I have a tikka t-3 lite in 300 wsm. I had originally wanted to built a custom gun off a predator or 700 action but cant now $$$. So I will be building up my tikka in steps now. Options for caliber are 7mm/300 wsm, 7mm wsm or 7mm SAUM. Will the bolt face of the 300 wsm work for the 7mm saum? If not than the choice is easy. I was looking at the 7mm/300 wsm over a standard 7mm wsm because of the availabilty of brass, I can use norma brass with less case prep and norma now offers brass for the 300 saum so the same case prep steps. I am leaning toward the 7mm SAUM provided the bolt face will work from my 300wsm. I will be rebarreling with a shilen barrel and replacing the factory reciol "bar" with a remington style recoil lug. Final step dropping it into a manners stock. Any input would be appreciated as to 7mm/300 wsm, vs 7mm wsm vs 7mm saum. Thank you.