Copper coated Baracuda Power pellets

I have some in .177. Here's a comparison of them and Benjamin Premier Hollow Points, shot from my Remington Express springer:

Pellet Weight Shot 1 Shot 2 Shot 3 Shot 4 Shot 5 Avg FPS FPE
Benj Hollow Pt 7.90 746.70 753.50 744.90 740.00 756.80 748.38 9.83
H&N Barracuda Copper 10.65 599.80 611.30 596.00 618.00 614.70 607.96 8.74

I have tryied them in my air arms s510 in .22 call. my gun shooting them any where from 12 foot pounds or 38 foot pounds. . the gun has an adjustable power wheel,

​accuracy is great at 12 foot pounds but sucks when the power goes any higher than that.

I had a Marauder that would ONLY shoot the copper Barracudas accurately and NOTHING ELSE.
Sold it for dirt cheap and told the buyer to ONLY use those specific pellets and NOTHING ELSE.
AJ