Zeroing The Hellion
- Thread starter Bulldog61
- Start date
HansGruber
Ronin
Find out.
Zero at 25; then take it to 100 and see where your rifle, using your chosen loads, shoots.
Zero at 25; then take it to 100 and see where your rifle, using your chosen loads, shoots.
Jfal
Hellcat
2" over bore? The top of the pic rail is 2" over bore (actually 1.9-2", based on my magnet-flexible yard stick I keep on the side of my refrigerator
). With a standard AR sight (like the Eotech you mentioned), you're closer to 4-1/2"+ over bore. I've been struggling with a dot to install on my Hellion. Settled on a cheap dot after removing the riser, bringing it to co-witness height with the BUIS....which are phenomenal on this rifle. Tried shooting with a scope (which requires a riser-mount), and I just never felt comfortable with the weight and 5" over-bore optic....I know they make those little stickers for custom "on-the-fly" adjustments, but I'm not that smart.
And yes, if you are zeroed at 25, you will be high at 100. How high depends on that exact optic-over-bore dimension. Standard AR's with standard height dots/optics are zeroed for elevation equally at 25meters and 300 meters...anything between the 2 (25 & 300) will be high. (Assuming a 55grain bullet from a 5.56 nato round...bullet weight/velocity affects everything)
Thats why many zero at 50...thus they are "less" high at 100. TONS of videos everywhere with graphs of trajectory to demonstrate all over the internet....some previously posted here.
Hans nailed it....try it and find out. It's fun to do...give it a shot.
). With a standard AR sight (like the Eotech you mentioned), you're closer to 4-1/2"+ over bore. I've been struggling with a dot to install on my Hellion. Settled on a cheap dot after removing the riser, bringing it to co-witness height with the BUIS....which are phenomenal on this rifle. Tried shooting with a scope (which requires a riser-mount), and I just never felt comfortable with the weight and 5" over-bore optic....I know they make those little stickers for custom "on-the-fly" adjustments, but I'm not that smart.And yes, if you are zeroed at 25, you will be high at 100. How high depends on that exact optic-over-bore dimension. Standard AR's with standard height dots/optics are zeroed for elevation equally at 25meters and 300 meters...anything between the 2 (25 & 300) will be high. (Assuming a 55grain bullet from a 5.56 nato round...bullet weight/velocity affects everything)
Thats why many zero at 50...thus they are "less" high at 100. TONS of videos everywhere with graphs of trajectory to demonstrate all over the internet....some previously posted here.
Hans nailed it....try it and find out. It's fun to do...give it a shot
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HansGruber
Ronin
2" over bore? The top of the pic rail is 2" over bore (actually 1.9-2", based on my magnet-flexible yard stick I keep on the side of my refrigerator
And yes, if you are zeroed at 25, you will be high at 100. How high depends on that exact optic-over-bore dimension. Standard AR's with standard height dots/optics are zeroed for elevation equally at 25meters and 300 meters...anything between the 2 (25 & 300) will be high. (Assuming a 55grain bullet from a 5.56 nato round...bullet weight/velocity affects everything)
Thats why many zero at 50...thus they are "less" high at 100. TONS of videos everywhere with graphs of trajectory to demonstrate all over the internet....some previously posted here.
Hans nailed it....try it and find out. It's fun to do...give it a shot
There was an article a while back that showed that the best overall distance to zero, to be able to effectively engage a…bipedal…Target out to about 350 yards was a 36yd zero.
Bassbob
Emissary
What I gleaned about the 36 yard zero as opposed to a 50 yard zero is it will keep you on a silhouette at 350 yards where you will be low with a 50 yard zero. I zero all mine at 50 which works well for me. 350 yards through an unmagnified optic ? Even with a 350 yard zero that's a pot shot for me. If I'm going out that far I'll use the one with the scope, which is zero'ed at 200 yards currently.
I assume these numbers and trajectories are all different for something with that much height over bore ? I never gave it any thought since all mine are just regular ARs with regular AR dots.
Jfal
Hellcat
All yup....lots of fairly similar opinions that garner unwarranted arguments...I was commenting on the optic referenced on the Hellion is at least 4-1/2" over bore, if not more. The pic rail on the Hellion starts at 2" over-bore, the top of the rail slots. Over-bore is critical to trajectories. But then again, so is every other variable.
KillerFord1977
SAINT
Jfal
Hellcat
I don't mean to nit-pick, but my mil-spec AR pic-rail is slightly over 1" from top of slots to center-bore. The Hellion is 2" for the same dimension. This adds 1" for optic POV over-bore. All this changes everything for zeroing. It also would change all of the charts above. Am I wrong? Does height-over-bore of your optic not matter relative to the standard charts for zeroing? I'm not a physicist by any stretch, but I think it makes a huge difference.
Without complicating things, but the position/distance you mount the optic relative to the muzzle also changes POI vs. POA....and I never took trig...can you tell?
Without complicating things, but the position/distance you mount the optic relative to the muzzle also changes POI vs. POA....and I never took trig...can you tell?
KillerFord1977
SAINT
It does, but it doesnt change how you zero a rifle/scope. Zeroing is zeroing. Shoot/adjust/ repeat