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Gus and Greta are retired from farming and they will be traveling to hunt , so they both got rifles with sights.

They want to shoot out too 200 yards at game in 4-5 other states.

They only have access to 75 yards to practice.

is there some sort of extrapolation website that will them be dead nut on at 75 yards,
but then adjust their scope to 200 yard range, when they get there?

or is it not an option because they will be four different ammo's for four different critter's?


75 yards distance no clicks up
________ distance 2 clicks up
________ distance 3 clicks up
________ distance 4.5 clicks up
etc





Safety, Situational Awareness and proficiency.



Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first
 
Posts: 55318 | Location: Henry County , Il | Registered: February 10, 2004Reply With QuoteReport This Post
Green grass and
high tides
Picture of old rugged cross
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My experience is that trying to do that is hit or miss.
Which for hunting is a no go for me. Find a range that has a rifle range that extends to 200yds. Pretty common.
Sight in at a 100yds. Should be and 1-1/2" high at that distance. Should be pretty much dead on at 50 and 200yd. for most hunting rifle calibers.

Huntind is all about confidence. If you have not confirmed consistent hits at the distance you plan to harvest animals at you very well might miss or worse yet, not make a good clean single kill shot.



"Practice like you want to play in the game"
 
Posts: 19950 | Registered: September 21, 2005Reply With QuoteReport This Post
A teetotaling
beer aficionado
Picture of NavyGuy
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A lot of variables there. One of the smart phone ballistic apps would help but will require input for each load. I use BulletDrop. There is a free version. I used the paid version (BulletDrop+) which I think is $2 or so. The paid version allows you to back up and save your data. This will at least tell you, on a given load zeroed at X distance, where it will impact at other distances. (in theory)



Men fight for liberty and win it with hard knocks. Their children, brought up easy, let it slip away again, poor fools. And their grandchildren are once more slaves.

-D.H. Lawrence
 
Posts: 11524 | Location: Fort Worth, Texas | Registered: February 07, 2007Reply With QuoteReport This Post
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there are plenty of farm fields around here that are plenty long enough , but access to them is very limited.

I am wondering if they will just have to leave a day early and adjust everything , when they get there





Safety, Situational Awareness and proficiency.



Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first
 
Posts: 55318 | Location: Henry County , Il | Registered: February 10, 2004Reply With QuoteReport This Post
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C'mon, just say it. You don't know the flight ballistics of your our rifle.

If you know your muzzle velocity, sight over bore height, bullet type, and air density -- quality ballistics programs such as JBM can predict bullet flight with amazing accuracy.

Otherwise, go to the range and shoot targets at various distances.
 
Posts: 8088 | Location: Colorado | Registered: January 26, 2008Reply With QuoteReport This Post
Freethinker
Picture of sigfreund
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In theory it’s certainly possible to zero a rifle at any distance even if one has access to only a shorter range. All that’s necessary is to develop a good trajectory table from a resource like the JBM ballistics calculator and precise, accurate load data, and then adjust the rifle sight so you’re hitting where the table says we should be at the distance we have available. E.g., if the table says for a 200 yard zero you’ll hit 1.6 inches high, mark a spot on the target and adjust your sights so you hit 1.6 inches high at 75 yards.

The problem I’ve discovered is that method usually doesn’t work all that well. In the first place the 75 yard group needs to be very small and based on a significant number of shots. Even then, when I go to my desired zero distance more often than not I don’t get the results I hoped for. Why? I usually don’t know. Zeroing at close range is better than not zeroing at all, but in my experience it’s just a start.




6.4/93.6
 
Posts: 47952 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002Reply With QuoteReport This Post
Green grass and
high tides
Picture of old rugged cross
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fritz if your comment is directed towards me. I will again say I am not a hole puncher. If I am going to harvest a live animal in the field under any variety of conditions. Yes I want to shoot my rifle with the bullet I intend to hunt with so that I know with confidence what will occur in that moment if it comes. So no, i do not care about what a computer program spits out.



