You're not too far off. Here's an updated photo including the 6 GT in center; from left to right are the 6 Dasher, 6x44mm, 6mm GT, 6x47mm Lapua and 6XC:
View attachment 1146483
I would like to thank you for posting the photo, I can see a slightly sharper 40"(I'm guessing) shoulder moved slightly forward and maybe a little less body taper, or not. Nice looking cartridge. I noticed in your info. that you're from Collegeville,Pa. My son graduated from Ursinus College, spent a lot of time and money there great little town and great school. Thanks again for sharing the photo.
Glad to post some photos. It's often easier to process some decisions by seeing the cartridges. The 6mm GT has a 35° shoulder. I personally do not shoot this cartridge, but I do enjoy collecting them... certainly a lot less expensive than having barrels chambered for all of them.
my price was right........I also have a 6xc and I agree with you.......I shoot and enjoy this rifle in memory of my friend