What caused this?

[Chuckwagonsam]

Shot my new 45/70 Sharps (Chappa?) and when I resized the shell, some, most, dimpled like this. Starline brass.

 

[Hawg]

Too much case lube. It doesn't take much. They'll be ok to reload, the dents will come out when they're fired.

 

[Smokin_Gun]

What Hawg Haggen said seen it happen afore...
+1

 

[rattletrap1970]

Definitely too much lube. It gets pushed down the casing until it's in a larger droplet and because a fluid doesn't compress it actually dents the case. Notice how the shape of the dents resembles an elongated bubble or droplet?

 

[Chuckwagonsam]

I did just lube up the pad. Thanks.