x2 on the 6TCU in a bolt gun. 6x45 easier to form with just 1 pass in the die, load and shoot. 6TCU needs to be fireformed. just 1 extra step.
Twud said:If you like 6mms you'd fall in love with a 6mm BR Rem. My riflesmith built one for himself for a pdog hunt. With his own bullets he shot a .035" group at 100 yards. I stopped by there yesterday and demanded to see the target. I couldn't discern the holes without a 20 power loupe. If it were any other man I'd swear it was only 3 shots.
The best I've been able to get out of mine is .120. It's probably capable of better groups in benchrest shooter's hands.