Charles Roberts practice set.
im doing pretty well with all the notes up to high A
when i try to get to high B the reed just stops like its stuck…
it could be just me still not knowing how to control that note, but im not sure…
what can i try without risking my reed?
any comment would be greatful 
Try “walking” up to the B from G, then A, then B. For many chanters (so I’ve heard), it is difficult to hit this note directly. So you have to do a quick run up to it, almost like a couple of grace notes before the B.
Something I know about, but can’t yet do! ..at least not at full speed 
Good luck.
-gary
How do you get to the note? Start at octave G, then octave A, then octave B. Don’t close the chanter or grace the note with any finger more than one hole above octave G or you will drop the octave.
If the octave drops out at octave B, try adjusting bag pressure down as the tendency is to blow harder which may be the wrong approach.
You could try opening or closing the reed lips very slightly and note the effect.
Any note above octave G can’t be pressured and fingered directly, you will most likely have to “vent” the note with a brief proceeding one finger F# or G (make it too brief to actually hear, just a quick pop up and down with the vent finger) before fingering the A or B or above.
Sometimes new reeds from makers have difficulties going above octave A and if the suggestions mentioned don’t fix it, perhaps it’s time to send the reed back for replacement or adjustment.
To save frustration (or create it, one or the other), I just make my own reeds as I have only gotten one good reed from any pipe maker, and they hate to send replacements and I hate to be without my chanter playing.
My definition of a good reed may be fairly rigid as I like a strong firm back D with especially A, G F# and hard D (possibly needing an A cut) playing in tune at one pressure, and the same for the top octave with a slight pressure change. The reed should reach and hold top D easily and at the same pressure as other top octave notes. The only note that should have to be blown into tune is the octave E.