From what I have gathered reading several boards over the last year, just about anybody can get their .204 Ruger to shoot great with the 32 grain bullet, but most are having trouble getting the 40 grain bullet to group as well. Everyone is using a 1/12 twist barrel. From checking every custom barrel maker, 1/12 is about it except you can get a 1/9 from Lilja and Krieger has about six different twists. I want to build a Tac 20 and use heavier bullets,39 and 40 grains). What is the ideal twist? I'm not sure what the 1 in 9 would be good for,some ultra long range high BC bullet I guess), but I'm thinking a 1 in 11 would shoot 32's and 40's great, but I'm only guessing. Does anybody have any insight into this. Is there a formula to compute it? Does barrel length have any effect? I sure wish there was more out there on the Twenties! P.S. What kind of rings are those on WarrenB's Bat Action in the picture----very sweet!