Review of the Sierra manual suggests that the 240 SMK requires a 1 in 9" twist to stablize. A call to the guys at Sierra confirmed this. I figured, what the heck, let me see if a Sendero chambered in 300 RUM with the standard 1 in 10" twist will stablize it. Sure enough, it did.
My groupings with Retumbo measured as follows:
All percentges are from the max load of 86.5 gr.
95 and 97% were sub 1/2 MOA
98% - sub MOA
99% was .627
100% was .647
Not the best in the world, but good numbers I felt for a bone stock Rem 700 Sendero using Nosler brass.
Just wanted to pass this along in case anyone else wanted to shoot the heavier stuff but had questioned their twist rate.
Velocity on the 100% load averaged 2729 and there were no signs of pressure and reasonable case capacity left after seating the bullet .010 off the lands.
My groupings with Retumbo measured as follows:
All percentges are from the max load of 86.5 gr.
95 and 97% were sub 1/2 MOA
98% - sub MOA
99% was .627
100% was .647
Not the best in the world, but good numbers I felt for a bone stock Rem 700 Sendero using Nosler brass.
Just wanted to pass this along in case anyone else wanted to shoot the heavier stuff but had questioned their twist rate.
Velocity on the 100% load averaged 2729 and there were no signs of pressure and reasonable case capacity left after seating the bullet .010 off the lands.