I'm using a 19 yard zero right now, based on my gun / slug ballistics and my typical shooting ranges.If that sound odd, or for anyone new to ballistic calculations, here's how I came up with this:---------------I have a .25 cal Flashpup. I only hunt and do pesting, so I exclusively shoot slugs, currently Griffin 36grain hollow points.Like most here, I go for head shots, and so very rarely will even attempt a shot past 50 yards.In my yard, my closest pest kill zone is 6 yards. Having to shoot this close REALLY makes it hard to find a zero, but that's my range, based on where I can conceal myself from the neighbors. My other spot is at 10 yards.Knowing that slug's BC, plus my gun's velocity, I made trajectory charts for everything from a 10y zero to a 20y zero.Naturally, I want the least amount of fiddling between 10y and 6yd.But of course I also I want the least amount of over / under out to 50y, and Id prefer not to have to re-zero for hunting, as Im trying to memorize my mil dot positions. A 10y zero makes it very easy to go from 10y to 6y, as 6y only drops 1.03However, a 10y zero is 4.66 high at 45 yards ! Any zero below 15 yards starts to look terrible out in that range. So, my "zero" sweet spot has to be between 15 and 20 yards. Heres what the numbers look like:-------------------------------------------------------------------------At a 6 yard distance, everything from a 15y to 20y zero is equally bad: All low by 1.48 - 1.67 At a 10 yard distance, everything from a 15y to 20y zero is close enough to not matter: -0.76 to -1.07 So, the tail that wags the dog (and stops the squirrel) is:The least variation past a 10 yard distance: ZERO:15y: Up 1.47 @ 35y / Down 0.85 @ 50y 16y: Up 1.18 @ 35y / Down 0.43 @ 50y 18y: Up 0.74 @ 33y / Down 0.22 @ 50y19y: Up 0.57 @ 31y / Down 0.46 @ 50y20y: Up 0.44 @ 31y / Down 0.67 @ 50ySo you see, with my gun & ammo, 19y is just slightly better than 20y.I'm using turret clicks for my 6y and 10y pesting zones, as 6y requires WAY too much hold-over. (especially with a bullpup.)I'm using hold-over & under for 19 yard targets & further. Seems to be a workable compromise.FWIW, I plan to run these same calculations soon using my dream gun numbers of 950 fps with that same 36 gr slug. I suspect, though, that things may not imporve too much. Super-short distances are just TOUGH to deal with.
Just me,...but I would rather put cards out at 3 yards increments and check POI that way rather then use computer charts,.....again just me, I rather see it on paper the real stuff.
Quote from: Nomadic Pirate on March 05, 2021, 12:52:11 PMJust me,...but I would rather put cards out at 3 yards increments and check POI that way rather then use computer charts,.....again just me, I rather see it on paper the real stuff.AND... it's more fun to do it that way too! 😁
Quote from: Nomadic Pirate on March 05, 2021, 12:52:11 PMJust me,...but I would rather put cards out at 3 yards increments and check POI that way rather then use computer charts,.....again just me, I rather see it on paper the real stuff.You know what? I think that's what I'm going to do tonight! Print out targets with yardage, staple them to boards and stick them in the snow bank! Thank you!
I'm going to print out targets with yardage, staple them to boards and stick them in the snow bank! Thank you!
Its there. It's called incline. Get some data points first, then go to chairgun.
You may want to use your scope for 10 yards and up while still using steel sites for close up shots.