 1206.15
Maximum velocity: 1263.17
Average Velocity: 1237.30
Extreme Spread: 57.02
Standard Deviation: 21/61
9.4 grains Longshot
Minimum velocity: 1246.13
Maximum velocity: 1290.64
Average Velocity: 1265.61
Extreme Spread: 44.51
Standard Deviation: 13.52
Different day.
Weather:
60 degrees F
3000 Feet above sea level
29.92 inHg pressure
9.6 grains Longshot
Minimum velocity: 1268.6
Maximum velocity: 1315.7
Average Velocity: 1295.8
Extreme Spread: 47.1
Standard Deviation: 14.3
9.8 grains Longshot
Minimum velocity: 1295.9
Maximum velocity: 1332.0
Average Velocity: 1316.1
Extreme Spread: 36.1
Standard Deviation: 11.6
The 9.6grain load is my camping load. It flattens primers but no smiley's in the Colt's throated barrel. Once I get though the 9.6 loads I will work up a new load, hopefully without the flattened primers, with the new Lot of Longshot I've got now.
Hope this adds to the discussion.
I cut and pasted this info from a post I made a while back on Ammosmith.com
http://www.ammosmith.com/forum/index.php/topic,4317.0.html