heavier bullets mean that there is more inertia behind the bullet however more weight means that outside forces like gravity are stronger and they tend to lose velocity faster and drop more over range. most 30-06 are capable of stabilizing anything from 110 grain lightweight varmint bullets to 200 grain heavy game bullets. 165(plus or minus 10 grains) is a good medium. SSTs are good for medium game like deer but if you ever decide to go for larger game like Elk then a nosler Accubond or Speer Deep curl in the 180+ grain area would serve you well.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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