Not the "7-300PRC" or 300PRC necked to 7mm.
It is an XM or LA cartridge, but not a full length LA...if that makes sense? An XXM cartridge?
A specced 180 @ 2950 is not beating the 7RM at anything except MAYBE in anemic factory loads? My 7RM pushes a 180 @ 2996 w. H1000 or a 184 @ 3050 w. RL26. Heck, a 7SAUM or .280AI can push a 180 @ 2900+. My 24" 7SS can push a 184 @ 2912.
Then there is the 7 Max, 7Mega, 7WSM, 7LRM, 7 Blaser Mag, Lazzeroni Firebird and Tomahawk, 7Wby, 28 Nosler, 7 RUM....
I think once handloaders get ahold of this, the performance numbers will increase, and I applaud innovation and new cartridge designs, but this mid-sized case doesn't make me all tingly. As popular as the 28 Nosler is, they would have been better off (in my opinion) of going a bit longer to a true LA case and keeping velocities in the 3050 range. Too many handloaders will match the 7PRC specs with what they already have.