misfires

[halfmoanut]

I own a BAT MB 17 action and it is a 6x47Lapua,I get misfires with cci450mag primers and with rem 7&1/2's but have yet to have a Fed 205 misfire.I am bumping shoulder back 2thou,and I am not bumping the web at all,it is also happening after a few firings on the brass. I took it back to my smith and he checked the spring and said everything he sees is leget just wondering if anyone else is experiencing this problem with this action.

 

[Preacher]

Seems to be "maybe" a spring problem, combine that with the .002 push to seat the case into the chamber from the bump back, and the web may have grown just enough to need a bit more push to seat it, and then combine a possibly few more thousandths less firing pin length, and with all that combined you'll hunt up misfires...
The 205's have softer cups, so I'll only assume they would be easy to light up..........