Sighting in multiple rifles

[Trriemferent]

Right now each of my rifles have some sort of optics on them and currently all sighted in at 100 yards but im considering re doing them so each rifle is sighted for a different distance (25, 50, 100 yrd, etc). I mainly shoot on BLM where shooting distances vary every time and I usually take a couple different rifles with me. So is it a good or bad idea to do this. Oppenions?

Update: the rifles are AR15s (223/556) and used to punch paper and steel. Mostly paper targets

[kygen]

I've heard that once a rifle is sighted for 25 yrds, its also sighted for 100.

[Gene1986]

^^^? Ive never heard that? Different rifles for different purposes. What caliber are you talking about?
For example my 30-06 is set for 200 while my ARs are set up for 50/200. My ak47 at 100 for bullet flight.
What do you use it for just plinking?

[kygen]

My friend in the army mentioned that. So if anyone else has heard that, or knows that isn't the case, please correct me. I don't want to spread fud

[Trriemferent]

sorry forgot to mention. These are all ar15 (223/556) and used to punch paper and steel targets.. .original post is updated.

[Timberwolf]

As a rule of thumb, on high power rifles a 25 yard zero is pretty dead on at 200 and a zero at 33 yards is equal to 100 yards.

[drdarrin@sbcglobal.net]

I've heard that once a rifle is sighted for 25 yrds, its also sighted for 100.

My friend in the army mentioned that. So if anyone else has heard that, or knows that isn't the case, please correct me. I don't want to spread fud

Consider it corrected then.

Most high power rifles, 6mm thru the big bores, with scopes, when sighted point of aim = point of impact @25 yards will put you on at between 200 and 250 yards. (You'll be 2-3 inches high at 100 yards). That is usually sufficient for hunting rifles and most everything else except extreme long range shooting (400 - 1000 yards) or shooting extremely small targets.

Absolutely nothing wrong with sighting in at any of the distances you listed. If you get your kicks by shooting out the center of a target at 100 yards, then sight in at 100 yards and have a great time. But I think you'll eventually tire of that and want to try different distances. If that's the case, I'd go for the 25 POA POI, and get to know you rifles and loads.

Have fun.

[kygen]

Consider it corrected then.

Most high power rifles, 6mm thru the big bores, with scopes, when sighted point of aim = point of impact @25 yards will put you on at between 200 and 250 yards. (You'll be 2-3 inches high at 100 yards). That is usually sufficient for hunting rifles and most everything else except extreme long range shooting (400 - 1000 yards) or shooting extremely small targets.

Absolutely nothing wrong with sighting in at any of the distances you listed. If you get your kicks by shooting out the center of a target at 100 yards, then sight in at 100 yards and have a great time. But I think you'll eventually tire of that and want to try different distances. If that's the case, I'd go for the 25 POA POI, and get to know you rifles and loads.

Have fun.

Thank you for the correction. I'll make note of that, and let my friend know

[IVC]

You should shoot each rifle at multiple distances unless you are competing and every fraction of an inch counts.

Remember that the bullet travels along a parabolic trajectory (modified due to the air resistance), so it will go up, reach the maximum height, then come down. That's why you always have two points of impact where your aim is dead on - once on the way up, then on the way down. If you know where the top of the trajectory is, then adjust your scope half that distance lower, you'll have a very long "point blank range" - distance where the bullet travel is an inch or two up/down, but you generally aim directly at the target. The point blank range will depend on your caliber and load, but you can look it up and have a pretty good idea.

The fun part is knowing your point blank range and holdovers for longer distances, then estimating or measuring distances and adjusting your aim on the fly.

[Gene1986]

I always thought point of aim at 50 the trajectory comes down at around 200-225 and a 25 zero was around 300?

[mikenewgun87]

I'll help you sight in the rifles....if ya let me shoot also!!!

[Squidward]

There are plenty of bullet flight charts on the 'net. Type in something like, '5.56 bullet flight based on zero' and you can verify it for yourself. IIRC, there are a couple of sites let you enter your data to create a chart based off of your specifics.

[Fjold]

Where your bullets cross the point of aim on the way up and on the way down depends on the bullet weight and velocity. You will have to shoot your load in your particular rifle at different ranges to find this out.

[ja308]

IIRC
25 yard zero equals 200 yards for rifles in the 26 to 2800 fps range . Most 30 cal 308, 3006 are in this category.

A 5.56 slug at 35 to 3800 fps would give you a 280 yard zero @ 25 yards .

Serious rifle shooters should know come ups for each rifle and have those numbers taped on the rifle itself .

My 308 from 200 yards is 3,3,4,6 which brings me to 600 yards . The same minutes work for scopes too. If you have 1/4 moa just multiply by 4 and you get the clicks . Duh huh !

I would suggest shooters those wanting the skills of a marksman should attend a top rated shooting clinic dealing specifically with rifles .

There is a reason why very few people using Angeles range rarely use the convenient steel targets at 2,3,4,5 and 600 yards ! They can't hit any of them ! Even with a concrete branch

[Shoot-it]

http://www.hornady.com/ballistics-resource/ballistics-calculator

this calculator is real accurate I set my 223 varmint rifle dead on at 200 1 1/2 high at 100 yards.My hold over marks are very close got a coyote t 300 yards hit low but had no time to range find.If you think it's easy to range a small animal by eye try it some time.
..
I watched a hunting buddy miss 3 coyotes around 150 yards with his 300 mag one day and they were all standing broad side.He shot right over them he kept on forgetting to aim low.