.260 Savage Ackley Improved vs. .250 Savage

by AaronB, Tuesday, April 21, 2026, 10:12 (1 day, 16 hours, 45 min. ago)

Oh hey, here are some pics of a parent cartridge case (the .250 Savage) and its derivative wildcat, the .260 Savage Ackley Improved.

...ooops! I meant "the 6.5 Creedmoor." Same difference.

Take the old .250-3000 Savage case, apply Ackley improvements to increase case volume, and neck it up from 0.257 to 0.264... this is the result. I think you could use .250 Savage brass, neck it up using a Creedmoor neck sizing die, and fire-form the case body into the chamber.

Please pardon me for never noticing this before.

And now I want to invent a 7mm cartridge in the same fashion because I'm kinda silly that way.

-AaronB