Jump to content

22 BR question on twist rate


NigelM

Recommended Posts

Looking at all the twist rate stability calculators if I want to use a 55 grain BK in a 22 BR I need to go tighter than 12 twist in order to achieve a 1.5 stability factor. My choice with Sassen is 1:11 or 1:9, no 1:10 available and I am keen to use one of their barrels.

 

I'm tempted to go 1:9 which will enable me to run heavier bullets if I want to play in a few 300 matches. Has anyone got experience of this subject and if so what advice would you give me?

Link to comment
Share on other sites

I have a 1-12 twist and it shoots anything from 40 gr to 64 gr projectiles, and I would probably wager that it shoots the 55's and 64 gr projectiles better than the 40's and 50's.

 

By all means play safe and go for a faster twist but don't rule out the right barrel because it's a 1-12.

Link to comment
Share on other sites

I used 63 grainers in a 12 Twist and they shot pretty good , this was in a slower 223 so should be fine in 22br . Nice caliber tho , but id go 8 twist if you wondered ;)

Link to comment
Share on other sites

I used 63 grainers in a 12 Twist and they shot pretty good , this was in a slower 223 so should be fine in 22br . Nice caliber tho , but id go 8 twist if you wondered ;)

 

From what I have learned, a 12 twist will shoot 60+gn bullets if they are flat base.

If they have any sign of a boat tail then you will have no chance.

 

I'd always err on the side of caution and go for a 9 twist, or as soon else said a 1:8, and you'll get much more flexibility

Link to comment
Share on other sites

You make no mention of wanting to shoot the heavy for caliber bullets Nigel, it seems 40-55gr is your main priority? if so then a 12 twist is more than good enough. Dont hang too long on the Berger stability factor, it has proven to be excessive on twist rate. A 12 twist will do everything you need perfectly and Sassen barrels are a good product, Ive had a lot of good results with them.

 

Unless you really have a need to shoot 40's more than you might want to stretch the rifles legs and use 77's I would consider an 8 twist, it will shoot 55s no problem and you wont over spin them, that way you have a rifle that will reach out a long way if needed and still give you the 55gr performance you want. If you go that route just make sure the person cutting the chamber can throat it to a compromise between the 55 & 77 gr bullets, if a standard SAAMI reamer is used the throat will be quite short and the 77s will be seated deeply into the case.

Link to comment
Share on other sites

Go with an 8 twist Nigel. I,ve fitted dozens in this calibre, and they seem to shoot anything. I have an 8 twist on my own .22br and it shoots 40,s up to 77,s.

 

Mine is a std saami reamer and throat, and works with both ends of the weight scale.

Link to comment
Share on other sites

Hi Nigel, my 22BR has a 1:12 twist and i only use 55grn Sierra Blitzkings, its a very accurate rifle, i regularly shoot 5 shot groups in the .200"s at the range and my son has shot groups in the .100"s but i use it for long range varminting furthest kill being a 515yd magpie, on 500yd paper it will print 1.25" 5 shot group.

 

Ian.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy