Jorge, I have never shot a TF-98 rifle so I can't give a fare comparison betwen them and the 350's. What I can offer is my opinion of the 350's,...or in my case, the B-28 clones. As many of you know, I have two. one in .177, and .22. After shooting both of them and learning the nuances and characteristics of this styl and design of rifle,...I have nothing but praise for them. One poster on this thread feels that the 350's are a poorly designned rifle,...and that's ok and I respect his opinion,...but to me, nothing could be further from the truth. I think the 350's are a well designned and very efficient rifle. They are well balanced rifles if held correctly, and are rather easy to cock and shoot extremely accurately,....once you've mastered them,...and that is not an over-night learned lesson. It takes alot of practice, diligence, and above all patience in not only the rifle, but in youself as well. I admit mine were both tuned by MM,...and I've re-worked the both of them. Many folks think they are heavy,....and even "barrel heavy", but I don't think this is the case at all, but because of incorrect hold of the weapon, any one can see why such statements would be made. The 350/B-28's are "long guns", not heavy rifles. Want a heavy rifle,...pick up a RX-2 and shoot it for an afternoon., then grab a 350 and you'll think you've picked up a Crosman Quest!!!!!
On the power scale compared to the TF-98. I don't know, but when shooting my .177 B-28, anything under the 10.2 JSB heavies shoot SS, and POI rises in a shot-gun pattern!!! 8.8 CroMags can hold the best SS groups of about 1 1/2" off-hand at 25 yards, but the groups shrink alot with the JSB's and Kodiak/Baracudas. Personally I hate it when It shoots SS. Just not a good recipe for rifle/spring longevity. But I know it definatly has the juice and accuracy if the power is harnessed with an apropriate weight pellet. The .22 B-28 is simply a joy to shoot, and is still my fav gun to hunt with. Smooth in every facet, and more accurate than the nut behind the trigger.
I bought a Chroney about a year ago,...but it's been awhile since I did any velocity checks,....and to be honest with you,...I could care less how fast they shoot. The chroney is more or less a tool for diagnostic checks,....and is for the most part collecting dust in my shop!!!
That's my two cents on the 350's/B-28's, and agree with me or not, they are fine rifles. And if you dis-agree with me, that's ok too because we're all entitled to our own opinions, and and I respect others ops as well!!! Ain't BB-Guns Cool?!?!?!? LOL's, Thomas