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12 Twist 22-250/69g SMK h/t Michael Courtney

 
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  #1  
Old 05-31-2014, 12:52 AM
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12 Twist 22-250/69g SMK h/t Michael Courtney

Thanks to information posted by Michael Courtney, I decided to try 69g SMK's in my 12 twist 22-250. Hodgdon load data showed 3499 fps mv from a 24" barrel using Superformance with a 70g bullet, so I used that data for my workup. I chose the 40.2g load, which produced a .445" group @ 100 yards and averaged 3579 fps from a 26" barrel. I can't wait to stretch the range with this load and see what it can do!

I have also prepared some test loads with RL-17, but didn't have time to shoot them.

Attached are images of my load workup and my rifle.

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000349.jpg

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000345.jpg

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000346.jpg

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000347.jpg

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000348.jpg

12 Twist 22-250/69g SMK h/t Michael Courtney-p1000365.jpg
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Old 05-31-2014, 08:20 AM
dig dig is offline
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

Great info, looks like at that velocity you are having no problems stabilizing. This should be a fun load. I shoot the 69 in a 1/10 26 inch .223 with good results on a hot load. Keep us posted.
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Old 05-31-2014, 11:42 AM
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

Quote:
Originally Posted by dig View Post
Great info, looks like at that velocity you are having no problems stabilizing. This should be a fun load. I shoot the 69 in a 1/10 26 inch .223 with good results on a hot load. Keep us posted.
Will gladly continue to post results as I have them.

According to the information and spreadsheet/calculator posted by Mr. Courtney, a 12 twist is sufficient to stabilize the 69 SMK, even at lower velocities, but that same information also shows that a lower level of stability can reduce bc. When I shoot this load at longer range, I hope to determine whether or not it is stable enough to get the full bc value.

Michael Courtney's research was a real eye opener and an interesting read.
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Old 06-01-2014, 11:16 AM
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

I missed it,,
How does that same information show that a lower level of stability can reduce bc?
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Old 06-01-2014, 02:25 PM
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

Here is the research Mr. Courtney posted. It specifically states that a stability factor below 1.2 results in lower observed bc's:

STABILITY.pdf


That research, along with the stability calculator Mr. Courtney provided, is what convinced me to try the 69g SMK's to begin with.

Here is the link where Mr. Courtney posted the information, post #27:

22-250 to 600 yards max, does anyone do it?
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Old 06-01-2014, 10:37 PM
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

What make of rifle is that ?
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Old 06-01-2014, 10:49 PM
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Re: 12 Twist 22-250/69g SMK h/t Michael Courtney

It's a BRNO 98/22 mauser that has been sporterized with a Bell & Carlson Medalist stock and a Shilen pre-fit 26", #4 Contour, 12 twist chrome moly barrel.
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