A peek at Midway shows Creedmoor Hdy factory match for < $26/box of 20. Load data is on the box, so it can be reloaded w/o a lot of experimentation. A target shooter could afford to use factory, and not reload. Hornady decided to have it available at low cost from the beginning. Other than .308 Win, I do not know what match ammo is this low in price.
Other 6.5 cartridges have match ammo listed, but more expensive.
6.5 SE list has some < $20/bx Prvi, but the match ammo is Lapua, etc. and the price is much higher. The Prvi would let a person get started with a hunting rifle w/low ammo cost. RWS has a 140-gr dual core load at over 2850 fps - hottest 6.5 SE load I have seen - do not know test barrel length.
6.5x47 Lapua factory match ammo is expensive ~ $59/box.
.260 Rem list shows Cor-Bon match at ~ $47/box.
They would all be low cost and easy to hand load. Creedmoor is the only one I would shoot much with factory loads.
