Heavy, I have shot thumb holes before, not mine, over the years and it is very easy on the recoil. My 7mm is so light on the recoil, more of a "push" than a smack. I have a Saiga in .308
with a recoil brake and the S.308 smacks harder than my 7mm. I have only shot 140 gran factory loads so far, waiting to see how a heaver load works and its recoil.
As far as a shooter, all I can do is hope, but I feel it will be a good one.