Yep and the 30TC is a shortened 308 and fire formed.

So, you're saying the 260 Rem and 6.5 CM have identical cases ?

Hornady Reloading Manual, tenth edition
Pg 317 ; "The 6.5 Creedmoor was developed by Hornady Senior Ballistics Scientist, Dave Emary and Dennis DeMille in 2007 and announced in the 2008 Hornady Catalog. Based on the 30 TC, the 6.5 Creedmoor is a shortened and improved design....etc"

No, no. You didn't read what he said. You must first take a 308, turn it into a 30 tc, the proceed to making your 6.5 creedmoor. Obviously the 308 is the parent case. LoL

I always read that the 30tc was developed as a substitute for the 308, not from the 308.

still the shortest route to a 6.5 CM case is forming from a 250 savage, less trimming and you size it to 6.5 and fire form. lets look at the numbers
case length
308 2.015
6.5. 1.920
250. 1.912
you'll hafta trim the 308 back .095", the savage is .008 short, but as the body taper is blown out fire forming the case will get longer, if it doesn't make full length, they will not be short enough to make any difference.
neck shoulder junction from casehead
308. 1.7118
6.5 1.635
250. 1.6377.

so size a 250 savage to a crush fit in a cm chamber, load a mid level 6.5 powder charge, seat a bullet and shoot, no trimming needed.

Your statements seem to be contradicting each other.
The 243 which did not pass through, dropped the deer in its tracks. I see that happen more times than not when the bullet does not pass through with high powered rifle rounds placed in the heart/lung zone.
A clean pass through is where they do not tend to drop in their tracks in my experience. They fall over dead soon enough, but not in their tracks for the most part.

The 243 with a nosler partition 100 grain , through the lungs , may not pass, through although some do. Quite often you will find them inside the hide on the other side. of a white tail. I have been very happy with that performance. Never had a creedmor. old243

30TC it's own cartridge

a littel shorter in length than the 308 and a bit larger in the body of the case to get a tiny increase in volume and a sharper shoulder

but enough that it took a 308 that was almost everything a 30-06 was to the 30TC which is basically claiming to be everything a 30-06 is in a short action


it is almost a 308 ackley improved , Ironicaly Ackley never made a 308AI because he felt the gain was too small.

there was also never a 260 , 7mm-08 or 270 AI the gains would be so small the expense wasn't warranted.

I suppose it also became necessity with the weaker 7.62 nato actions around that a new case not fit any action that isn't short magnum capable

30TC applies some of the short magnum technology without getting into magnum territory to get gains on a 308win to achieve 30-06 velocities.