Remington. 17hmr

[DS Mad]

That's the one. I have seen them less obvious also!

They were the Winchester HV

 

[Smellydog]

They were the Winchester HV

It is an inherent issue with any brand of HMR.

I believe the only way around the problem is to change the brass by adding more copper and or adding another element like lead.
Oops I said lead. Sorry