300 RUM with new high BC 200gr SMK

[Justin Todd]

So I bought a box of these to try out and I got some start and max data from Sierra for the powders I have. Has anybody else tried these in 300RUM yet?

 

[Calvin45]

So I bought a box of these to try out and I got some start and max data from Sierra for the powders I have. Has anybody else tried these in 300RUM yet?

Nope but I am intrigued about them in my .300 win, might give them a try yet. They recommend a 1:9 twist but I actually emailed Sierra a while back and confirmed that my 1:10 twist would be fine at 300 win mag velocity and at any elevation above sea level - the 1:9 recommendation was apparently for ensures stability at .308 win velocities at sea level, making sure.

 

[Mram10us]

So I bought a box of these to try out and I got some start and max data from Sierra for the powders I have. Has anybody else tried these in 300RUM yet?

It is a disservice to put anything lighter than a 210 thru a rum now the 245 has my interest