thanks, firstly for not trying to be a smart arseFor the sake of a few quid I’d just buy a replacement extractor kit & get it fitted by someone who knows how so they can assess whether there’s any other damage that’s not otherwise immediately identifiable. It’s possible the extractor claw could look fine but may be slightly bent or have a stress crack that’ll lead to failure at a later date - as @Klenchblaize says, cold weather can affect the mechanical properties of the metal, not usually a problem under normal conditions but you’ve over stressed this part.
I managed to seat a primer in back to front like you once when I was bulk loading 222 on a progressive press so wasn't doing a visual check at each stage, but luckily it didn’t go off as it was seated deep enough for the pin not to strike the anvil.
If I was you I’d check the rest of the ammo you’ve loaded to make sure the primers are all fully seated.
Spare Bolt Extractor / Ejector Service Kit for Tikka T3x/ T3 and Sako A7 - Bagnall and Kirkwood Airgun Spares
Genuine Sako/Tikka factory spare part kit Suitable for Tikka T3,T3X and Sako A7 Extractor Extractor Plunger Extractor Spring Ejector Ejector Spring Spring Pin Suitable for all calibers