FWB 300S spring gun. Designed 50 years ago. What a rifle!

The 150's and 300 FWB's are exceptionally accurate rifles. Several of the local guys have both.
In my 150, I used RWS R10 pellets, unwashed nor sorted - for .100" 5 shot groups at 20yards and .210" groups at 25 yards. Standard Canadian Match rifle, putting out 590fps with new seals. I was told flat nosed pellets would not shoot past 15 yards, this rifle had not heard that, I guess. I was able to use this rifle for indoor silhouette.
The 300's have the potential for even better accuracy, if you find "it's" pellet.