I don't know about seconds, they can be changed easily, sure, but the average person would probably take a minute or 2.Between 100 & 150 yards … ok
A 300blk pistol for CQC and a 556 upper for the other
Both will fit in a standard tactical backpack and interchange in seconds
The 300 would be for home defense/CQC, the 556 for longer range/ open areaI don't know about seconds, they can be changed easily, sure, but the average person would probably take a minute or 2.
That said, having a 5.56 upper and a .300 blk upper wouldn't be a bad idea for logistic reasons. 5.56 is cheaper for training, gives you more ammo options if things get scarce, and both calibers can use the same magazines.
That's a very subjective question. Depends on what you consider effective, the optics, the target, and the skill of the shooter.What is the effective range of a 300blk pistol with a 10 in. barrel
I would actually take 300 blk over 5.56 for range. 300 blk has suitable energy retention out to 460 meters where as 5.56 falls off at 250. Granted, that's assuming a full-length (16") barrel for both, but you'll see similar differences out of a shorter barrel. How effective each caliber is at those distance will, as others have said, depend on the shooter.The 300 would be for home defense/CQC, the 556 for longer range/ open area
I have CQC training