An unintentional physics lesson at 100 yards with a highly mechanical device

[Flintsack]

I grabbed my R1 Laser .20 To shoot it at 100 yards for groups. I shot it at 50 yards first. It shot a quarter size group. I stopped after four shots, And moved on to 100 yards. I turned 40 clicks on the scope.

I shot probably 20 shots at 100 yds trying to figure out where it was hitting. I could not hit the 2’ x 3’ piece of new paper. This makes no sense, as I figured it should drop about a foot or so. The wind was blowing really hard left to right. 

So I went back and put out two other new sheets of paper. To cover any amount of drop...I thought. Below are the results. Plus the final five shot group. Winds are blowing left to right 10+ miles an hour.

This result caused all kinds of questions in my mind. I’m not going to throw them all out right now. But I found the end result extremely interesting.

I Started out shooting sighters by holding on the very upper left-hand corner of the new sheet of cardboard, top sheet. Once I had it On paper (3 feet low). I lowered my point of aim, which I marked with a star. So my point of aim moved down about 4 inches, and right about 4 inches (see pic).

I would love to hear your thoughts on the result.

Mike

all of the pictures are side ways...

 

[Thebryan]

Intrested in what your muzzle velocity amd pellet/ slug you are using? Also scope mil or moa?

 

[Centercut]

Interesting when the winds are strong, but steady... We don't get that very often in SoCal. That group would be even very good in breezy or no wind conditions for a .20 cal Springer. I only ask because side winds of 15 mph (?) results in about a 2 foot wind drift, and any variance in wind speed of even 5 mph will cause a differential of about a foot...

 

[Flintsack]

CC. Winds were definitely above 10 mph.

 

[Flintsack]

Thebryan 

I have to think it’s shooting way under spec. My chronograph has been shot too many times... By some idiot...

That’s one of the things I found so funny, was how much it dropped. The fact that it was still accurate, really blew me away. I was just shooting 20 caliber Crossman’s.

mike

 

[DesertSilver]

Did the idiot manage to kill the chrono?

 

[steve123]

Looks like the scope wasn't tracking, like you dialed but the reticle didn't respond. Or maybe you dialed down, lol??? - Not like I've done that before or anything

 

[Chuck-in-Ohio]

My Steyr 110 in .20 is set at 750 FPS with the JSB 15.89 pellets to generate just under 20 Ft. Lbs. and my dope chart says 23.5 inches low at 100.

Depending on where your R1 is running at velocity wise, or what it is supposed to be running at, the drop you saw might not be too far off spec?



A head wind would drive your POI down, as well as a full value left to right wind. A left to right wind would drive your POI down and to the right, so that may be a possible explanation.