18.1 JSB vs 25.4 JSB in Condor

[N3486N]

Does anyone have any test data for these pellets from an accuracy perspective in a .22 Condor with 24 inch barrel?  I have been using the 25.4 and getting strings of really good groups then the groups seem to go sour. 

Any feedback on accuracy comparisions and ideal velocity ranges, etc would be appreciated. I have good experience with the 25.4 but none with the 18.1.  I have heard from some they like the 18.1 better but they have not provided much data.  Thanks.