Equipment versus practice posts and Rifle practice/shooting

[Pizzlegreet]

I’m not trolling. I’m new to all this. I appreciate the feedback. Based on the above links and charts and my own thinking about this I think I am in the “rifle being canted, reticle being vertical,” section.

That said, with my rifle canted and the reticle vertical I took a ruler and measured the the offset between the center of my barrel’s bore and the center of the reticle, and the scope is left 0.5” horizontally and up 2” vertically. My calculator says the angle is 14 degrees, not 30 as I said in the original post.

So what about this as a hypothesis: Assuming no wind and no spin drift, as long I keep the plane that the bullet travels in parallel to the plane that the scope (created by rotating the elevation turret) moves through (0.5” apart based on my measurement), I should be able to dial elevation and the point of impact will always be 0.5” right of the point of aim, no matter the distance.

To do this I need to zero at 100 yards with the POI 0.5” right of the POA. Then it’s all good no matter the distance. And I can then add back in windage and spin drift and use a ballistics app (and turret dialing) as usual.

Is my logic correct?

 

[Pizzlegreet]

To Carls point, it may be that my rifle does not fit me well. This all may be a pointless intellectual exercise when instead I should be visiting someone to help me fit the rifle better.

 

[The Guide]

To Carls point, it may be that my rifle does not fit me well. This all may be a pointless intellectual exercise when instead I should be visiting someone to help me fit the rifle better.

This is the answer, good sir. Sometimes it isn't the fit that is incorrect but the way you mount the rifle. You might be strangling the stock with your thumb and palm while trying to hold the rifle into your shoulder making it uncomfortable to hold. You might not have the right scope hight over bore to align best with your eye and face structure (high/low cheek bones). You might just need someone to photograph you when you mount the rifle in order to see how you are holding it and what might need to be adjusted. Heck, your length of pull might be wrong for that stock or your scope isn't back/forward enough for the eye box to be in the proper natural position for your face. There is a lot more to a properly fitted rifle than one might think.

Jay

 

[ckt3]

I’m not trolling. I’m new to all this. I appreciate the feedback. Based on the above links and charts and my own thinking about this I think I am in the “rifle being canted, reticle being vertical,” section.

That said, with my rifle canted and the reticle vertical I took a ruler and measured the the offset between the center of my barrel’s bore and the center of the reticle, and the scope is left 0.5” horizontally and up 2” vertically. My calculator says the angle is 14 degrees, not 30 as I said in the original post.

So what about this as a hypothesis: Assuming no wind and no spin drift, as long I keep the plane that the bullet travels in parallel to the plane that the scope (created by rotating the elevation turret) moves through (0.5” apart based on my measurement), I should be able to dial elevation and the point of impact will always be 0.5” right of the point of aim, no matter the distance.

To do this I need to zero at 100 yards with the POI 0.5” right of the POA. Then it’s all good no matter the distance. And I can then add back in windage and spin drift and use a ballistics app (and turret dialing) as usual.

Is my logic correct?

I think that the better fix is setting up your rifle and practicing so you don't need to cant it. But the intellectual exercise of setting up a parallel zero given the scenario you outlined should hold, and in theory your POI would always be 0.5" off assuming you can repeat the same cant.

 

[wind gypsy]

So…

I’ll assume we’re talking about the second example, “Effect of the rifle being canted and the reticle being vertical”.

The “added windage due to offset (constant)” is, in my opinion, confusingly worded. Not that I’m above that myself. The angle is indeed fixed, however because it is zeroed at 100 yds that means the angular windage correction to get back to zero will vary with the range you are shooting.

For example, let’s look at the 10 degree cant column. At 200 yards it calls for .347” of windage correction, at 400 yards it calls for 1.042”. If the 400 correction was double the 200 correction, that would represent a fixed angle which would be easy to account for.


In practical terms if the offset is small there’s nothing to worry about, but when it’s extreme it’ll cause issues. I personally eyeball my reticle vertical to my rifle (as a degree or two offset is in the noise), then set my bubble level carefully to my reticle. You have to get most deeply in the weeds when a match director makes you shoot a precision rifle “gangster style” at mixed ranges and you want to figure the correct windage and elevation offsets for each range.

That makes sense, i noticed the increments not being linear as well and couldn't make sense of it. Thinking of a bullet trajectory and scope POA vector, with that offset you'd need to adjust windage to have POA/POI aligned at different distances so it cant be a constant.