vangulil,
Off the top of my head(the records are downstairs in the vault),I believe the twist is 1 in 12.The rifle is factory and used standard for caliber twist.As I recall I loaded it to about 3200 fps.If you compare the 60 gr.partition bullet to a 55 gr spitzer, I believe the 60gr is shorter( at least no longer).This is because the nosler is simi-spitzer.In my considered, but often ignored, opinion, this bullet was made to work in normal .223 class rifles.I wouldn't be surprised to learn that a .222 (1 in 14 twist)will stabilize it.I'm sure the additional velocity of .220 or 22-250 will stabilize it with their 1 in 14 twist barrels.It's not the weight of the bullets that counts, its the length( the weight, together with form, affects length).Give it a try, all you can lose is the cost of a box or bullets.
Mike

Last edited by Der Ami; 09/15/13 11:41 AM.