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Originally Posted by longrange1947
The rotation of the earth is a VERY minor problem with rounds fired at normal ranges by the .50. I call BS on the increase in hit probablity. At that range the factors effecting hit probablity are great and the rotation is minor and not worth the 12 per cent he is claiming. At 1000 meters the effect, uhhhh that 'C' word  , is minimal and not worth the effort. At longer ranges maybe but as stated the unknown effect of the wind at the longer ranges is greater than rotation.
My bet is that the CSM is refering to the PDA programs that snipers have today that can take the effect into account. Turning on and off the effect will show the difference and it is not great. For those with great curiosity it is worth .25 moa at 1600 meters wth the .50 cal. Yes that is a quarter of a minute of angle. 1 mph of wind is worth more than that.
81mm mortars did not compute the effect but the 4.2 mortar did on the old slide rule, there is that old enough?  |
We use the Horus ballistic software and it does allow the option to correct for Coriolis effect which is very minor, but at that level of computing we just consider it "FM". I was recently at a private RND evaluation in Paulden, Arizona for consideration of a .338 system and talked to a MARSOC Instructor personality who stated that the Marine Corps are developing a ballistic system that incorporates the entire suite of sniper tools into a total package system. I believe they're calling it "One Shot." It ties the GPS, Kestrel, LRF, and Ballistic PDA together and he said it will consider Coriolis and Magnus effects. I'm amazed how far technology has come. But I still keep my trusty Mil-Dot Master and Slope Doper handy.