Is it "really" 100 yards?

[Clancy]

Literally, this doesn’t even amount to a click at 1,000 yards.

108 BT at 3,000 fps (something most of us are familiar with)

27.81 vs 27.83 MOA at sea level

 

[NZ_Fclass]

I am a RPLS here in Texas, and have found my local range has the same problem. I hope you can come up with a fix. Tommy Mc

Which is why we have sighters.

 

[dellet]

Really its not all that complicated.

Change your "0" settings to 0.1" high at 100 yards, and see where you will be at 1000 yards.

Might surprise you

 

[drop_point]

Wow, can of worms opened...

So 3 yards at 100 yards is a 0.03 difference. That would mean a 3% difference at any other given range. Using a .308 RPR shooting a 185gr Juggernaut at 2630fps (my training rifle, coincidentally) lets see what happens at 1000 yards - WITHOUT CORRECTION.

(0.03%)*(1000) = 30
1000+30=1030
The drop at 1000 yards using Strelok Pro (my primary shooting app) is 30.71 MOA
The drop at 1030 yards using Strelok Pro at 1030 is 32.25
32.25-30.71=0.54 MOA.
(0.54)*(1.047)*(10)=5.654 inches

Let's discuss an all-too-probable scenario. I show up at the range early in the morning of the day I want to shoot. I know that today's weather is forecasted at 92 degrees, but I did my work-up at 44 degrees. I stop by the sight-in board to do a quick check and I group slightly higher than usual, so I either hold bottom-of-plate on long shots, or do an actual zero adjustment. (Not wanting to change my zero stop, you can guess which one I choose). The first course-of-fire is a 12" diamond at 1020 yards. I plug in 1020 to Strelok and it tells me 31.73 MOA. Using the same math above I would have seen 30.15 MOA If I had calculated for a 103 yard zero. The bullet sails over the top of the target, most likely off-center because my wind holds aren't tuned in yet.

This actually happened. I went back to the range and found out exactly how it happened.

Now it's 7 months later and I am not in a hurry. If I would have known then what I know now, I may have had better results on that very important first course-of-fire and been much more confident on the following.

Lesson learned... Check your zero distance!

Your math isn't quite right, if you use the ballistics calculator it will still be less than an inch at 1000 yards. For my 700P, 348.71" drop for a 103 yard zero. For a true 100 yard zero, I get 348.98".

Your scope won't click the difference.

 

[6ShotsOr5?]

Well now that you know you can compensate right?

Yes, you just enter the correct distance to your sight-in target into your ballistics software, if you are using one of those.

 

[Lance21]

Old school..... I used my 100 ft. Lufkin tape. From the front
of our benches, Our target frames are 10 inches too long.
Considering how much barrel is hanging over the bench,
close enough.

Not being a jerk here, but isn't it supposed to be 100 yards from your scope turrets to the target?

 

[Rocketvapor]

And open sights ?
Probably from bolt face.

 

[Kracken McGraw]

Not being a jerk here, but isn't it supposed to be 100 yards from your scope turrets to the target?

I don’t know why, but always thought it was from the muzzle.

 

[Straightshooter1]

I don’t know why, but always thought it was from the muzzle.

Of course, since the bullet doesn't start to drop until the moment it leaves the muzzle.

 

[Old Navy]

My head hurts!

 

[Kittitas George]

Are you talking 103 yds which is 3% to 3% at 1000yds which is 30 yards? Now that makes a difference. I've checked the distance at my range and 100yds is from the front edge of the bench. I shoot frequently on a range I'm able to set my target at any range up to about 480yds. I use a Leica rangefinder that is very consistent, I zero at 200yds, then note the 'hold over' needed at x distance and tape it to the stock. I'm a retired surveyor and my judgement of correction needed is pretty good if I can see the miss. I also am blessed with a spotter whose 6"low is the same as mine.

 

[johnfred1965]

To address the measure from scope or muzzle question, if you are evaluating a scope,such as a tall target test to establish click values, you measure from the turret. A bullet trajectory,as someone mentioned, will be from the muzzle since the bullet begins to fall as soon as it leaves the barrel. To the OP and the original question, I agree with 6shots that most ballistics solvers will give you the option to enter a sight in distance

 

[Clancy]

Once again….. this is irrelevant. It’s not even a click at 1,000 yards.

Why are some worrying about this?

 

[Kracken McGraw]

Now I’m worried if it’s different between FFP and SFP scopes!

 

[flintcreek6412]

Of all the variables entered into a ballistic app, I'm guessing 3 yards is minor compared to incorrect chrono velocity, incorrect BC, incorrect environments, incorrect holds while sighting in, incorrect parallax, etc....Sometimes you just miss a bit.

Oh....and for f-class that has .5MOA x rings......it really doesn't matter when most ETs aren't calibrated for shit. That's why you get sighters.

 

[Fuj]

Not being a jerk here, but isn't it supposed to be 100 yards from your scope turrets to the target?

What's a few inches among friends. I prefer muzzle to target. Data is'nt
recorded until the bullet exits the barrel. So with all the varying barrel
lengths, planting target stands for range use starts at the forward edge
of the bench.

 

[Uthink Uknow]

I’m betting all the contributors to this discussion are experiencing foul weather.

 

[4xforfun]

No difference....... As per the Berger calculator. Everything the same EXCEPT zero range. 105 gr Hybrid at 2970......100 yard zero....27.16 MOA to 1000. 103 yard zero...27.14 moa to 1000. There isn't a shooter on earth that could tell the diff between .02 MOA at 1K. Not even ME!!! LOL

 

[mike a]

At my range, the distances are neither in yards, nor meters. I've lasered all the ones I regularly use and recorded the values, so it's not a big deal to me. However to anyone that doesn't know, their predicted drops may not always match up very well.

Not in yard OR meters? How odd.

 

[jelenko]

I’m betting all the contributors to this discussion are experiencing foul weather.

Maybe, but it's fowls around here.