Some barrels shoot better clean and some better when fouled. In your case,you have to shoot the rifle more to find out. Yes you could clean every so many rounds if you want but if you do not try this.....
The round robin technique, it will eliminate fouling errors somewhat. Fire a single round at bull # 1, then #2 and so on till you have fired 5 shots at five different bulls. Your barrel should be warm by then and you can give it and yourself a rest. Let the barrel cool and continue this until all 25 shots are fired, when done you will have five 5 shot groups fired in a way than all were shot with simular fouling.
In the picture I posted earlier in this thread, it shows an example. The only thing dfferent is that I used 3 shot groups and 10 different bulls for a total of 30 rounds fired. There was no cleaning of the barrel at any point. This was a ladder test with .3gr increments. I started upper left to the bottom right. With having 10 differnt loads, you have to have your witts about you as to keeping right order and load. Shooting the same load is much easier.