The 6.5 Creedmore is actually a 6.5-250 Savage Ackley Improved, which is why it can be formed from 22-250 brass. And I read that the 30TC brass works well, but since the 250-3000 predates the 30TC,
"...the parent case is more logically (to me) the 250 Savage/250 AI."
Kind of silly to talk 250 Savage/250 AI when the question is "Wanting to know what it takes... Or any other common caliber brass I can turn into creedmoor."
"The 6.5 Creedmore is actually a 6.5-250 Savage Ackley Improved..."
Not hardly, might want to check your sources...
"The 6.5 Creedmoor’s case (formed by simply necking down the .30 TC) is..."
"The 6.5mm Creedmoor is a centerfire rifle cartridge introduced by Hornady in 2007[6] as a modification of the .30 TC,[7] whi..."
"And I read that the 30TC brass works well..."
Again kind of silly since "The 6.5mm Creedmoor is a centerfire rifle cartridge introduced by Hornady in 2007[6] as a modification of the .30 TC,[7] whi..." Would think Hornady, which created the cartridge would know more...
"...but since the 250-3000 predates the 30TC..."
The parent of a parent, is NOT the parent...
The case the 6.5 Creedmore was developed from (making it the parent) IS the .30 TC...
T.