I think you would find next to no improvement in speed at equal pressures and the other advantage of improved cartridges, less case stretch would be hard to recognize in a win 94.
More than that it would be pretty darn expensive.
You would need custom dies and there going to be full customs for 356 improved.
The barrel will need to be set back for the re-chamber to be done properly and along with the cost normally associated with a bolt gun setback you have the indexing of the sights to worry about as well as remounting the mag tube.
If your looking for a bit more range see if realoding with the Hornady flex tips helps, they should provide a slight improvement in BC.
The setback wouldn't necessarily need to be done. As an example, the 30/30 AI isn't setback, just reamed out. Since they headspace on the rim.
