1-10 twist????? Can you return it?
They have been making Mark V 7mm Weatherby rifles with a 1-10 twist since the beginning of time
In 1970s vintage M70 and a Savage M110 7 RM 1-10 twist the Winchester favored 160 gr and never liked 175 or 140 weights. The Savage shot all weights better than the Winchester and really liked the 175 weights.
I believe nothing beats shooting to really know.
I have a M700 in 300 WSM and the magazine is tight with factory ammo.
