My three 177 HW30s usually do best with 7.33 AA then JSB 7.33. If you're splitting hairs they occasionally do better with some good fitting tins of 7.87 or 8.44 JSB or their AA clones than an occasional bad fitting tin of 7.33s. The 7.33s are usually your best bet.

H&N 8.64 Field Target Trophy usually do good as well in my Weihrauchs. I lean more on the JSBs because they produce more power and stay tighter past fifty yards.

This is assuming the OPs rifle is 177.

The 22 caliber Weihrauchs I've worked on including HW30s do best with H&N 14.66 Field Target Trophy. At least at ranges under fifty yards. Never shot 22s part that.
 
Cphp do well in a hw there my most shot . well about only ones i shoot.

But what works great for me, him, or some other guy may not for you or your gun .. why most buy and test each gun for best pellet . Then of course my saying is " i dont mind a pellet picky gun as long as it picks crosman hp" 😉

I like to start with my cheapest most easy to get available local pellets first . Then if its fown to fancy mail-order pellets it's probly finding a new home