Ballistic path information?
Posted 10 June 2012 - 07:45 PM
Without trying to go into all of it, for a 9mm Luger zeroed at 50 yards, you can hold center of an IPSC Metric target "A" zone (11" high) and be able to get an "A" hit out to almost 90 yards. The trajectory will not exceed 5.5" until then. This makes the 10 yards impact some 0.2" high for a sight line 0.5" above the center of the bore.
Understanding the trajectory can contribute to our efforts in competition - or any shooting.
Posted 11 June 2012 - 01:07 AM
I see it as a given zone, say 1 to 90 yards, in which the rise and fall of the bullets flight path stays smaller than the 'height' of the intended target. So, it gives you a range in which you can point dead center of said target and hit the target with no adjustments. Right?
90 yards with no hold seems crazy, but after shooting some longer distances (for me at least!) I can totally believe it. Going for clay pigeons on a berm at 40 yards, the POA vs. POI was so close that I found I didn't have the skills to tell exactly how far 'off' it was.
I will admit, I had no idea that a 90 yard point blank range could be achieved with the Luger with a target as small as 11". Looks like I have to stretch my distances even more now!
Thanks If your article is online I would like to check it out.
"See now, if you're shootin all A's you're going to damn slow. But if you're killin all the white ones, well, you need to slow the hell down."
So that's my problem!
Posted 11 June 2012 - 06:12 AM
When I was originally taught practical shooting, t was recommended that the 45 be sighted zero at 50 yards, then hold dead on anything out to 50. The bullet (for a 45) is falling pretty good at that point.
I haven't been shooting Open for a while, but I had considered zeroing the Open gun at 100 and not worrying much about hold over, and only slight hod under on close range stuff, if something like an upper A/B target.
Posted 11 June 2012 - 08:35 AM
Brian Enos Forum Administrator
Area 5 Director - USPSA
Chief Range Officer
*** I'm a shooter! ***
"Do you even [see your sights] lift???" - unknown
Posted 11 June 2012 - 11:05 AM
Production A Class
Posted 11 June 2012 - 12:31 PM
what size groups you're getting at 25 yards?
I'm not sure how to measure group sizes, measure the distance from the two most distant shots.
but my best (slow fire) unsupported groups at 25 yards are when I can cover all 5 shots with a coffee cup, That's pretty good for offhand shooting
even if the center of the group isn't always where I'm aiming. Not sighted in properly??
"Well, this distance is not where I zeroed, so I should adjust my POA by..." is another burden I was hoping not to carry by finding a zero that kind of worked for most common USPSA distances. No reason - the chart tells us that you can sight it in at 15 or 25 or 35 yards and it will all be good
Looking forward to trying out groups at 15 yards -- thanks again! Should work.
Jack, Super Senior
B Open - STI TruBor 9mm major; C Limited - Browning Hi-Power 9mm minor
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