I use Speer bullets but I use the Grand Slam in .270 Win 130 gr for deer and elk.
For whitetail just about any soft point 130gr .30-30 bullet should perform well. For deer you don't need to get too picky as far as bullet construction goes. Any standard soft point in the appropriate caliber will do, but I'm sure you'll get a slew of varying opinions now that I said that.
One of the things I struggle with when afield is keeping my rifle clean and in good working order. Small amounts of dust and dirt collect moisture; moisture can freeze rendering your action immovable when you need it most. I have seen this happen on multiple occasions, and over time, I’ve learned the cause and how to prevent this from happening.
The first thing that you need to avoid before going afield is leaving excess oil on the gun. Oil will trap dirt and sand in all the wrong places....