Welcome to the forum Jbremount. There are numerous threads on fire forming 7.62x39 brass to 6.5 Grendel. There is a google custom search feature that is very helpful in finding information on this forum. Id say the reason your desk top will not log into this forum is because of parental control or other restricted content selection in your internet preferences. Guns are considered worse than anything else right now by a segment of society.
Here is a link to the google custom search.
https://cse.google.com/cse?cx=0163689474...cu1o&hl=en
Here is a link to the google custom search.
https://cse.google.com/cse?cx=0163689474...cu1o&hl=en