Mark , These pellets are gun in most .177 , I use them in my HW97 as well
Could never get them to work in any of the BSA PCP guns ,kept jamming , BUT found if you push the pellet in the mag a bit further ,no jamming and deadly accurate ,tried them in my ultra and r10 fantastic !!
Voymir are great to deal with ,well packaged and quick to come ,been using them for a few years now and never had a problem