if I were converting a G21 for hog hunting I would have gone 460 Rowland instead of 10mm, or just bought a 10mm glock or maybe traded for one. with the Rowland you can still shoot 45acp with no mods, but I'm not sure how the 10mm conversion compares cost wise to the 460. I've seen the ammo available at more places than I expected in 460 as well. but then I reload too.