Intel6
09-15-2010, 02:25 PM
I have been working on making 200 gr. .40 JSP's for loading in 10mm. I did some initial load testing and finally was able to get a second batch done.
I have been testing with IMR 800X powder and for those that don't know 800X is a great powder (the best?) for loading high velocity loads in the 10mm. The big problem is that 800X is a cut flake and it is terrible trying to make it be consistent through most powder measures. Imagine trying to run corn flakes through a giant powder measure and you will understand why the weight variances with 800X almost make it not work using.
I recently got a RCBS Chargemaster auto powder measure that dispenses charges by weight so now I am able to load 800X in my 10mm loads and know that the charges are correct. I loaded up a test batch of loads using my 200 gr. JSP using BT dies and was just going to collect some chrono data on them out of both my 10mm revolver and my Glock 20 in 10mm. I realized the no one has really done much accuracy testing of these bullets and I decided that I would clamp the two test guns in my Ransom machine rest and see how they shoot while at the same time collecting my data.
I had tried using my Glock 10mm in the rest years ago and didn’t have much luck with it. The plastic frame doesn’t seem to work well in the rubber Ransom inserts and at the time I was getting some vertical stringing that I attributed to the gun moving in the inserts. I decided that since I was planning on shooting the bullets in my S&W 610 revolver in the rest I might as well try it again. I figured even if there is some vertical stringing it would still give some idea of the accuracy. In this case I chose to use a stock G20 with the factory barrel instead of my G20 with the BarSto barrel. I probably would get a little better accuracy with the BarSto but I figured using the factory barrel would be more useful. At the same time I was testing my heavy 225 WFNGC cast bullets in 10mm and I specifically wanted to see how they performed in the factory Glock barrel. I discovered in this case that for whatever reason this testing with the Glock went well and there didn’t seem to be any obvious vertical stringing?
I have to bring up one thing about this test because some might think I tried to skew the results by shooting at a specific distance. Due to having to dodge the daily monsoons here in SE AZ at this time of the year I only tested from the Ransom Rest at 25 Feet. I typically test at further distance but I needed to do this quickly so all my equipment didn’t get soaked and it wouldn’t take all day. Collecting chronograph data is easy and running loads on the Ransom Rest is complicated as there is lots of running back and forth to the target and keeping track of the process to ensure you don’t get things mixed up. When you combine both of these processes together is can get real difficult but the results are satisfying. So because of this I chose the shorter distance because if I didn’t compromise on something I would have never got this test completed.
So on to the results. In the pics you will see a few things. My chronograph downloads the data to a excel spreadsheet so I take that and manipulate it so I can keep it. I modified the data so I could cut it out and tape it directly onto the target to identify each group with the specific info. In the case of these pics the info is mostly the same except for the load data and the velocity. I am not sure how well this will turn out here on the forum but at least you can see the groups and what they measured. I measured the groups center to center so I measured the overall group and subtracted 0.40” to get the measurement written in blue next to the group.
The first two pics (left to right) are the groups I shot with the S&W 610 revolver. There are 6 groups to look at. The 1st group was shot with a 165 gr. JHP made by Montana Gold. It is my limited competition load and I used it to make sure I was getting good positioning of the target on the backer. Groups 2-6 were shot with BTS 200 gr. JSP’s all around 1,000 fps. Again these were initial testing loads, I have a lot more room to push these bullets a lot faster. One thing to notice is I had some primers separate from the bullet and impact the target. In this case you can see the primer hit circled in red between groups 3 and 4.
The next two pics (pics 3&$ Left to right) are the same 5 loads used in the revolver (groups 2-6) but these were shot out of a stock Glock 20. I also had some primers separate from the bullets and you can see them below group #1 and between groups 2 & 3.
I have been testing with IMR 800X powder and for those that don't know 800X is a great powder (the best?) for loading high velocity loads in the 10mm. The big problem is that 800X is a cut flake and it is terrible trying to make it be consistent through most powder measures. Imagine trying to run corn flakes through a giant powder measure and you will understand why the weight variances with 800X almost make it not work using.
I recently got a RCBS Chargemaster auto powder measure that dispenses charges by weight so now I am able to load 800X in my 10mm loads and know that the charges are correct. I loaded up a test batch of loads using my 200 gr. JSP using BT dies and was just going to collect some chrono data on them out of both my 10mm revolver and my Glock 20 in 10mm. I realized the no one has really done much accuracy testing of these bullets and I decided that I would clamp the two test guns in my Ransom machine rest and see how they shoot while at the same time collecting my data.
I had tried using my Glock 10mm in the rest years ago and didn’t have much luck with it. The plastic frame doesn’t seem to work well in the rubber Ransom inserts and at the time I was getting some vertical stringing that I attributed to the gun moving in the inserts. I decided that since I was planning on shooting the bullets in my S&W 610 revolver in the rest I might as well try it again. I figured even if there is some vertical stringing it would still give some idea of the accuracy. In this case I chose to use a stock G20 with the factory barrel instead of my G20 with the BarSto barrel. I probably would get a little better accuracy with the BarSto but I figured using the factory barrel would be more useful. At the same time I was testing my heavy 225 WFNGC cast bullets in 10mm and I specifically wanted to see how they performed in the factory Glock barrel. I discovered in this case that for whatever reason this testing with the Glock went well and there didn’t seem to be any obvious vertical stringing?
I have to bring up one thing about this test because some might think I tried to skew the results by shooting at a specific distance. Due to having to dodge the daily monsoons here in SE AZ at this time of the year I only tested from the Ransom Rest at 25 Feet. I typically test at further distance but I needed to do this quickly so all my equipment didn’t get soaked and it wouldn’t take all day. Collecting chronograph data is easy and running loads on the Ransom Rest is complicated as there is lots of running back and forth to the target and keeping track of the process to ensure you don’t get things mixed up. When you combine both of these processes together is can get real difficult but the results are satisfying. So because of this I chose the shorter distance because if I didn’t compromise on something I would have never got this test completed.
So on to the results. In the pics you will see a few things. My chronograph downloads the data to a excel spreadsheet so I take that and manipulate it so I can keep it. I modified the data so I could cut it out and tape it directly onto the target to identify each group with the specific info. In the case of these pics the info is mostly the same except for the load data and the velocity. I am not sure how well this will turn out here on the forum but at least you can see the groups and what they measured. I measured the groups center to center so I measured the overall group and subtracted 0.40” to get the measurement written in blue next to the group.
The first two pics (left to right) are the groups I shot with the S&W 610 revolver. There are 6 groups to look at. The 1st group was shot with a 165 gr. JHP made by Montana Gold. It is my limited competition load and I used it to make sure I was getting good positioning of the target on the backer. Groups 2-6 were shot with BTS 200 gr. JSP’s all around 1,000 fps. Again these were initial testing loads, I have a lot more room to push these bullets a lot faster. One thing to notice is I had some primers separate from the bullet and impact the target. In this case you can see the primer hit circled in red between groups 3 and 4.
The next two pics (pics 3&$ Left to right) are the same 5 loads used in the revolver (groups 2-6) but these were shot out of a stock Glock 20. I also had some primers separate from the bullets and you can see them below group #1 and between groups 2 & 3.