OK, support that theory. Walmart stocks the last three US standard issue rifle calibers, and the last three US issue pistol calibers. (.38 Spl. counts as was issued to aviators and MPs. (CID) ) It also carries the last two issue Russian rifle calibers, 7.62x54R and 7.62x39. Many former vets buy guns in these calibers and keep up their marksmanship skills with ammo bought at Walmart. Many who never served buy guns in these calibers, and while not every AR owner is a Tier One Operator, they don't all necessarily buy their ammo at Walmart. As I posted in post #40, as it happens, with all of the guns I own currently, minus BP, the ammo can be had at Walmart. I assure you I am a decent shooter. I'm not Carlos Hathcock, Lones Wigger, Doug Koenig or Dan Bonilla, but I hold my own. Why gosh, my store even sells .300 Blackout. (Not much of it, though.) Caliber choice does not add or detract from one's marksmanship.Rounds downrange sent with purpose and lessons learned from them add to one's marksmanship. Having a .338 Lapua or 6.5 Creedmoor doesn't turn you into SuperSniper, practice with them might. There are some very deadly shooters out there who only shoot .308 or .30-06. (Both available at Walmart.) If you were to amend your statement to "If you buy all your ammo at Walmart and get out once a year, you probably are not much of a shooter", I'd be more inclined to agree with you. BTW, you can order bulk ammo if it's not instock, and the shipping to the store is free. Ask your local Walmart's Sporting Goods Dept. Mgr.