I forgot to mention that there are other weapons that are NOT explosive that get grenade damage buffs. The two I know of and use most often are:
-Blockhead. I use a Fire BotA with that one.
-Twister. Shock BotA on that one.
-Hornet. Super great for killing loaders, I use it with a Corrosive BotA.
-Pimpernell. I have one in fire, shock, and corrosive. Use the bones with this one.
All great suggestions so thanks for that. I’ll play around with a few different things this weekend and see what I land on.
No twister never got reaper on the splash, after the patch when people including myself said the twister got reaper again we were talking about on the bullet.
For around a year the twister got no reaper at all, not even on the bullet.
No mention of me 
Nah not really lol
You said you were taking a break. 
I said I got back into bl2 a few days ago.
Oh right, you did…congratulations? 
Just kidding. 
Since you’re here, Pimp, any advice for the OP?
You’re lucky I like you. Lol.
To the op the build looks good. I personally always want resourceful in my explosive builds because of battlefront. I would suggest a grog so you can heal off your grenades tho I’m sure someone already said that.
So after about a week of tinkering and killing of come to a conclusion. I F*****g love the SWORDSPLOSION.
I ended up settling on this build.
http://bl2skills.com/commando.html#55055152015005515010005050140100
Later when I have more time I’m going to go thru the master build list for Axton and see if it matches any, I hope not, I’d like to do a kinda write up about my time with the SWORDSPLOSION.
It’s a great shotgun provided you remember not to use it up close… 
That’s part of its charm. If you haven’t killed yourself multiple times in a single Swordsplosion session you’re not worthy of the gun.
Some of us like staying on our feet, Hattie. 
Wait…what am I saying? This is Krieg we’re talking about. 
Yes, how’s that permadeath Krieg run going
That’s basically my current explosive build for Axton. The only differences are I don’t have any points in Phalanx Shield, Mag-Lock or Grenadier. I’m not spamming grenades with this build and I prefer my turret on the ground, so I don’t really miss them. Instead, I have Quick Charge maxed out and the other points in Expertise. I also have one point in Resourceful and only four in Sentry, since I wear a Legendary Engineer with it. My relic of choice is an Explosive one. I’m still fine-tuning, though. In my opinion, your build is looking pretty good.
The SWORDSPLOSION givith and the SWORDSPLOSION takith away.
I’m using them for slagging, not necessarily spamming but its nice to know I have em if I need em
I don’t see anything wrong with that. I see Mag-Lock, Phalanx Shield and Grenadier as “optional” skills that you take depending on the playstyle. You got all the essential splash/grenade damage and survival skills covered in a well balanced build, so it makes sense to spend a couple of points on skills that favor your personal playstyle.
Totally agree. I had enough for all the major skills I wanted and put the leftovers in those 3.
I have to try this permanent death run
Also I like this build I just can’t skip resourceful in an explosive build.