Jerseyboy
The 25/308 has already been done mate it's called the 25 Souper
If you want something different I used the 303 case necked down to 25 caliber. Blew it out and shortened the neck.
I call it the 25/303Epps Newton improved.
It gets the 100 grain Barnes TTSX going at 3,660 fps and the 117grain SST or 115grain nosler combined technology silver tip out at 3,360 fps.this is using a healthy dose of Hogdon superformance.
Bob Nelson