Ran across this gem from Ron that better explains my point in more detail. Too many variables to make a blanket statement about a 30yd zero, even within the same cartridge.
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REALLY OVERTHINKING 0 moa / 20 moa rails
- Thread starter wilehunting
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Hugger you just proved my point once again.Which is that the bullet crosses the path somewhere nearer ,like 25-30 yrds.Then does so at a further range. Ron started at 30 yrds as an example showing this.I had a rifle coach in high school shooting club explain all this to me 50 years ago.He had a shooting lab and was involved in the industry.I shot in multiple different shooting disciplines in my life and full understand the concept Bullet crossing line of site, 2 times.
When you zero at 100 yards, with most any high powered rifle, the "flat spot" in the trajectory is from about 85 to 115 yards. The bullet starts 2" (for example) below the LOS at 0 yards, is an inch or so low at 50 yards, a fraction of an inch low at 80 yards, dead on at 100 yards, a fraction low at 120, and continues to drop from there.
It. Does. Not. Cross the Line Of Sight twice. This flat spot is why 100 yards is a good distance to zero.
The flat spot with a 22LR is at 50 yards, which makes that a good distance to zero a .22LR.
Now if you zero your high-powered rifle at 200 yards, yes- the bullet crosses the LOS around 50 yards, is high at 100, and drops back (intersects) the LOS at 200.
But not with 100 yard zero.
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LOL! IIIRC, some of Kirby"s creations were zeroed at 600 yards.
Lots of us zero at 100 and dial or hold from there. Most professional shooters/ gunmen do.
A 600 yard zero changes with the weather. 100 yard zero doesn't. But different strokes.
lancetkenyon
Well-Known Member
Yes!
No dispute that bullet crosses line of sight twice assuming you have sighted it in to do it at least once. The distance at which it does this is entirely dependent on ballistics and how YOU sight it in.
Interesting! I put 20moa mounts on pretty much all of my rifles I intend to shoot over 600 yards. Sounds like another very good reason to do so.
I generally don't zero anything at 100 yards even on rifles I zero for others unless they tell me specifically to do so. I'll generally zero somewhere from 200-250 to give a bit more point blank range.
I zero all my LR rifles at 200Y. Yes, Bruce knows his stuff. IIRC, he has a PhD in Optical Engineering. He spent many years in aerospace and defense business before retiring from Teledyne Technologies. He owns High Power Optics in Ventura, CA, but since moved elsewhere but I am not sure where.
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Varmint Hunter
Well-Known Member
The only rifle I zero at 100 yds is my 45-70 with 550gr crater bullets. I use a 20moa base to get me out to 300 yds. 
