Isn't the Nova a rotary bolt type action? I could see where it would be possible for the rotary style might could encounter lockup but any and mostly all problems can be avoided by using a good lube such as Eezox or Breakfree CLP. Never had a problem with a pump freezing up and I have had Winchesters with rotary bolts to Rems and Mossies with standard style bolts. If it's that cold out there. I ain't goin'! I have parts of me that'll freeze before the gun does! LOL