Louis Ohland wrote:
Says it all. What grades are suitable for what applications? Grab that
1.25" round of 1018 and make my own action...

What kind of action? What type of cartridges? What kind of finish do
you want on it when you are done?

Not enough information provided Louis, as there are too many variables.

Best bet is to read what the makers of similar actions are using.

Suitable for a stainless bolt action is not suitable for a color case
hardened black powder receiver, etc.

Whatcha hankerin to make?

Cheers
Trevor Jones