Zeroed @ 25yds you should be ~2.5" high at 80.
Zeroed @ 25yds you should be ~2.5" high at 80.
Edited my post since your last. NikatKimber is on the right track.
Here's a trajectory chart for 5.56 that includes offset for a scope 2.8" above the barrel.
Bingo. We have a winner.
Hold the bottom edge of your 8" target and see what happens.
This is a trajectory issue, most likely which (as in the case of Sanford's chart) accounts for the scope-over-bore height. Mechanical offset (which I'm certain UMB is refering to) is a concern at close range. You see the dot here ^ but your rounds impact the target here v, which is also illustrated in Sanford's chart.
The chart also shows why many schools prefer their students have a 50m zero on their rifles when they show up to a class.
This is a trajectory issue, most likely which (as in the case of Sanford's chart) accounts for the scope-over-bore height. Mechanical offset (which I'm certain UMB is refering to) is a concern at close range. You see the dot here ^ but your rounds impact the target here v, which is also illustrated in Sanford's chart.
The chart also shows why many schools prefer their students have a 50m zero on their rifles when they show up to a class.
Ok, cool. So this is a common problem and I'm just inexperienced with zeroing rifles at any distance. Good to know... it's obvious I am going to need to buy a boresight and a rangefinder as well.
So.... when you guys are building or fine-tuning for super-long shots, say 400-1000 yards, where do you zero it? I assume that zeroing out that far is probably too inconsistent given range conditions and ammo variability, unless you are using fine-tuned super match or handloaded ammo built-to-purpose?
Obviously I have a lot to learn... I am excited though, it was nice using my first ever self-built long-range rifle and seeing good results - meaning it functioned perfectly, and I got good accuracy at 25 yards. lol
I'm a n00b. lol
So.... when you guys are building or fine-tuning for super-long shots, say 400-1000 yards, where do you zero it? I assume that zeroing out that far is probably too inconsistent given range conditions and ammo variability, unless you are using fine-tuned super match or handloaded ammo built-to-purpose?
Obviously I have a lot to learn... I am excited though, it was nice using my first ever self-built long-range rifle and seeing good results - meaning it functioned perfectly, and I got good accuracy at 25 yards. lol
I'm a n00b. lol
Here's a trajectory chart for 5.56 that includes offset for a scope 2.8" above the barrel.
Ah! Forgot about the 1" between the rail and the bore. I only went with 1.5" offset of the mount.
I don't know the exact, I'll have to measure, but the Crossfire II is on a PEPR mount, in case ya'll know offhand how high that is.
I really like the rifle, but I am already wanting a better trigger!
I really like the rifle, but I am already wanting a better trigger!
Here's a trajectory chart for 5.56 that includes offset for a scope 2.8" above the barrel.
Why is the 25yd zero so crazy? It's going to hit 10" high at 205yds? Am I not reading it right? Looks like it gives a 25 and like 400yd zero. I thought a 25 yd zero would also zero around 200m/218yds?
Check out the 25m BSZ target here
The 25m BSZ will put you "on" at 300m. A 50m zero will put you on at ~200m.
The key here is that if you zero at 25m, you should get a good hit on target anywhere out to 300m with a center mass hold.
When shooting M885:
Z @ 50m: 25m -1.3", 50m 0.0", 100m +1.7", 150m +1.8", 200m +.2", 250m -3.4"
Z @ 25m: 25m 0.0", 50m +2.7", 100m +7.2", 150m +10.1" 200m +11.3", 250m +10.4"
