Until you blow the primers or split the brass. You are at about max now. 100 fps isn't going to get you anything, if you are getting good results just shoot it. If you want a speed demon step up to the 257 STW, or a 257 weatherby would be next in line. You can only drive a bullet out of a .257 hole so fast that the amount of powder burnt just doesn't equal out to the results you get. The 25-06 is about as efficient as a 25 caliber round as there is out there. Hybrid 100v shows some interesting results, look on hodgdon reloading page for info.