Custom Loaded Ammunition

[MyOdessa]

6TCU is actually more like a 6x45 ackley improved.
The whole TCU series have sharper shoulders and larger case diameters at the shoulder.

6x45/6x223:



6TCU:

Unless my eyes deceiving me, you are comparing 6x45 to 6.5mm TCU dimensions.
I shoot 6.5mm TCU and 6.5 JDJ in T/C Contender, great cartridges, easy to work with.

[ar15barrels]

Unless my eyes deceiving me, you are comparing 6x45 to 6.5mm TCU dimensions.

I simply grabbed a TCU cartridge diagram to show the shoulder angle and case body diameter at the shoulder.
They are the same across the family.