55 e tip twist rate

[mrandrew]

does anyone know what twist rate I need to sling a 55 grain e tip? 1-14, 1-12

 

[CMBTshooter]

A 1-9 should do really well.

 

[FOTIS]

It will not do for my 1:14 twist in my 220 swift.

now input data in here

http://www.bergerbullets.com/twist-rate-calculator/

 

[FOTIS]

1:10 marginal stability at 3300 fps.
1:9 better
1:8 bingo! so ok for my Ruger american