[johnnie]

Looking for case dimensions for a 6 mm Ackley Improved.

Got a Win M70 in the shop, had a barrel replacement - barrel was not stamped to indicate caliber.

The chamber cast indicates it's in the 6mm/244 area and has an approx. 40 deg shoulder.

Any help appreciated. :confused:

Thanks

[swifter]

The "Rule of Thumb" on an Ackley chamber is to cut it so there is an approximate 0.005" crush fit when chambering a factory case.
I've noted that my AI cases shorten slightly in fireforming. I'd think you could subtract 0.004-.006" from the casehead-to-datum line measurement of a .244/6MM Remington case and be in the ball park... Or I could be wrong as hell...:confused:
It sure sounds like you have an AI chamber to me. Take- or send- that chamber cast to a 'smith experienced in AIs.

Good luck,

Tom

[Ross]

The RCBS disc shows the .244 Ackley as having a 30* shoulder at 1.7250" from the base, and the neck at 1.8810" up.
The shoulder diameter is listed at .4560"
I have seen a reference to an Ackley #2, with a 40* shoulder IF I remember correctly. That is a huge IF. Mnemosyne has neglected me a lot lately.
Cheers from Darkest California,
Ross