If you really want more power than the 300win mag or 338win mag skip the weatherby cartridges and go to the ultramags.They provide more power without having to buy an overpriced weatherby rifle or their factory loads or brass.As the former owner of a 300weatherby fibremark and present owner of two 300 ultramags I much prefer the ultramags for performance and accuracy.I still feel however that the average hunter(non handloader) would be best served by the 300 win mag or 338 win mag due to their reduced recoil,variety of loads and reduced cost.