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.308 in a .270

Crazy some of these photos!

I was out doing some drop chart testing out to 1K about 10 years back with a 7 Rem Mag and a 7 STW. Had both shells on the bench. Switching rifles to let them cool. Well I ended up putting a 7 mag in the 7 stw. Needless to say it sounded a bit funny after the shot. I extracted the case and couldn't believe what a dumb mistake that was. Nothing was hurt, but it was definitely a big reminder that $hit can happen if you're not paying attention. I now only keep 1 rifle and ammo on the bench.
 
Borescope pics:
First two are in the barrel. Aside from some copper, nothing untoward as far as I can see.
IPC_2025-10-21.08.20.34.5810.jpgIPC_2025-10-21.08.23.01.1030.jpg
 
These 3 are all in the chamber area. It was literally coated with brass, small brass chunks, etc., except for one area, which was clean.
IPC_2025-10-21.08.19.00.0550.jpgIPC_2025-10-21.08.19.33.7850.jpgIPC_2025-10-21.08.22.17.9280.jpg
I'm not sure what else to show/do.............
 
Came way too close to seeing something like that up close and personal. I was working with someone at an event, where the only centerfire guns the person had was a Win 70 featherweight in .270, and a Savage 99 in .308 Win. Had to swap guns fairly often, to let one cool down after a few shots. After a close call of *almost* chambering a .308 in the .270, we implemented a new rule: when the gun leaves the bench, the ammo for it goes with it!
I did that once. Was on the department range on my day off working up reloads in two rifles, a M700 Ti .308 and a Model 7 in 7-08. I was doing fine firing a group and then changing rifle and ammo while that gun cooled until a coworker showed up to check things out. We chatted a bit and when he left I went back to business and promptly grabbed a 7-08 cartridge and fired it in the .308 rifle. Low report, low recoil, and before looking at the exceptional low reading on the chronograph I knew exactly what I did. Both MTM boxes were the same color and I managed to change rifles but not the ammo while I was distracted with company. 50/50 chance that I didn’t get a .308 attempted in the 7-08 that obviously would have caught my attention and not been chambered. As far as aww shits…..I got off easy, I lost a case out of the batch.
 
To correct a previous post, the owner did have to use some oil and a bit of tapping of the bolt to remove the fired case.
 

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