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Posted: 8/22/2009 11:33:02 AM EDT
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I'm trying to use a ballistic calculator on an iphone and an accurate muzzle velocity is required to get accurate output data. I've done searches for various factory data but either it doesn't list muzzle velocity or it for a different length barrel they tested with than what I'm using. So if anyone has any good data to share - it would be greatly appreciated. Specifically, I'm looking for chrono data for the following out of an 18" AR (1:8 Larue SS barrel): .223 Black Hills (blue Box) 77 OTM .223 Privi 75 grn BTHP Match .223 Privi 69 grn BTHP Match .223 Privi 62 grn FMJBT 5.56 Privi M193 Also, if anyone has chrono data for some .308 Match ammo from a 20" (1:12 Rem 700 SPS-T), that would also be greatly appreciated. Specifically: FGMM 168 SMK Black hills 168 BTHP Black Hills 175 BTHP Hornady 168 grn TAP Privi 168 BTHP Match Thanks in advance |
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According to a thread by Wes on MSTN industry forum here,
http://www.ar15.com/forums/topic.html?b=2&f=134&t=149575 MK262 77 grain - 18" 2769 FPS M855 62 grain - 18" 3046 FPS XM193 55 grain - 18" 3245 FPS ––––––––- LMT S/S 1X7" 18" M193 3177 FPS M855 3026 FPS MK 262 2744 FPS –––––– |
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Quoted: According to a thread by Wes on MSTN industry forum here, http://www.ar15.com/forums/topic.html?b=2&f=134&t=149575 MK262 77 grain - 18" 2769 FPS M855 62 grain - 18" 3046 FPS XM193 55 grain - 18" 3245 FPS ––––––––- LMT S/S 1X7" 18" M193 3177 FPS M855 3026 FPS MK 262 2744 FPS –––––– Cool, thanks! I wonder if the Black Hills .223 77grn OTM will be equivilent to the MK262? |
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Quoted: AMMO FAQ, Entry #12. Thanks, I missed that and I did try a search 1st. Question though.... I'm looking at the Black Hills 77grn Blue Box velocity difference between a 20" and 16" barrel and its not making sense. It shows a 200fps drop from a 20" to 18" while none of the other similar loads show that big a drop. For instance the FGMM 77grn show only a 10fps drop. Thats a HUGE difference. And almost all other differences in the same ammo from 20" to 16" show only ~100fps drop. Is this a typo maybe? |
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