I just returned today from the annual 300m match in Leopoldsburg, Belgium.  Weather was - unusually - quite fine, nice and sunny and almost no wind at all, in short, ideal shooting weather...
The drill here is to shoot 13 shots on the continental target (scores to 10), with the 10 best for score (MLAIC rules).
After having some problems the last few matches with my "2, I decided that - hopefully - the problem was with my brass (some cases had stretched quite a bit), and I corrected the problem, meanwhile also reaming out the primer pockets to be able to seat the primers to a correct depth.  One of the prices you have to pay when shooting an 'exotic' calibre...
 
The rifle is a Martini-Enfield, rebarreled with an Eichelberger 34" barrel and restocked with a Peabody Creedmoor buttstock and a 'free' copy of the Webley-Wyley forend, sights are aHolbrook Dr. Goodwin's for ML rifles astang sight, and a P-H sight recuperated from a 12/15 as front (cheap and efffective, lots of inserts available!).
The load was as follows:  
81.2 Swiss 1 1/2Fg (no.4 for us continentals)
card overpowder wad
Lyman Postell bullet, cast in antimonial alloy, sized to .458 and a slip-fit in the fireformed cases.  Bullets seated out to engrave the 1st driving band upon chambering.
WW large pistol primer
Kynoch brass, converted from 500-465 NE
 
Things started out quite well - 1st shot was a 9 (the kind of 1st shot you always hope for in a match), and except for a single stray in the 5-irng, I never left the 8-ring, with most shots inside the 9-ring.  Except that the 10 seemed a bit hard to reach...  Fwiw, the 10-ring is about 1.5 minutes, the 9 about 3 minutes.  
 
In all, the cure seemed to have worked - except for 1 shot, the shots arrived where called, with no unexplainable flyers anymore.  Result?  91/100, and a happy camper    And, of course, my confidence in the #2 Musket is restored...

David,
 
Tell me - that Deeley & Edge, what calibre?  #2 Musket? (most D&E's are WR, so...)  Some pics please!  Also, what type of rifling on your barrel?  Segmental, or the early gaintwist?  As to the shooting styles at the Belgian matches, it's sling only, no wrist rest or cross-sticks allowed.  Mind you, the most interesting match we have is a 200-300-400m aggregate, where the 400m leg is shot on the same target as the 300m!  VERY small...