Data needed for 22LR 16" Ruger 10-22

[JagerDog]

Not correct. BC is dependent on velocity, hence why some bullet manufacturers provide BC's for different velocity ranges, and why ballistic programs allow you to put in multiple BC's for varying velocity ranges.

Oh and there is a "v" in the equation above, it is just in the drag coefficient. http://en.wikipedia.org/wiki/Drag_coefficient

Infinitesimal in the topic at hand (22LR bullets at 22LR velocity).

[the86d]

From the specs:
Remington Yellow Jacket 33 Grain HP @1500 fps
CCI Velocitor @ 1435
CCI Stinger 32 Grain HP 1640 fps
CCI Mini Mag 40 Grain GLRN Bullet 1235 fps
CCI Mini-Mag High Velocity 36 Grain Plated Lead Hollow Point @ 1260 fps
CCI Shotshell 31 Grains of #12 shot 1000 fps

None state barrel length for AVG chrono-ing, but according to the data in the above posts, I would guess 16-ish...

[nubrun]

Infinitesimal in the topic at hand.

I agree, but that was a broad blanket statement you made and was related to centerfires. On a .22 at 1,200 fps not much difference, for a 6.5mm at 3,000 fps it might matter... Besides I am an engineer so I had to correct it.

[JagerDog]

I agree, but that was a broad blanket statement you made and was related to centerfires. On a .22 at 1,200 fps not much difference, for a 6.5mm at 3,000 fps it might matter... Besides I am an engineer so I had to correct it.

Understood. Yes...broader statement than warranted.

Even in 6.5 @ 3K though it's gonna take a long ways before it shows up in results. Typically not more than a 100th or two after 1000 fps loss from muzzle velocity. Interestingly enough, some bullet profile BC's go up and some go down as velocity dwindles.

Here's some data on 22LR specifically (though nothing supersonic):

http://www.exteriorballistics.com/ebexplained/22rimfire.cfm

Anyone care to calc the difference in drop within 22LR effective range?

And here's a bunch of velocity and (static) BC data for 22LR (and other rimfires):

http://www.sniperforums.com/forum/rimfire/34454-22-ballistics-info.html

[nubrun]

Understood. Yes...broader statement than warranted.

Even in 6.5 @ 3K though it's gonna take a long ways before it shows up in results. Typically not more than a few 100th's after 1000 fps loss from muzzle velocity. Interestingly enough, some bullet profile BC's go up and some go down as velocity dwindles.

I agree and the only reason it would even matter would be if you had to be spot on for the first shot. Even at 700+ yards using a single g7 BC gets me on target.

[1lostinspace]

It matters for what I am doing

[JagerDog]

It matters for what I am doing

Out of curiosity, what are you doing?

[1lostinspace]

Out of curiosity, what are you doing?

Can't say much just that I need exact data.

[stilly]

I had heard that the average .22lr would begin to actually slow down after about 18". The powder is all burned and the pressure will begin to drop off and the bullet begins to be slowed by the barrel friction.

so i don't think anyone is getting velocity figures out of a 24 or 26 inch barrel.

I thought IDEAL .22lr barrel length was a 17". You mean I cut all my barrels down for no reason? Damn...

[pagedeveloper]

22LR speed

If you can get a chronograph it will give you an exact speed that you are
shooting. It can be used for all bullet weights. That would be the most accurate way. You might even be able to borrow one from someone..

http://www.midwayusa.com/product/852429/competition-electronics-prochrono-digital-chronograph

[acourvil]

I just checked a few brands. This is not out of a 10/22, it's a 20" AR upper (actual .22LR barrel, not .223). It's not exactly what you are looking for, but here it is:

__________________________Pub Pub Actual
Cartridge_____________Weight BC FPS FPS
CCI MiniMags RN________40 0.133 1235 1176
CCI MiniMags HP________36 0.128 1260 1215
Federal GMl Premium_____40 0.138 1080 1071
Wolf Match Extra_______ 40 0.130 1050 1033
Eley Match OSP________ 40 0.149 1030 1041
Federal Value Pack______36 0.131 1260 1248

And, FWIW, the match ammo definitely grouped better than the others at 100 yards, and the SD for FPS was about half of the SD for the others. The BCs were what I found listed in ads, etc., they were not calculated.

[Jack1939]

Nikon spot on has bc and velocity info for most brands of 22lr

where it says "step 1: select a scope" choose the prostaff rimfire

http://spoton.nikonsportoptics.com/spoton/

[acourvil]

Great link, that's the most complete source I've seen for .22 data. The only gap I see is that they don't list anything for Lapua/SK/Wolf.