All 7 of my .177 SPA guns shoot 10.03 Knockouts well. My Bullshark spits them out at close to 1000 fps and it will do moa at 100. The sound of those little bombs hitting a pest is addictive.
I can only reach 100 if I shoot across my property from one end to the other, so I have to haul everything to the bench and set up for it. There is a nice hump in the middle, so I have to hang my targets about 7 feet up to see them from the bench. That makes it more difficult to change them out...
I'm blessed to have just over 100 yards that I can safely shoot on my property. I do enjoy the challenge of shooting that far, but it's a lot more work setting up for it and waiting for a day that the wind cooperates. It's much more pleasant to just sit and shoot 10 to 50 yards off the back porch.
I've been hand pumping for over 20 years. I've owned several pumps and my latest is an Air Venturi Hill mk4 or 5. I can never remember. I've been using it for the last 4 years and I've only replaced one o-ring.
Like you, I do it for the exercise and my reward is shooting. That works for me.
I'm an electronics technician, too. I prefer my guns to be simple because I spend enough time looking at schematics at work. I'll keep my batteries in my flashlights.