Ever do something that makes you question what you are seeing? I have been working on a load for the Python and wanted to up the velocity on my coated 158swc to see if I could improve the accuracy. I used AA#7 for powder. I had loaded up a test batch last week and wasn't happy with where they were at. This morning I went over all of my data again and decided to go up on charge weight. I am using a Lee auto disk powder measure, I went from the 7.1cc hole to the 7.6cc, 10.8gr to 11.6gr.
I had my Shooting Crony set up around 12 feet and the target at 15 yards. I run 10 through the WC Ruger and 10 through the Colt not really paying attention to what I was writing down. It wasn't until back at my desk looking at the numbers I realized that this was an exceptional load. I crunched the numbers and was looking at single digit extreme spreads and standard deviation. Thinking I may have errored, I loaded another 20 and went back out. Running a second set shrank the numbers for the Ruger. I had one round that blew the single digits for the Colt. No signs of pressure and brass was falling out before I could hit the ejector. Oh, did I say these are accurate. Just one ragged hole from both guns.
Yes, I have loaded out what brass I have for .357 before it broke anything down. waiting and watching for Starline to make a batch.
Numbers below;
Ruger WC GP100 3"
20 rounds
AV 1195
H1198
L1189
ES 9
SD2.75
Colt Python New Model 4.25"
20 rounds *lowest removed
AV1282 *1287
H1291
L1274 *1284
ES 17 *7
SD 6 *3