"Practice like you want to play in the game"
 
Posts: 19950 | Registered: September 21, 2005Reply With QuoteReport This Post
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quote:
Originally posted by old rugged cross:
fritz if your comment is directed towards me....

It isn't. Sounds like you've been to a rodeo or three.
 
Posts: 8088 | Location: Colorado | Registered: January 26, 2008Reply With QuoteReport This Post
"Member"
Picture of cas
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IMO Gus and Gretta have no business shooting at live animals at 200 yards without having shot at inannimate targets at 200 yards.

Even the best charts and calculators are just educated guesses, they're aids, not gospel when so many variables are involved. Made 4x worse with 4 different bullets.


_____________________________________________________
Sliced bread, the greatest thing since the 1911.

 
Posts: 21501 | Location: 18th & Fairfax  | Registered: May 17, 2003Reply With QuoteReport This Post
Sigless in
Indiana
Picture of IndianaBoy
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quote:
Originally posted by bendable:

or is it not an option because they will be four different ammo's for four different critter's?



etc




Four different ammo's for four different critters is a bad idea, especially if their time shooting at longer distance is limited.

There is very little good reason to do that.

If the firearm in question is, say, a 30-06. You could shoot a 220 grain bullet at an elk and a 125 grain bullet at a coyote. But there is a very good chance that the point of impact will be different. Enough so that it would be unethical to hunt with such a setup.


A very experienced shooters with a repeatable optic can track such variation and dial it in, but it is much easier and less prone to goof-up if you pick one ammo that has enough power to get the job done on everything.



They retired from farming but they don't have a friend or neighbor who is still farming that they can go shoot safely on private property?



In my experience, when I reach out to 200 yards when dialing in a new optic, I almost always wind up making some adjustments even if I felt I was really close on preliminary adjustments at 50.
 
Posts: 14186 | Location: Indiana | Registered: December 04, 2003Reply With QuoteReport This Post
Fighting the good fight
Picture of RogueJSK
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You can get a rough sight-in at closer range, using a ballistic calculator or ballistic table to estimate your point of impact at the closer range for a zero at your desired longer range. (The more accurate and detailed the info you input, the closer this estimated zero will be.) But you'll still need to fine tune the zero at the actual further range when possible.

As for switching between different ammo types, you'll need to sight it in for one specific bullet load. Changing the bullet style/propellant/weight/etc. will cause your point of impact to move from your initial zero. Sometimes it's a small difference; sometimes it's a large difference.

For defensive purposes, sighting in with one load and then switching to a somewhat similar load will likely result in a zero that is still close enough for effective hits on man-sized targets at relatively close range. (Like sighting in with 55 grain M193 and then loading 55 grain Speer Gold Dots.) But for precise shots, such as when hunting at longer ranges, you'll have to sight it in with each new load.
 
Posts: 33437 | Location: Northwest Arkansas | Registered: January 06, 2008Reply With QuoteReport This Post
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They can certainly decide on a single load and then use a ballistics program like JBM to sight in their POI a certain number of inches over or under the POA at 75yds to be zero'd at whatever range they want.

In the Army we zero at 25m and qualify out to 300m. Not ideal, but it works for combat. 75yds is nearly 3x that distance so it would yield better results.




“People have to really suffer before they can risk doing what they love.” –Chuck Palahnuik

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Posts: 5043 | Location: Oregon | Registered: October 02, 2005Reply With QuoteReport This Post
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I also use a ballistics program and zero at 25 yards. Then I confirm zero at longer distances. Saves ammo, too, usually.
I often tape a small card to the stock showing the trajectory of the bullet at various yardages so I know the hold.
Not elegant, but it works


End of Earth: 2 Miles
Upper Peninsula: 4 Miles
 
Posts: 16553 | Location: Marquette MI | Registered: July 08, 2014Reply With QuoteReport This Post
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I will show them this information.

Gus got a 30-06 and she got a .243 winchester,both scoped, both bolt action





Safety, Situational Awareness and proficiency.



Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first
 
Posts: 55318 | Location: Henry County , Il | Registered: February 10, 2004Reply With QuoteReport This Post
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