The 257 Roberts is loaded pretty mild from the factory because it started out life as a wildcat and many old Mausers were used to build these rifles on. With the Winchester +P brass it can be loaded to its true potential. My loads are not real hot but I load the 100 grain X bullet to about 3100 fps. I just have a 22 inch barrel on mine. The 243 loads run up to 58000 lbs pressure where the Roberts is loaded to 45000. In modern cases and modern rifles the Roberts can be loaded to simular pressures. The 250 Savage is also loaded to 44-45000 in respect for the old lever action and pump rifles in which it was chambered. I have a 250 Savage it tne 700 Classic with a 24 inch barrel. I shoot the X bullets in 100 grain at about the same speed as the Roberts or about 3100 fps. The X bullet because of its long bearing surface will fire this load with the same powder charge that only produces 2800 fps with standard bullets.

Although I don't load it near as hot as it could be loaded(because I don't need the velocity) the 25-06 can better my other 25's by 200-300 fps. I just load the 100 grain Ballistic tip to 3064 and thw 115 ballistic tip to 2940.

I Load my 243 to 2900 fpr with the 85 grain Sierra HP Game King. It could be loaded to 3200+ but I don't need that velocity with this bullet.