The first thing before you buy a lot of bullets, is to find out what
the twist in in your barrel.
14:1 down to 9:1 are all possibilities and each handles light to
the heavier bullets better than the other......... usually.

The 55gr is the middle of the road do every thing bullet if you
can't find a special bullet for your weapon.
A "Ball" or full metal jacket is a lower priced bullet that works
well for plinking and testing out loads and comes flat base or boattail
as well as a spritzer lead tip or hollow point.

The heavy 70gr Speer might not settle down in some rifles but
in my 14 twist it will give me groups under 1" with H414 or 4895.
However I am shooting the larger cased 22-250 for the Nevada winds
and wide open spaces that is home.

Enjoy your 223.