NigelM Posted February 18, 2017 Report Share Posted February 18, 2017 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 More sharing options...
Elwood Posted February 18, 2017 Report Share Posted February 18, 2017 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 More sharing options...
gunner Posted February 18, 2017 Report Share Posted February 18, 2017 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 More sharing options...
NigelM Posted February 19, 2017 Author Report Share Posted February 19, 2017 Thanks for the help guys. Is anyone running a 9 twist and found issues with 40 grainers blowing up with the excessive twist rate. Are there any downsides to twisting "too fast" over 300 meters? Link to comment Share on other sites More sharing options...
bully Posted February 25, 2017 Report Share Posted February 25, 2017 Maybe send the likes of hornady an email. There a friendly bunch, and have given me limits for projectiles in a 8 twist. Link to comment Share on other sites More sharing options...
bradders Posted February 25, 2017 Report Share Posted February 25, 2017 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 More sharing options...
Big Al Posted February 25, 2017 Report Share Posted February 25, 2017 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 More sharing options...
baldie Posted February 26, 2017 Report Share Posted February 26, 2017 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 More sharing options...
Vermincinerator Posted February 26, 2017 Report Share Posted February 26, 2017 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 More sharing options...
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