In a 98 Mauser:
Metalverkin brass
CCI 250
270gr Speer SP, seated as long as the mag well will allow, 3.140 IIRC
H335 at 56gr will give you 2460fps.
Be ready to change out your front sight bead for one at least 1/32 to 1/16" higher because you will be hitting up to 8" high at 100 yards.
Trust me, it will........
This was nowhere near max in my rifle, it was just where I got to in a very short amount of time before I went on a trip last fall.
Groups averaged 1 1/4 at 100 yards. This was with once fired, neck sized cases too.
I tried H4895, IMR3031 and H414 I think but they didn't perform as well.
Hope this helps.
Noel