vaalpens
Member
- Joined
- Aug 14, 2014
- Messages
- 2,618
This week I received 25 beautiful Sierra V-Crown 125gr 9mm bullets from AoG. Thanks again AoG!
This is the same bullets that are loaded in the Sig brand of bullets. Since I load 357sig, I immediately decided that these bullets have to be loaded for 357sig, obviously if they will work.
I contacted Sierra and they graciously sent me some load data for both 9mm and 357sig for the Sierra 125gr JHP, even though these bullets are not exactly the same. They did indicate that I could use the same load data as the Sierra #8125 .355" 125 grain JHP bullet. Obviousluy I thanked them for the information and asked if they were planning on including BE-86 and CFE Pistol in their load data, and that I was planning on using BE-86 since I have some baseline data. They could not say if and when they will do it, but the ballistic technician took the time to look up the BE-86 data and suggested a range to me.
The first thing I had to decide on was a COL to load. Based on my experience with previous bullets, the length of the bullet and my ogive test, I decided on a COL of 1.125" instead of the standard 1.135".
Next I had to make sure the bullet will work in 357sig. This was done through my normal ogive, plunk, setback and bathroom scale tests. The bullet passed all the tests and confirmed I will be able to use it.
Following is an image of the dummy bullet I created which was used in the above tests.
I then had to decide on a target velocity I want to shoot for. There is not much velocity data for these bullets, but I did find a test on YouTube where a Glock with a 4" barrel was used. I tallied all the shots and saw an average of 1282fps. This velocity is just a bit higher than the average I get for my JHP's using BE-86 of 1258fps.
Based on the above information and my previous tests I have done, I decided to go with a BE-86 starting load of 7.6gr with increments of .1gr giving me 4 loads of 7.6gr, 7.7gr, 7.8gr and 7.9gr.
Following is an image of the completed 4 loads I will be testing.
These bullets will be tested with a chrono, and at 10 yards for accuracy. After the test I will pick a load close to 1282fps, assuming it performed ok accuracy wise, and then load the last 5 bullets with the load data. Hopefully I can then test these last 5 rounds against some medium to get and idea of the expansion.
This is the first of a few posts, and I will follow up with all test results for these bullets in 357sig.
This is the same bullets that are loaded in the Sig brand of bullets. Since I load 357sig, I immediately decided that these bullets have to be loaded for 357sig, obviously if they will work.
I contacted Sierra and they graciously sent me some load data for both 9mm and 357sig for the Sierra 125gr JHP, even though these bullets are not exactly the same. They did indicate that I could use the same load data as the Sierra #8125 .355" 125 grain JHP bullet. Obviousluy I thanked them for the information and asked if they were planning on including BE-86 and CFE Pistol in their load data, and that I was planning on using BE-86 since I have some baseline data. They could not say if and when they will do it, but the ballistic technician took the time to look up the BE-86 data and suggested a range to me.
The first thing I had to decide on was a COL to load. Based on my experience with previous bullets, the length of the bullet and my ogive test, I decided on a COL of 1.125" instead of the standard 1.135".
Next I had to make sure the bullet will work in 357sig. This was done through my normal ogive, plunk, setback and bathroom scale tests. The bullet passed all the tests and confirmed I will be able to use it.
Following is an image of the dummy bullet I created which was used in the above tests.
I then had to decide on a target velocity I want to shoot for. There is not much velocity data for these bullets, but I did find a test on YouTube where a Glock with a 4" barrel was used. I tallied all the shots and saw an average of 1282fps. This velocity is just a bit higher than the average I get for my JHP's using BE-86 of 1258fps.
Based on the above information and my previous tests I have done, I decided to go with a BE-86 starting load of 7.6gr with increments of .1gr giving me 4 loads of 7.6gr, 7.7gr, 7.8gr and 7.9gr.
Following is an image of the completed 4 loads I will be testing.
These bullets will be tested with a chrono, and at 10 yards for accuracy. After the test I will pick a load close to 1282fps, assuming it performed ok accuracy wise, and then load the last 5 bullets with the load data. Hopefully I can then test these last 5 rounds against some medium to get and idea of the expansion.
This is the first of a few posts, and I will follow up with all test results for these bullets in 357sig.
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