7mm GPC exactly the same as 7mm Creedmore?

[lurcher]

I was just looking into the possibility of building a 7mm creedmore the idea would be form cases from .308 lapua or even .7-08 norma. I checked out the cartridge diagrams for these two cartridges. As far as I can tell there is very little difference except that the GPC might have a slightly longer neck 7mm CM.285, 7 GPC (based on 30 TC measurement) 0.298. Would there be any pros or cons going with either of these or are they identical to all intents and purposes? I see PTG shas 7mm go/nogo gauges for the 7mm creedmore but no off the shelf reamer on their list. GPC is an off the shelf reamer

The reason I want to go with this chambering is so I can get 7-08 performance in a cartridge I can seat to the lands in a rem model 7 action and feed out of the mag. These actions cannot be fitted with an extended wyatts box

 

[Sniper338]

Ok ill ask.... why 7 CM and not a 7mm-08?

 

[lurcher]

I have a 7-08 model 7 with a factory barrel and to get 140 grain nosler ballistic tips to seat even close to the lands (50 thou off) and feed from the mag I have to shave the tips with a meplat trimmer. Plus I like wild-catting this is my other one also in a model 7 action

 

[RustyPin]

Any Updates on 7 GPC? How short of a Barrel can you go? What about the Magnum Primer vs the LAPUA Primers? I want to convert my Adams Arms 308 to Creedmoor, but 7 GPC sounds better and uses USA Brass.