Bullet Drop Gangsta style

[muddywings]

I want to learn how to shoot gangsta...ok, just kidding. But I would like someone to confirm my understanding of POA/POI as it pertains to rotating a rifle 90 degrees-say shooting under a V-tac wall. I asked this a while back at the range but old age has caused it to slip out of my brain
Example:
AR15, 1x4 scope (lets say MTAC with a BDC), zeroed at 100 yards
rotating the rifle 90 clockwise
Reasoning/thought process:
holding the rifle non-gangsta, the bullet rises till it goes through 100 yards, plains out a bit through 200 then starts it's hard drop due to gravity being a bitch
turning it 90 degrees to the right will cause that 'rise' to cause the bullet to just go to the right
but gravity still being a bitch, will cause the bullet to fall to so now there are two factors at play (assuming Mr. Wind is quiet today)
POA/POI:
By my crude logic, if I'm going to hit a target at 100 yards, I need to hold upper left. yes? no?
Left because the bullet is being sent to the right and upper part of the target because the rise of the flight path has been taken out due to the rotation.

Where am I wrong?

I thought this would be a good place to ask this question. Happy Monday!

[SideShow Bob]

Use Kentucky windage, or in this case, Kentucky elevation...........

[Hoser]

Whatever direction your mag is pointing is the direction you hold off.

VTAC Standards this month in Pueblo.

[TFOGGER]

Hold yer goddam rifle like a grownup![ROFL1]

But yes, the recoil will probably move the POI to the right (up if the rifle were held normally), and you may need to hold further over the target than usual due to the absence of muzzle rise under recoil, since that movement is now being directed to the right(mostly by the shape of the stock).

[muddywings]

Whatever direction your mag is pointing is the direction you hold off.

VTAC Standards this month in Pueblo.

Ahhhh...that's right.
I'm very close to reloading for the rifle. Once I'm cranking out bullets, I'm there!

[C Ward]

Recoil has nothing to do with the holds for a canted rifle , it's all geometry from the angles of where line of sight and bullet path cross and the way they change when the sight is not at 12 o'clock any more .

[TFOGGER]

Recoil has nothing to do with the holds for a canted rifle , it's all geometry from the angles of where line of sight and bullet path cross and the way they change when the sight is not at 12 o'clock any more .

That seems counter intuitive, as gravity is a constant, regardless of sight orientation. I'm also having a hard time wrapping my head around the effects of parallax when the scope is not in vertical alignment with the bore axis.

[Great-Kazoo]

That seems counter intuitive, as gravity is a constant, regardless of sight orientation. I'm also having a hard time wrapping my head around the effects of parallax when the scope is not in vertical alignment with the bore axis.

Loosen the mounts and rotate the scope



















[Sarcasm2]

[Jamnanc]

60424
The gravity will pull downwards, so your shot will go low and get lower the farther you shoot and never high assuming the scope is aligned with the bore. If you rotated your rifle left, or counter clockwise, the bullet would strike to the right inside of your zero distance and to the left or towards the top of the scope more and more the farther away the target is.

Eta: Just wear really heavy shoes so you can lean over farther and hold your rifle vertically.

[C Ward]

It's all about line of site and the angle of the sight on the rifle . We'll use a 200 yard zero for example . With the sight at 12 o'clock the bullet is below line of sight till approx 25 yards , from there it is above line of sight till it cross's below zero again at 200 .

The bullet never climbs once it leaves the bore and gravity starts working on it instantly . What gives the appearance of the bullet climbing is the angle between the sight and bore giving an upward launch angle from the bore . It is physically impossible for a bullet to climb above its original launch angle because of gravity .

Now take the rifle and roll it so the sight is at 9 o'clock . Now the angle from zeroing the rifle is no longer there and the bullet is always lower than the bore , that is why you hold high to compensate for the normal drop . The angle of the scope to bore in this case is pointing the bore to what is now the left and there is no affect from gravity to counter this so this is why you hold right , roll to 3 o'clock and you hold high left , always hold high and toward the mag well .