12/29/2023 0 Comments Sig 9mm carbine rifle![]() Same with the 124 gr ammo, much of the factory stated velocity numbers are all real close to the 1125 fps number (most of it between 1090 - 1110 fps, but some in the 1150 fps range too). Considering that the speed of sound is around 1125 fps, and considering the numerous variations that could affect those numbers, it’s not hard to see how ammo could come out of the muzzle on an MPX just above the speed of sound, but dip below the transonic barrier before it gets to 25 yards, or after 25 yards but before 50 yards. When you look at a lot of the stated ammo velocities for say the 115’s, you have PMC at 1150 fps, Magtech at 1135 fps, Blazer brass at 1150 fps, etc. ![]() ![]() as in not worth the trouble and expense). While I have the capability to chronograph all the different types of ammo and at the distances shot, I was not going to do that (i.e. an ammo that shot great at 9 yards, if it broke the barrier on the way to 25 yards would have a 2" - 3" groups at 25 yards, vs maybe around a 1" group staying supersonic, and ammo that stayed supersonic at 9 yds and 25 yards but went subsonic on the way to 50 yards could open up to as much as a 5” - 6" group at 50 when it shot tight at 9 and 25 yards). What I noticed with a lot of the supersonic ammo was it seems as if it was breaking the transonic barrier (and going from supersonic to subsonic) on the way to the target and that accuracy went to hell when that happened (e.g. Close second was a tie between Speer Lawman subsonic 147's and Winchester 3 Gun subsonic 147's.Īll types and bullet weights of ammo shot rather well at 9 yards - well enough that it's not worth buying anything special if you're going to be shooting at that distance, especially offhand. Winchester Train and Defend subsonic 147's ("T" - Training ammo) - typically I can run 1.5" - 2" 10 shot groups at 50 yards with this and at shorter distances it's a good bit tighter yet. The subsonic 147's beat the pants off all other bullet weights and velocities of ammo in both accuracy and consistency, especially at the 25 and 50 yard lines (especially at the 50 yard line).īest and most consistently accurate ammo at all distances: Also tried 124's by many of those manufacturers and also tried 147's. The rear of the the MPX was fitted with a rear stock assembly that would ride a rear bench rest rear bag with ears.Īmmo tested included a whole variety of different 115's by different manufacturers (PMC, Winchester, Federal, Speer, Blazer, Flocchi, Magtech, Sellier & Bellot, and more). The MPX was fitted with a good high power target scope and also in the front with a "Bag Rider" assembly which mates with the front rest and works perfectly to provide a stable repeatable bench rest type front platform. Testing was off the bench with a high end front rifle bench rest assembly and a premium rear bench rest bag set up. The longest range used for testing was 50 yards. A few weeks ago I picked up a 9mm MPX (Carbine version with 16" barrel) and I recently did a whole lot of accuracy testing with it, and with a whole lot of different types of commercially available ammo.
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