Only time I have ever had a problem was bring an extremely cold rifle (low teens) into the warm house and leaving it all day. I left the barrel point up and condensation ruined the powder. Gun 1/2 ignited on the CVA Kodiak.

With the speed breech, you should be able to get the sabot out to reuse. The powder may end up in your threads. You may be cleaning the threads anyways to remove the excess powder. Pellets are bit easier in this regard.

People always complain about the cost of wasting a bullet when unloading. We spend how many hundreds on the gun and prctice shooting, does $1.00 more at the end of the hunt matter when confidence is concerned? Set up a target at the end of the shooting lane near your house. If the gun is really cold and you cannot leave it in the garage, take aim and fire (if you have the property). Allows you some mid-season practice.