HW-97K .177 pellet choice

I own this gun for several years, now I’m confuse that all the forum said that this gun loves lighter or medium pellet and heavy pellets can break the piston

I have use barracuda match 10.65 gr for several years and this pellet is the most accurate for my HW-97K.

try rws dome also but not as accurate as barracuda for 30 meters.

so, any people here use another pellets that still accurate as barracuda match for HW-97K

Note : my HW-97K is 750fps with 10.65gr so it is about 13.5FP energy.

thanks
markus