Welcome to Shooters Forum, Dean. I hope you stick around and share a few stories.You should be able to find quite a few 98's that have been converted to 06. I would much rather punch out the chamber to 8x64 over the 8mm-06. I'll have to try 4831 in my 8x64.
If you're getting velocity that is close to 300 WM with the 8x64, it's solely a function of higher pressure. The difference in case capacity between the 8x64 and the 8mm-'06 is nominal...a grain or two, at most. If you load those two wildcats to identical pressures, you'll get basically identical velocities. There might be a small advantage to the 8X64, I suppose.Hey Broom,
The 8x64 is kinda close to the 300 win. Brenneke ammo is getting not quite 2800 fps with a 196 grain bullet. I'm getting not quite 3000 fps with a speer 170 grain bullet. The best way to think of an 8x64 is an 8x280Rem. The shoulder is about .050 inch forward of a 30-06 and that's why I use 280 brass for my reloads. If you use a barrel that is chambered for 8x57 you will have to set it back about .050 to .060 to get everything to clean up. I must say that the more I use it the more I like it.