What are differences between 6mm arc and 243 lbc?

[leroy55]

I've done a brief look at the 6mm arc and I know the case length to shoulder is slightly shorter.  What are the other major differences?  Are they different enough to prevent the they arc case from being fireformed into a 243lbc? 

[GLSHOOTER]

Jun 3, 2020 13:52:43 GMT -8 leroy55 said:

I've done a brief look at the 6mm arc and I know the case length to shoulder is slightly shorter.  What are the other major differences?  Are they different enough to prevent the they arc case from being fireformed into a 243lbc? 

You could PROBABLY fire form it in a 243 LBC butthe necks wil be short. Trust me Grendel brass will always be more available than the ARC. Plus you can get QUALITY Lapua not the off and on Hornady.

Greg