Joe/Cuz,
I hope you don't take offense if i add my $.02 here after your reply.
I bought a .22 B-26 and a Beeman Bearcub .177 a while back and began researching this very topic since they were my 1st springers.
JohnP, I don't have the spring wire diameter for your rifle in my notes.
Last summer I found some postings by one of the most prominent AG tuners in the U.S.
I'll trim it down here to save space:
A) Pellet size selection is largely based on spring wire diameter. Too light a pellet can fry the seal and shorten spring life. Basically, the spring needs a little weight to push against.
B) On the flip side, pellets that are too heavy can also cause shortened spring life. He states this is NOT a Golden Rule but a general caution.
C) The pellet/spring diameter relationship is more critical for .177 than larger calibers.
(He mentions RWS/Diana Magnums but not the 350 as having .128 springs.
Other side notes I noted:
Spring wire diameter .128 seems to be the magic number for heavy/light pellets.
I scoured other forums and based on my notes, whoever told you to use 14gr-15gr pellets was very close!
For .128 my notes say to use 14gr-16.5gr in .22
I personally have used the pellets you mentioned in your original post in my B-26.
The Super-H Point is basically the lightest side of the scale.
The Superdome would be good to about medium ranges, weight should be good.
The Predator Polymags weigh approx. 16gr so they are about the max.
This would all be based on a diameter of .128 If you can get that info, please post.
If the weights work for you, then the next thing is which one groups the most accurately?
Using my B-26 on squirrels, I can't honestly say that Predators are always decisively better than Domes. I've hammered 2 of them thru an arm and shoulder and coming to rest on the far side.
One was at 15 yds and the other at a measured 28 yds.
I would also humbly recommend Benjamin Domes in the black can, Winchester (Gamo in disguise) Domes, Gamo Hunters, or Crosman Premier Domes.
I've used all of these but the Crosmans for pest control.
I hope this helps some folks.
