Don't know about the so called newer and tougher Sierra bullets but most bullet failures as folks call them with Sierras are caused by pushing them to fast for what the were designed for. Typically happening at magnum type chamberings. I have killed a lot of deer and elk with1 65-180 gr GK's in 6.5, .06, and .308 but usually in the 2700 fps + or- realm. They probably will suffice once some distance cuts that velocity down a bit.
I think Muledeer advocates 200gr partitions for the 300mag
Last edited by saddlesore; 10/29/19.
