I wanted to revisit this, because it’s something i’ve been looking at consciously since you bought it up in my own sparring. I’ve also unconsciously been encouraging several of my fighters to do something similar.
I want to qualify what I wrote about it being a fairly useless technique. It’s hard to tell from your post how basic you were talking on doubling up. As many of us believe, simply coming in straight with a double right is pretty ineffective, unless you are as gifted as a Mayweather or Pacquiao. That said, I think I actually double up on the right hand a decent amount in certain situations, with good success. However, the scenario I am talking about is where the second right hand is thrown as a counter, or after a step off to the side.
Scenario 1: I’m boxing on the outside, I throw a crisp 1-2 without much weight behind it, step off to the right and catch my opponent over the top of his lead shoulder as he is coming after my initial combo. This is more of a point scoring punch, but it puts you in a good position to catch your opponent off balance and either dig to his ribs, or maneuver him around the ring with your bodyweight.
Scenario 2: On the outside I throw a crisp 1-2, and then pat down my opponents jab with my right hand, throwing the right hand simultaneously. Mayweather does this very effectively. Learned it off him, and again, it’s a good point scorer and something they don’t usually see coming.
Scenario 3: I’m coming in from the outside, aggressively, trying to push you back and open you up for some short punches in close. An active jab on the outside, pumping it out, doubling, tripling etc, then stepping in hard behind a 1-2, blocking my opponent’s counter right with my lead forearm, stepping in again behind the block to crowd you out, then firing a short straight right in return, trying to catch you offbalance going backwards in response to my aggressive body movement.
Scenario 4: Again, looking to get on the inside, although more subtly. stepping in behind the 1-2, and taking half a step back and shoulder rolling the straight right (behind a high lead hand), before firing my right hand down the middle from a very good range.
I am able to use this particular technique very effectively, as it suits my style. I am not as good at pressure fighting, personally, and try to avoid it unless I am being outboxed.
Anyway, not quite the orthadox 1-2-2 we all thought you were talking about, but maybe stuff to put into practise, if you aren’t doing it already