EGW bases for a Savage Axis will NOT fit on a Tikka. You would need a Tikka specific base such as SKU 44000, 54000, or 80500
Yes, this mount will fit any/all Savage Axis rifles. The hole spacings do not change due to caliber on this gun.
The 0 MOA Evolution Gun Works Hunter Savage Edge/Axis/Axis II Picatinny Rail should be just fine for your setup. MOA will provide the shooter with more elevation adjustment at much longer distances (700-1000 yards).
This mount is drilled out for #8 screws and comes with #8 screws and #6 wide head screws, so it fits both applications. It doesnt matter if you Axis is short action, long action, #6 screws, or #8 screws this mount will fit.
No that would not work, but this one will: KK-T8-HSPR02-51100
The only warning provide is in regards to the serial number. Savage Axis Rifles with serial numbers higher than N936371 are drilled and tapped for #8-40 screws and will not fit this rail.
Yes, it should fit.