Acquired a Rem 700 in 243 Win today as a back up for my 308. Looking for ideas on what factory ammo to test - I don't reload rifle, not yet anyway.

Specs: 700 SPS Varmint, 26"BBL, Twist 9 1/8"

It will be primarily used for whitetail deer and hopefully antelope and perhaps a few p dogs.

Any good advice for this rifle newbie? Open to all manufacturers and bullet weights.

Thanks!