The new powder Reloader #25 is king of the hill now for the 25/06. Start off with 58.0g of R#25, Fed 215 with a 100g bullet and work up to 63.0g stopping where you see pressure. Seat the bullets to kiss the lands, and use Winchester brass only. Rem brass is REAL soft!
You will be amazed at the speed and the accuracy of this cartridge with R#25.
In the custom 26" Shelin bbl that was a 12 twist the load was Fed 215 primer, 63.0g of R#25 with a 100g Sierra flat base at 3650 fps with all bullets touching at 100. All I had to do was neck size the brass for repeated firings.
On the 117g Flat base Sierra, the load was 58.0g at 3350 fps three shot groups in the very low .4's. This was an absolute max load for this rifle and brass had to be full length sized after first firing, but primer pockets were not opened up.
The loads that I listed above are safe in that rifle and if you attempt to use this loading data, start off 4-5g less and work up to these loads. The 12 twist barrel may make a big difference in pressures, and like all powders, lot numbers of powders can vary in their burning rates.
Good luck!