yes as a matter of fact i do have a favorite load. I shoot a czech military mauser which I sporterized. I agree the factory loads are a little weak. The load which I have had the most luck with is a 180 grain Nosler boat tail ballistic tip, this is a hard hitting deadly load. I use 48 grains of IMR 4064 powder, again, this is my favorite powder for the 8x57. Seat the bullet to an overall length of around 3.100.
Good Luck, the 8mm is a great round.