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Author Topic: .22LR Ballistic Coefficient  (Read 1159 times)

Offline J Mack

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.22LR Ballistic Coefficient
« on: June 28, 2011, 06:54:17 AM »
I'm switching from a MOA/MILL to a MILL/MILL scope on my .22 and converting the info in my shooter app and need to confirm the BC number I have for SK standard plus or Wolf match ammo.
The APP is telling me 2.5@100 and actual is closer to 1.7@100

Can any of you .22 shooters confirm a Ballistic Coefficient: 0.114 G1?
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Offline Shade OGrey

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Re: .22LR Ballistic Coefficient
« Reply #1 on: June 28, 2011, 11:10:05 AM »
There is a list of rimfire BCs here http://www.rimfirecentral.com/forums/showthread.php?t=57007.
Best I could find so far.
It may be helpful for some, not so much immediate use for others, because it does not give the bc for the Wolf as you requested, but still a useful reference resource.
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Offline Shade OGrey

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Re: .22LR Ballistic Coefficient
« Reply #2 on: June 28, 2011, 11:22:25 AM »
.22LR 40gr Wolf Match 1050fps = 0.130 G1 (http://www.6mmbr.com/rimfiretactical.html about half way down).
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #3 on: June 28, 2011, 12:17:39 PM »
Quote from: Shade OGrey on June 28, 2011, 11:22:25 AM
.22LR 40gr Wolf Match 1050fps = 0.130 G1 (http://www.6mmbr.com/rimfiretactical.html about half way down).

Thank you Shade OGrey!
I’ve seen guys claim .0130 G1 to .159 G1 and pulled .114 G1 from a site that I forgot to bookmark, but I can't seem to get these numbers to jive with my setup.
I'm hoping someone local has confirmed some numbers out to 250 yards to save my lazy butt some work.
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Offline ida83704

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Re: .22LR Ballistic Coefficient
« Reply #4 on: June 28, 2011, 12:31:19 PM »
From my experiance the G1 BC for .22rimfire runs between .105 to .135 depending on the manufacture
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #5 on: June 28, 2011, 12:36:43 PM »
Quote from: ida83704 on June 28, 2011, 12:31:19 PM
From my experiance the G1 BC for .22rimfire runs between .105 to .135 depending on the manufacture
Can you confirm the BC number for SK standard plus or Wolf match ammo?
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Offline ida83704

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Re: .22LR Ballistic Coefficient
« Reply #6 on: June 28, 2011, 12:45:42 PM »
I can't, but Fastfire is running Wolf.
I'm sure he'll post what he is using when he sees this.

Also run it over a chronny.
None of the rimfire I've chrony'd matches manufactures listed FPS.
Some are faster, some slower MV
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Offline fastfire

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Re: .22LR Ballistic Coefficient
« Reply #7 on: June 29, 2011, 09:13:59 PM »
I have had the most consistant groups using Wolf Match Extra. The groups are a little tighter with Ten-X but rite now that's to pricey for me. I do not have a clue about the Ballistic Coefficient just know it shoots the best in my rifle.
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #8 on: June 29, 2011, 09:44:30 PM »
Thank you Fastfire I guess I'm going to have to get out and shoot some of this ammo out to 225 yards and try to get it narrowed down.

I can only shoot out to 100 yards out the back of the shop before the neighbors start acting Goofy. 
This is what I have so far for the SK-Standard Plus.
Average VEL= 1103 FPS
With a 50 Yard zero I get 1.9 mil to 100 Yards and unfortunately all the BC's numbers I have net the same 100 yard drop but have a .6 mill swing from high to low at 225 yards.

Drop from a 50 yard zero to 225 yards.
BC 159 G1 = 8.1 Mills
BC 130 G1 = 8.5 Mills
BC 114 G1 = 8.7 Mills
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Offline ida83704

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Re: .22LR Ballistic Coefficient
« Reply #9 on: June 29, 2011, 10:48:00 PM »
I doubt the actual G1 BC is .159,
I think you will end up between .110 and .130 which would be .2 or .3 Mils diff at 225y.
You will prob have to go out and shoot it out to 200, 250, 300 yards and see what it calc's at.

Also, a 1moa rimfire at 50 and 100 yards is probably a 2moa rifle at 200yards and a 3moa rifle at 300yards.
Long range rimfire, think 'cone of fire' not necessarily precision out past 125-150 yards.

Those tiny bullets have to work real hard, add in MV varriations and diffrent dents in the lead bullet from the feed ramp and groups will open up the farther out you go.
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #10 on: July 01, 2011, 09:03:47 AM »
Some friend’s came over to do some shooting and we got a chance to shoot our .22’s out to 235 yards and found that our SK Standard Plus ammo shot like it has a lot higher BC number than what’s commonly believed. I have read on the nets other guys claiming .159 G1-BC numbers for this ammo as I mentioned above but discounted it and assumed the .114 to .130 would be my actual number.
     
 +8.6 MILL’s to 235 yards from a 50 yard zero with AVG,VEL of 1103 FPS gives me a G1-BC of .160

Disclaimer:
We were testing some barrels for a project I’m working on as was I trying out a new scope so we had a lot stuff going on and did not spend too much time trying to confirm these numbers.
Scope is the new SWFA 5-20X50 HDFFP and I have not spent the time to box test mine but others have and I believe turret adjustments to be accurate.
The barrels are a tensioned barrel and shoot the SK ammo very well and put ten shots at 235Y in about a three finger group or 1.5” to 2”, and again good enough to make me believe the above numbers but I cannot confirm with this limited testing.         
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Offline ida83704

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Re: .22LR Ballistic Coefficient
« Reply #11 on: July 01, 2011, 10:57:40 AM »
Interesting.
That is probably one of the higher BC's for .22 rimfire.
Who sells SK in town?

FYI
Here are some of my results

CCI Standard Velocity
MV avg. 1080fps
BC .113
Tested to 250 yards

Eley Target (Yellow Box)
MV avg. 1050fps
BC .135
Tested to 250 yards
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Offline No-One

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Re: .22LR Ballistic Coefficient
« Reply #12 on: July 01, 2011, 11:21:51 AM »
SK Standard is exactly the same as Wolf Match . Made in the same facility to same specs but put in different boxes . We ordered it online quite a while back .
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #13 on: July 01, 2011, 11:29:11 AM »
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Offline fastfire

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Re: .22LR Ballistic Coefficient
« Reply #14 on: July 01, 2011, 06:01:31 PM »
« Last Edit: July 01, 2011, 06:06:52 PM by fastfire »
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Offline J Mack

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Re: .22LR Ballistic Coefficient
« Reply #15 on: July 01, 2011, 07:27:46 PM »
Quote from: fastfire on July 01, 2011, 06:01:31 PM
This my be a better price if you buy a carton.

http://www.jgsales.com/product_info.php/ammo-for-rimfire/-22/p/22lr-wolf-match-extra%2C-50-round-boxes-/cPath/48_475/products_id/545



J&G sales is about $25.00 more for the case of Wolf Match Extra before shipping.
Champion Shooters drops down to $6.25 a box when you buy 5000.
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Offline fastfire

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Re: .22LR Ballistic Coefficient
« Reply #16 on: July 01, 2011, 09:40:41 PM »
I hadn't even thought about getting 5000 at a time as I use about 4 cartons a year.
Good deal though ;D
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