Best pellet in .177 BSA Buccaneer

The buccaneer comes shooting too fast from the factory. 8.44 aa were over 1000 fps.

My nephew just got this gun a couple weeks ago. He has limited air availability so I wanted to tune it down to be accurate as well as efficient for him. In stock form, it did shoot the 10.34 descent at around 940 if I remember correctly. The 8.44 were not that great. We adjusted the hs back a good bit until the shot curve was nearly flat, around 890-900 fps, from a 2500 psi fill down to 1000 psi. Over 2500 and velocity is very slow. He gets 80-90 shots on a fill, which is great in my estimation. This was with pellets in the 8-8.5 range.

Surprisingly the most accurate pellet we tested was the cheap daisy hollow points that can be had on amazon for $5/tin of 500. We only tried 5 or 6 kinds, but it out performed the aa 8.44, jsb 10.34, as well as a few others. The gun is still new and breaking in so we'll have to reserve judgment for a while and until we've tried a few different pellets. 
 
Best pellet I’ve found for the BSA barrel is the H&N 10.65 Baracuda Match with the 4.50 head. It hated the 4.52....

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Fantastic advice! I did exactly as you said. Backed off the hammer spring until the 8.4 gr diablo fields were between 890-900 and only filled to 2500psi. I can only shoot 25 yrds at my house so my groups went from about a quarter at 980-1000 fps to under a dime at 890-900. Not fantastic I realize but much better and plenty sufficient for pest birds within 50yrd. What I bought the gun for
 
One other thing to note about backing off the hammer spring.....it seemed to have been loctited from the factory. Once the adjustment screw/bolt/whatever it’s called, broke loose, there was little resistance to prevent it from continuing to rotate and I worried it would rotate off adjustment as it was shot. And that’s exactly what happened. A tin or so of pellets and the velocity changed.

Rather than completely tearing it apart to add the loctite, I cut part of an eraser off a pencil and wedged it between that black plastic end cap and the adjustment bolt. I then used black electrical tape to hold the black end cap in place so the eraser was sandwiched against the adjustment bolt, preventing it from rotating.