Muzzle angle affects trajectory?!?!

[stuporman]

I know you are not supposed to shoot a rifle in the air and all, but.....
(nobody around me for 3 miles, if I do hit somebody, they r not supposed to be there!)

I noticed that when shooting at a steep angle off a tree for a brace, bullet drop was different than if shooting flat.

Makes sense, just never thought of it before.

Ill try to math it out and get back to yaull how it affects bullet drop and trajectory curve.

Unless, somebody already has that worked out?
I was just getting used to flat shots!

 :shock:

[BruceP]

Yep. Although it is dealing with smaller differences in angle that is why the hight of your sights over the center of the bore has an effect on trajectory. Example: When sighting a gun using the first intersection of bullet path and line of sight (say 20yds) a rifle with a scope in high mounts will seem to shoot flatter than the same gun but with low mounts, when really it just sends the bullet on a path with a higher mid-point trajectory. We tend to think it is flatter with high mounts because the second intersection of the bullet and the line of sight will be farther away than it would be with low mounts.
BruceP

[stuporman]

I just did the math on the trajectory for my test round with an angle on the muzzle.

It seems trajectory is affected inversely less the greater the muzzle angle, and fps is proportionally affected more.

I guess that makes sense, as I said before, I just never figured it out on paper.

I know, I will make a table and a graph!   Wooo Hoooo!

Look for it in a few minutes...
Ill do 40 deg or so vs flat trajectories.

more bits
 :shock:

[stuporman]

Look at this wierdness...

It shoots 1/2 inch high at the 20 yard sight in, and progressively gets higher to 30 yds or so.

No wonder I been missing them squirrelies!

http://www.itsabouttime-la.com/CB_Cap_deg.htm

[jh45gun]

I have always heard that shooting up and down hill changes your trajectory or at least that was the old school thought as I have read lately that the flatter shooting hunting rifles you do not have to make that much of a adjustment to hit what you are shooting at when shooting angles but then that just could be what that particular gun scribe thinks so who knows? It would be interesting to see if a faster 22 bullet would do better than that slow cb cap and how much difference velocity makes if any? also maybe seeing if what that writer wrote was right by maybe using a fast centerfire round for comparison to check  for fast velocity would be interesting.  (as long as you brought it up :-D )Jim

[stuporman]

I can do the 22 mag chart posted earlier, the CCI MAXI +V.

http://www.itsabouttime-la.com/22_Mag_deg.htm

Changes just as much, just further out.  Starts to get major at about 40 yds.

Cant see as how Id be shooting at 40 degrees 50 yards out...maybe tapping tree rats in the Sequoia National Forest, but not around here.

The .17 frikin didnt change at all till 70 yds.  I gotta get me one of those.

 :shock:

[jh45gun]

Well then it had to be that velocity has something to do with the results and I am sure the faster the bullet the less change and since your angles are fairly extreme, average downhill and uphill shots are probably not as affected. Jim