I picked this rifle up back in the spring of 2011. The model is the AA 510TC Twice. It is Air Arms solution to increasing air capacity, without going to a bottle gun design. In this case, they have mounted two standard size air tubes side by side to achieve that goal.
For many decades, I hunted California Quail with a side by side Browning BSS, 12 gauge shotgun, and always liked the way that gun rested in my hands. That positive experience naturally drew me to the AA 510TC.
The AA 510TC is a bit unorthodox for sure, but I decided to try one anyway. No regrets here. This thing has turned out to be one heck of a shooter. My original pellet of choice for her, was the 18 grain JSB Jumbo Heavy.
The first time that I took the rifle out, to sight it in with that pellet, it about blew my mind. I've got some accurate PCP's, but this one set a new standard.
Below, is the first target I shot with this gun. The three stand alone pellet holes, tracked exactly to the adjustments I was making on the scope, to get the crosshairs centered on the bullseye. I then moved up to the eye on the prairie dog target, and proceeded to put five 18 grain JSB's, pellet on pellet at 50 yards. Amazing accuracy.
A 3000 psi fill gives me a useable 60 shots. She sends out the 18 grain JSB's at a average of 856 fps at the muzzle. That's good for 29 fpe. I'm guessing that she is pushing the 14.5 grain PCP-2's, out in the low 900 fps range. I'll have to set up the chrono, and shoot a string or two, to know for sure.
My scope of choice for this gun, is the Nikko Stirling Nighteater, 4-16x50mm model, with the mildot crosshair. It has very fine crosshairs, and small mildots. Works great for what I do.
My primary use for the rifle, at that time, was for hunting prairie dogs. Head shots to 100 yards were not a problem, but that was with her shooting a lead pellet.
I have an opportunity, next month, to hunt California Ground Squirrels again with a good friend of mine. As usual though, the ranch we hunt requires the use of non-lead ammo only. Including airgun pellets. I want to hunt the AA 510TC, so it's time to see if she'll shoot tin pellets acceptably well. Acceptably well being, half inch five shot groups, or better at 50 yards.
I loaded all of my gear into the 4Runner, and headed out into the forest to see how she would do on paper. My non-lead pellets of choice, would be the H&N Baracuda Green, and the DYNAMIC brand PCP-2's, in 5.54mm and 5.56mm head diameters.
I started off by putting the target frame out at thirty yards. If the gun won't shoot a bug hole at thirty yards, with a given pellet, I don't waste my time with that pellet at 50 yards.
Next, I ran the target frame out to 50 yards, and using a fresh orange dot, fired five more PCP-2's. Below is the result of that effort. As usual, I'm shooting over my wind flags. Without them, I'm pretty much just wasting time, air, and pellets when accuracy testing out-of-doors.
The orange dot, on the right, is half inch in diameter, so I'm quite happy with the result. I cranked in some elevation, and right windage clicks on the scope, and then moved over to the Shoot-N-C target. Holding center on the 3/16th inch orange dot, I touched off five more. The result was a nice bug hole at about 11 o'clock.
I removed 8 clicks of elevation, put in 3 clicks of right windage, and moved up to a sabertooth prairie dog target. Holding on the eye, I sent a pellet down range. It landed on the left edge of the eye. Moving over to the earhole, and holding on it, I sent another tin missile down range. It landed just low. I racked the side lever, to load another pellet, and immediately sent it down range. That one almost landed in the ear hole.
I consider the rifle sighted in with the PCP-2, 5.54mm tin pellets. Any of those three shots would have been a sure kill on a real prairie dog. The ground squirrels aren't going to be real happy when this rig shows up next month.
I tried the H&N Baracuda Green, and the DYNAMIC PCP-2, 5.56MM pellets, and neither one would shoot a bug hole at 30 yards, so I'm going with the 5.54mm PCP-2 tin pellets for the California Ground Squirrel hunt next month.
This time around, I think I'll try and get some video of this rig perforating a few ground squirrels. Stay tuned, more to come.