I leave my Omega loaded unless it gets really wet. Has always went bang when I pull the trigger.

I leave mine loaded with a spent primer on the BP.
I don't bring it in the Air Conditioned house though.

I leave it loaded just take the primer out and let it be.

I've been shooting JSG for the last 2 years, I leave both the .45 & .50 loaded from Nov till Jan. without any rust, corrosion and they always go bang.

For many years now even with black powder i left them loaded until the end of the season if needed. Cover the end with saran wrap and rubber bands or similar and like others said try to avoid bringing in from cold to hot and will work fine. One idea that sounded good on inlines was to put a spent priver in the hole to seal it. Months later they shoot fine. Keep a dry barrel. Don't oil the inside.