My personal experience for schooling shows this year has been that the scores are a little bit higher - usually by just a few percentage points, but not as much as 10%. These judges have been L grads and r's. But, fortunately, the comments have been spot on.
I did my first schooling dressage show last month and was told the scores were quite low. Luckily - I had good, constructive written comments that I felt were right on and were areas that I agreed needed to and should be worked on. Having been a hunter rider my whole life - I am hooked! Constructive criticism AND ride times?!?!?! Swoon!
From my experience, they don't seem to be any different. I just started competing in dressage this year and I seem to get about the same range of scores at schooling shows right up to the bigger "gold" level shows.
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In my experience I have always felt the schooling shows were about 10% higher than the recognized shows. So if you are getting 70s at schooling shows, then you might expect something in the 60s at a recognized show. Of course each judge is different though.