The right choice in pellets is one of the things that is only achievable thru trial and error.
As you know from reading my other post I just got a HW35E that I resurrected from it's misused past. The gun is an absolute joy to shoot. I have had an HW35EB for 40 years. they both perform well.
I have on hand a variety of pellets that I used in my HW35EB which I purchased in 1979. These ranged from Mount Star (Japanese) Diabolo, Jet and Silver Jet all of which were sold by Beeman's back in the day. All shot well with 1/2" 10 shot groups at 10 yards with Open sights or Peep sights. These guns both have always done better with H&N Match Wadcutters and as such I have used those almost exclusively for nearly 40 years.
Surprisingly the Mount Star Diabolos shot within 1/8'' of the H&N Match pellets, they just don't leave a nice punched hole in the paper. These pellets were $2.59 for a tin of 500 back in the 80's! Those days are gone! I just opened the new tin of those, and will shoot them up eventually.
All of the 8 different pellets I grouped yesterday shot nearly the same with the best group going to the Beeman Silver Bear HP which I have had for at least 30 years. The new pellets of choice are the JSB Exacts which are heavier and yet shoot very well. The only disappointment was the new JSB Monsters (13.4 gr) which were all over the place. IN my R1 .22 the JSB Monster pellets at 25.4 gr were excellent. go figure.
Crossman Wadcutter pellets were pure garbage with mould separation lines on the sides and 1.5" groups. Paid $7 for a tin of 250 and only shot 10 of them. The only good thing about them was the actual tin which had a screw off lid.
I also had some copper plated pellets which got stuck in the bore and had to be pushed back out with a cleaning rod. I only shot 3 of them before getting 2 stuck in the barrel in 2 shots.
So for that gun it looks like the pellets of choice will continue to be the H&N Match and JSB Exacts as those will cover all the bases. I will probably continue to shoot up the others just to get rid of them.
For the .22's I have two completely different guns. An HW77 under lever, and an R1/HW80. Both guns are accurate but there is a definite difference in power. Like 100+ fps!
Both shoot H&N Match pellets well. both shoot H&N Barakudas well they both shoot JSB Exacts well, but only the R1 has enough beans to shoot the JSB Monsters well and they grouped inside of 1/2" so they will get used in pest control.
I have some pellets that have some kind of soft metal fronts with plastic rears which I have yet to try. Don't know how those are going to work?
So as you can see they only way to figure it out is to shoot a bunch of different pellets and see which ones your gun likes the best. Most will shoot OK, but some will definitely be better and those are the ones you buy more of. You can use the others for plinking until you use them up or give them as gifts.
In my opinion the H&N Pellets and JSB Pellets are the best out there. YMMV.
I highly urge you to find the good ones and stop looking, just like I do when I find a load for one of my rifles that yields acceptable accuracy. Then go shoot something with it! Endless sighting and paper punching for groups is not the purpose of any gun, except a Benchrest Rifle.
You find a load, you sight the gun in for that load, then you go shoot something.
This is the intended progression for shooting sports.
It should be noted that Pyramid Air has 19 pages of .177 cal pellets! You could spend a fortune just trying all of them out. Instead, try reading some of the reviews, they will eliminate about 95% of the choices for you.
My .02 on this subject YMMV
Randy