I think the creed will perform better than the bob if throated properly.
Gibb -
Howdy !
Review of each case' spec's shows that the .250 Ackley improved has a 40* shoulder angle and nominal .455" shoulder diam.
A notional .250 Creedmoor would have a 30* shoulder angle and around the same shoulder diam as what the .250AI has.
The .25 Creedmoor ( I believe ) would have a slightly longer base-to-shoulder dimension than what the .250AI has.
Tthe powder storage area covered by the .25 Creedmoor would be slightly larger than that seen on the .250AI ( owing to the former's shallower shoulder angle ).
That fact added to the .25 Creedmoor's slightly longer base-to-shoulder dimension would result in it having a tad more case capacity that the .250AI ( IMHO ).
Case oal's are very close.
Brass preference would possibly bias one's decision ....one way or the other.
With regards,
357Mag
The Speer .25 Caliber bullets are amazing, real sleeper. Speer Hot core 87 gr. bullet. It is not new and "sexy" but it works. Out of a 25/45 Sharps I've gotten 1/4" groups from an AR. See my attached newsletter, page 12.Forgive me if I'm asking a previously asked and answered question, but I haven't found one addressing this topic in my search so here goes. I'm a big quarter bore fan. I've owned the 257 Roberts, and currently have a 250 Savage; a 250 Savage AI; a varmit barreled 25:06; and a sportier 25:06 AI. I've been looking at another 257 Roberts, but I'm seeing some information about a 25cm. My research has been sketchy and it seems to be known by different names. So I turn to where I always turn - to those who know best and can provide the most relevant and detailed answers. Who has or has shot one and where does it fit in the 257 caliber family.