I'm thinking of building a SBR and are wondering what calibers I should look into. The weapon will be used for mostly HD/SD plinking and maybe to take out a critter if need or just was handy at the time. The weapon will be suppressed in the end and looking to keep barrel length under 10" w/can. Not sure if I want to go pistol caliber but if I do I'm looking mostly at 10mm as the pistol caliber. I do know that there are some rifle caliber like 300blackout but don't know anything about them. What do you guys with SBR think as far as caliber and rifle/pistol chambering.