10m definitely harder. The 10 and 9 is roughly the same size as a 6yd target.

My PB ex 300 for 10m is 277. For 6yd it's 295.

I find that 6yd is good exercise for concentration and pressure, because it's not really about hitting 10's, it's more about not hitting them all the time.

I have never hit a possible 50/50 in 10m, in 6yd I have seen several.