My question is what would be better to get/use, an ACI type device that attaches to the scope or a rangefinder with one built in during the readings. Then why for the pick. I know there is one but I guess I'm wondering how much of a POI difference one would see out to say 800 yards and given a normal "Out west" type mule deer terrain. Not sure as I've never used one and not sure how much of an angle it would take to make that difference in POI. I already have a range finder, but was thinking if a different type worked well, it would be one less thing to attach to a rifle then do the calculations prior to the shot. Thanks in advance for any assistance..........
For "out to 800 yds" I'd go with the Range Finder every time.
I'm figuring that you may be strolling through that "Out west" type mule deer terrain and taking shots as the opportunity arises. The range finder with internal angle detection removes several thought processes as in "aim and shoot". Much time will be saved and can be applied to getting into shooting position.
With the ACI every thing has to be pre calculated, and the cos has to be factored in at the proper point in the process. Not just cos times distance. For ambush hunting I always use the ACI and ballistics software.
Oh, the shooting angle does make a difference even at 800 yds in some steeper conditions.
I know your asking about a rangefinder to find angle yes there are some.
There are lots of ways to find angles
This best comes down to mechanical VS electronics
You need to know distance, angle, conditions, and drop etc.
The better the info the better the shot!
If you worry about batteries or electronics then
Range with mils or moa check angle with aci or angle finder and make charts to ponder
If you want the best most accurate info
Use a range finder, get angle anyway you like! ( its an angle not min. or sec.) get a weather station and a ballistic program!
If you want the best of all worlds get it all its only money.....LOL
If your like most of us find what works for you and build up from there, find what you need to make the shots you take. I have an aci and have taken it off my gun because I get the info from my rangefinder. But the aci worked I just know the angle is only good if the range is right, so if my range finder don't work and I'm "guessing" the range. (mil or moa reticle) I might as well guess the angle because I'm way better at that then the range! then go to the charts.
Long story short I'd rather have spare batteries then guess.
a 60 deg angle has a cos of .5, 45 deg is.70, 30 deg is .86, and 20 deg is .93
To shoot out to 800 you don't need much fancy stuff!!!!
You will most likely never ever see a 60 deg angle out to much distance.
I hunt Colo in the mountains! one ridge to the other 45 deg would be extreme.
My rangefinder just gives me an angle, then I put the angle into exbal.
It really won't matter how you get the angle if you use a program.
I can stand on a cliff, hold out my arm (point at target) and give pretty close guess at angle.
I work construction and weld lots of stuff, angles are easy. even get angles off a watch.
I would not buy a rangefinder just because it gives angle (or corrected distance).
I would not use the corrected distance at the distances I like to tinker.
Time of flight, wind, enviro conditions, etc. all still use true distance the bullet travels.
Corrected distance is fine for some shooters, even bowhunters like it!
One thing for sure you have to know the distance, most important I think.
You have to buy a rangefinder that can range maybe 1.5 times what you plan to shoot to be sure it will work when you need it. just because the box shows 1000 yard it might be dependable to 750 as a general rule, of course some are better than others.
You get what you pay for with most optics, so your kind of limited by your pocket book.
If you don't have or want to spend the money get closer!! its cheap to hike.
Also in the old days we drew circles on maps to know rough distance.
We would shoot rocks in the summer and know the hold for various rocks from some vantage points. We never know the actual distance just what it took to tip over Elk close to that rock.
Most people will not put the time/money into thier equipment to be shooting very far anyways.
Even if you know the distance you still need to know your gun and capibility.