tractorat,
You know that an "ex" is a has been and a "spert" is a drip under pressure??:-laf
Ammo sales is just that. There are loads with standard Lead Cored Projectiles. There are LCP's with the cores soldiered to the jackets, There are twin cored bullets (Nosler Partition), There are match quality hunting projectiles. There are solid copper projectiles, And numerous variations of these. Those made with more advanced manufacturing methods, newest technology or PC materials are usually the "most expensive"! But that also depends on proximity to hunting seasons and demand.
Buy what shoots best in Your Rifle. Wait for pre-season sales. Buy multiple boxes of the same ammo with the same lot number. That number is found on the inside of one of the end flaps of the boxes. Don't wait till the week before hunting season to get yer ammo!!
I hope this helps?
GregH