What is a typical BC for your 22 data?

[tlsmith22]

I was just curious what everyone was running for their BC. I had mine at like .140 out to 300 yards and we trued it to shoot at the match at 200 today and ended up running it at like .160. Just curious what everyone has for a BC, I am running Center X, Midas and Eley Match.

 

[Cowpokey]

Vudoo 20" MTU, SK Pistol Match, .157

 

[AllenOne1]

.172 for Norma TAC

 

[Cowpokey]

.172 for Norma TAC

What are you running it in?

 

[nikonNUT]

Vudoo 20" MTU, SK Pistol Match, .157

Same set-up but with Center-X. Trued my MV at 200 using Kestrels G1 of .121. Seemed good out to 350 yards at the match today but a little BC truing won’t hurt.

 

[Cowpokey]

I bought a couple bricks of Norma TAC-22, it's good ammo, but haven't put any though my Vudoo, or put any across the Magneto Speed V3.

 

[lash]

BC will vary depending upon which ammo you are using. Despite the appearance being similar between .22 LR rounds of different brands, there can be considerable differences in their respective BCs.

I don’t think that my charts included the brands you’re using, but this thread does discuss some of the ballistics:

Some 22 LR Trajectory Charts

In preparation for our first local long range precision .22 LR match this month, I found that many of the first time shooters had/have no idea what their dope is or should be. After looking for easy ways to provide them information, especially those that do not have ballistic apps or are new...

www.snipershide.com

 

[Cowpokey]

Same set-up but with Center-X. Tried my MV at 200 using Kestrels G1 of .121. Rounds flew pretty true out to 350 yards.

I ran a bunch of SKPM over the Magneto Speed V3 out of my Vudoo, and trued up the Kestrel 5700 Elite to match POI at various distances out to 100 yards, I'm limited by what the local range distance is. I've shot farther without doing any other calibrations, and the Kestrel is dead nuts on farther out. It will be interesting if that holds true when I finally get out farther though, beyond 150...out to 350 or more...time will tell.

 

[ma smith]

SK runs with G1 of .135 out to 300m from a Tikka pretty reliably.

 

[AllenOne1]

What are you running it in?

CZ 455 with a factory barrel, I think it is 20" length.

 

[Milo 2.5]

At 4700 ft, I run a .130 BC, Center X, with an exaggerated MV, 1125 fps, another with Center X is .127 BC at 1090fps, both are dang close to 300 yards. Pretty tough to get a non-windy day to actually true things up to perfection.

 

[LeShagal]

Get your notebooks out kids....(McCoy 1990)
Here's additional Math stuff for Nerds
See also: the Sierra 2014 calculated BC table based on info from the aforementioned links

Build your table by plugging in the first G1 BC, finding the range corresponding to the velocity threshold as defined by the 2014 table, start shifting your BC correspondingly until that segment of the curve matches your recorded dope....rinse repeat.

Use the 3-4 "segments" of your drop tables to compile a Composite Curve based on the 3-4 drop charts (using the applicable segment from each) and I'll bet you'll find curve that more closely parallels your real world results than anything you've produced prior. You may have to fudge a little where the segments join to smooth out the Kinks in your curve but it shouldn't be by much.

Thank me later.