The point of this thread (if I may be so bold) is to determine if you can tailor loads for a carbine by using a slower burning powder. In order to determine this, it isn't enough just to post data from a carbine. We must measure the amount of increased velocity obtained from the longer barrel VS. a shorter barrel. We all know that we will get higher velocity from a carbine. But will using a slow burning powder give us more than using a fast burning powder ?
Ok, let me provide the data I collected today:
Two loads were tested.
124 grain FMJ bullet over 8.2 grains of Blue Dot
147 grain FMJ bullet over 6.2 grains of Blue Dot
These two loads are both max loads according to the Alliant website.
Out of the 3.1" barreled KelTec P11 I got an average velocity of 1113 fps with the 124 grain load and an extreme spread of 17 fps. I got an average velocity of 940 fps with the 147 grain bullet and an exteme spread of 23 fps .
Out of the 6.25" barreled Glock 34 I got an average velocity of of 1334 fps with the 124 grain load and an exteme spread of 56 fps. I got an average of 1066 fps with the 147 grain load and an exteme spread of 73 fps.
Out of the HiPoint carbine I got an average velocity of 1445 fps with the 124 grain load and an extreme spread of 130 fps. Using the 147 grain load out of the carbine, I got an average velocity of 1077 fps and an exteme spread of 165 fps.
Ok, so that gives us an average increase in velocity of 332 fps when going from the little KelTec to the HiPoint carbine using the 124 grain bullet. When going from the 6.25" barreled Glock 34 to the carbine we get an increase of 111 fps using the 124 grain load. When going from the 3.1" barreled KelTac to the 6.25" barreled Glock, we get an increase of 221 fps.
Using the 147 grain load, we get a boost of 137 fps when going from the KelTec to the carbine. We get ONLY 11 FPS when going from the Glock to the carbine. And finally we get 126 fps when going from the KelTec to the Glock. A much bigger increae with the shorter barrels than with the longer barrel.
It looks like the 124 grain bullet loads get a much bigger boost with the longer barrel than the 147s.
Also FWIW, these two loads out of the LRM M169 integrally suppressed 9mm AR15 upper:
124 grain load = 1194 fps, exteme spread= 47 fps
147 grain load = 976 fps, exteme spread = 37 fps
Note that dispite the M169's gas bleed off system, the 124 grain load remains supersonic. Also note that the Glock 34 gives you higher velocity with all loads tested over the LRM M169 upper. This upper give you only slightly better balistics than the 3.1" KelTec.
Just as the Alliant website said, the 147 grain max load using Power Pistol is faster than the max load using Blue Dot out of all three guns.
Ok, let me provide the data I collected today:
Two loads were tested.
124 grain FMJ bullet over 8.2 grains of Blue Dot
147 grain FMJ bullet over 6.2 grains of Blue Dot
These two loads are both max loads according to the Alliant website.
Out of the 3.1" barreled KelTec P11 I got an average velocity of 1113 fps with the 124 grain load and an extreme spread of 17 fps. I got an average velocity of 940 fps with the 147 grain bullet and an exteme spread of 23 fps .
Out of the 6.25" barreled Glock 34 I got an average velocity of of 1334 fps with the 124 grain load and an exteme spread of 56 fps. I got an average of 1066 fps with the 147 grain load and an exteme spread of 73 fps.
Out of the HiPoint carbine I got an average velocity of 1445 fps with the 124 grain load and an extreme spread of 130 fps. Using the 147 grain load out of the carbine, I got an average velocity of 1077 fps and an exteme spread of 165 fps.
Ok, so that gives us an average increase in velocity of 332 fps when going from the little KelTec to the HiPoint carbine using the 124 grain bullet. When going from the 6.25" barreled Glock 34 to the carbine we get an increase of 111 fps using the 124 grain load. When going from the 3.1" barreled KelTac to the 6.25" barreled Glock, we get an increase of 221 fps.
Using the 147 grain load, we get a boost of 137 fps when going from the KelTec to the carbine. We get ONLY 11 FPS when going from the Glock to the carbine. And finally we get 126 fps when going from the KelTec to the Glock. A much bigger increae with the shorter barrels than with the longer barrel.
It looks like the 124 grain bullet loads get a much bigger boost with the longer barrel than the 147s.
Also FWIW, these two loads out of the LRM M169 integrally suppressed 9mm AR15 upper:
124 grain load = 1194 fps, exteme spread= 47 fps
147 grain load = 976 fps, exteme spread = 37 fps
Note that dispite the M169's gas bleed off system, the 124 grain load remains supersonic. Also note that the Glock 34 gives you higher velocity with all loads tested over the LRM M169 upper. This upper give you only slightly better balistics than the 3.1" KelTec.
Just as the Alliant website said, the 147 grain max load using Power Pistol is faster than the max load using Blue Dot out of all three guns.
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