nitesite
February 3, 2007, 11:14 PM
I previously started a thread about my attempt to find a reload recipie for a friend which would closely duplicate the velocity and felt recoil of his chosen carry round, which is Cor-Bon's excellent 10mm DPX 155-grain ammunition utilizing the Barnes all-copper bullet. I posted my report in Reloading.
My friend and I both carry Glock 29s frequently. However, I prefer to follow the heavier/slower crowd when it comes to bullet selection. My chosen bullet has been the 180-grain Gold Dot and I normally use Georgia Arms new Shear Power Plus ammunition as my carry load.
As I mentioned in that previous thread, I chronographed his CorBon DPX 155-gr ammunition thru my Glock 29 prior to beginning load work-up. Amazingly, CorBon loads the 155-gr DPX bullet in both the .40S&W and the 10mm at the same published velocity (1200-fps). I measured their 10mm ammunition at an average 1138-fps thru the G29s 3.78" barrel. The consistency of this factory ammo was impressive at 17.21-fps ES and only 9.53-fps SD. The people at CorBon are to be commended for their quality standards.
This afternoon I had a little time, so I did a chronograph test of my heavier/slower Georgia Arms carry load, which states on the package a claimed 1150-fps. Now if CorBon says their 155-gr does 1200 feet-per-second and Georgia Arms says their 180-gr does 1150 (both from actual firearms and not test barrels) I fully expected to see my bigger/slower ammo of preference would chrono a bit under 1100 feet-per-second.
Boy Howdy was I ever surprised! Both loads were fired from the same gun. Both the G29 and ammunition were at room temperature, same elevation at 669' above sea level.
CorBon 155-gr DPX AV 1138.62 ES 17.23 SD 9.53
Georgia Arms 180 GD AV 1185.57 ES 16.96 SD 6.78
http://i4.photobucket.com/albums/y141/nitesite9/CorBon-155-DPX-stats.jpg
http://i4.photobucket.com/albums/y141/nitesite9/Georgia-Arms-Chrono-Test.jpg
By the way, here's what a recovered 180-gr Gold Dot loaded by Georgia Arms looks like after being shot thru my G29 into gallon jugs of water. Remember that water is harder on bullet integrity than gelatin.
http://i4.photobucket.com/albums/y141/nitesite9/10mm-gold-dot-180.jpg
You may ask "What about accuracy?" Well, occasionally I can do accuracy testing (from a rest) just a few hundred yards from my house. If there hasn't been any recent rain I have access to a high dirt bank for a good backstop.
http://i4.photobucket.com/albums/y141/nitesite9/chrographtestsinthepit2.jpg
But when water is standing 50'-75' from the bank I can only do chronograph testing. And I am not sure what kind of accuracy, and from what distance, should be expected from a compact pistol.
Conclusions:
The CorBon 155-grain Barnes Bullet DPX 10mm load is a very consistent and light recoiling round with 100% weight retention and great expansion. CorBon obviously has tight control over their manufacturing process.
The Georgia Arms 180-grain Gold Dot 10mm load is a bit heavier on recoil but is very controllable which also has near 100% weight retention and also has expansion and round-to-round consistency that is truly impressive.
Best regards,
nitesite
My friend and I both carry Glock 29s frequently. However, I prefer to follow the heavier/slower crowd when it comes to bullet selection. My chosen bullet has been the 180-grain Gold Dot and I normally use Georgia Arms new Shear Power Plus ammunition as my carry load.
As I mentioned in that previous thread, I chronographed his CorBon DPX 155-gr ammunition thru my Glock 29 prior to beginning load work-up. Amazingly, CorBon loads the 155-gr DPX bullet in both the .40S&W and the 10mm at the same published velocity (1200-fps). I measured their 10mm ammunition at an average 1138-fps thru the G29s 3.78" barrel. The consistency of this factory ammo was impressive at 17.21-fps ES and only 9.53-fps SD. The people at CorBon are to be commended for their quality standards.
This afternoon I had a little time, so I did a chronograph test of my heavier/slower Georgia Arms carry load, which states on the package a claimed 1150-fps. Now if CorBon says their 155-gr does 1200 feet-per-second and Georgia Arms says their 180-gr does 1150 (both from actual firearms and not test barrels) I fully expected to see my bigger/slower ammo of preference would chrono a bit under 1100 feet-per-second.
Boy Howdy was I ever surprised! Both loads were fired from the same gun. Both the G29 and ammunition were at room temperature, same elevation at 669' above sea level.
CorBon 155-gr DPX AV 1138.62 ES 17.23 SD 9.53
Georgia Arms 180 GD AV 1185.57 ES 16.96 SD 6.78
http://i4.photobucket.com/albums/y141/nitesite9/CorBon-155-DPX-stats.jpg
http://i4.photobucket.com/albums/y141/nitesite9/Georgia-Arms-Chrono-Test.jpg
By the way, here's what a recovered 180-gr Gold Dot loaded by Georgia Arms looks like after being shot thru my G29 into gallon jugs of water. Remember that water is harder on bullet integrity than gelatin.
http://i4.photobucket.com/albums/y141/nitesite9/10mm-gold-dot-180.jpg
You may ask "What about accuracy?" Well, occasionally I can do accuracy testing (from a rest) just a few hundred yards from my house. If there hasn't been any recent rain I have access to a high dirt bank for a good backstop.
http://i4.photobucket.com/albums/y141/nitesite9/chrographtestsinthepit2.jpg
But when water is standing 50'-75' from the bank I can only do chronograph testing. And I am not sure what kind of accuracy, and from what distance, should be expected from a compact pistol.
Conclusions:
The CorBon 155-grain Barnes Bullet DPX 10mm load is a very consistent and light recoiling round with 100% weight retention and great expansion. CorBon obviously has tight control over their manufacturing process.
The Georgia Arms 180-grain Gold Dot 10mm load is a bit heavier on recoil but is very controllable which also has near 100% weight retention and also has expansion and round-to-round consistency that is truly impressive.
Best regards,
nitesite
