I just did some trigger work on my Savage package rifle. It has the same trigger system as the Axis.
I pulled the trigger out, soaked it in nail polish remover to soften the yellow gunk on it. Unscrewed the factory spring and removed it. (saved it for later replacement if desired) I cleaned out the threads on the trigger with Q-tips and found a length of 10-24 rod to screw in. My spring came from my "Bag O' Springs" from Princess Auto. I found one that would slip over the threaded rod, clipped to the same length as the large section of the factory spring and installed it. My first result was about a 3.5 lb trigger pull. I removed the spring and clipped another coil off. Got it down to 3 lb pull.
I took the threaded rod and chucked it in my drill. I ran the drill and filed most of the threads off of about half of it. (the exposed part, left full threads in the trigger itself) One added benefit to using the 10-24 screw is that you can eliminate the nasty over travel in the trigger. I'm down to about 0.010" of over travel now. When I had the length of the screw correct, I cut it off with a hacksaw and cut a screw slot in it with my Dremel tool for adjusting it. Everything was sealed up with nail polish to keep it from moving.
I also made some 0.008" washers from stainless steel shim stock to install on either side of the trigger to get rid of some of the side-to-side slop in the trigger.
My cost for the job was about $0.01 for the spring and 30 minutes of my time. (I stole the nail polish from my wife, so no cost)
