Swamplord,
Is your brother happy he rechambered his to 30 378? Or would he rather have gone with something else?
I'm trying to decide what to do with mine now..
We only had a month before moose hunting season in 2012, a bit of research and I found that only two cartridges would clean up the Warbird chamber without setting the barrel back, my smith informed me that he wasn't able to do the metric threading the Sako came in , That eliminated the 300 Lapua and any Improved variants as they would require setting the barrel back before rechambering
the two choices we had for simple rechamber , confirm headspace and go were the 30-378 WBY and the 300 Pegasus,
my smith had the 30-378 Wby reamer in his shop so
the obvious choice was the WBY + due to availability of brass and ammo , my brother does not reload and I do all the reloading for him but was unable to because of work out of town, he bought a couple boxes of Weatherby factory ammo with the 180 gr Accubond, 3 shot groups provided the famous WBY 1.5" at 100 yards guarantee and he was set for moose hunting ( factory ammo was not chronographed)
He ended up taking a nice 61 1/4" spread bull moose I called in to 120 yards and intends to keep the WBY chamber
Now if you completely rebarrel the Sako M995 you have a lot of options, any caliber on the 338 Norma, 338 Lapua case or the 378 Wby case , 338 Excalibur and 300 Pegasus ...
You also have 4 new options ! my 4 wildcats based on papa Jeffery,
hey y'know , the 300 Werewolf will easily clean up a Warbird chamber and the Jamison brass is pretty darn good stuff these days , can you imagine a 230 gr Berger at 3500 fps ???