The .45-08 cartridge is made from .308 cartridges cut down to .898 length. The cases are then reamed out to .452. I will not publish loads because some idiot my try loading them in a regular .45acp case. Gunnar who posts here developed the cartridge and cases and loads may be gotten from him via
http://www.armco-guns.com/ @ $1.00 per case. Gunnar reports 1500 fps out of his gun but loads his rounds a bit stiffer than I do. My loadings which are conservative drive a 200 gr hardcast LSWC 1,350 fps. The only mods required are a 20+ lb recoil spring and a shok buff. I high quality 1911 should be used. I use my Norinco A1 - the steel in the Norks is hard.
If you decide to load this cartridge I suggest weighing each charge.
Recoil is a bit stiffer than a .357Mag/.45Colt loaded heavy.
Great bear gun, way faster than a wheel gun.
I can fire my 1911 just about as fast with this cartridge as my .45acp and just as accurately which is more important.
If you contact Gunnar tell them where you got the initial info from.
Stay Safe