You would be better served if you moved away from both if you plan on being extremely competitive in the Schuetzen game. 4759 is the better of two by a long shot but I have found the magnum pistol ball powders to be a better choice. If you have an interest in heading in that direction send me a PM with your e-mail address and I can get you headed to that road of success.

J.Louis

I shot a fair amount of 5744 in 45-70 and 38-55.   my (lack of) skill is such that I cannot comment on the relative accuracy.  but I'm shooting 4759 now and in my experience the 5744 leaves a lot more debris in the barrel than 4759.

Have to agree with DW.  When I used 5744 in my 45-70 there was a lot of unburned powder left in the bore.  It was dirty enough, and no fun to shoot off from the bench, that I went back to black.  Smaller cases, maybe a different outcome.
Mike

Cast Bullet Association members use a lot of 5744 with there gas checked bullets and seem to do quite well with it.   

I have tried it in several different cartridges with plain base bullets and it has never worked as well as 4759.

My impression is that 5744 is a high bulk/(relatively) low pressure designed for heavy bullet loads in large cases.  I believe it was originally a surplus powder used in the .50 BMG.

Even though it is nominally a low-pressure powder it seems to burn more completely with more pressure within its range.   IE 500 gr bullets in 45-70 (or solidly crimped 400 grain ones on an experimental basis).   Even though there were unburned grains left in my rifle's 27" bore with 510 gr bullets it shot very well off the bench @ 200 yds (we won't discuss recoil).  I was using substantial 25 gr+ charges and a cork over powder wad and breech seating the original nose-pour Lyman-Matthews bullet.

I later had DARR-Borton moulds made that precisely scaled that bullet down for 40 cal and for 38-55.   I've never got around to getting the 40 cal rifle up and running but the 38-55 shot almost as well with 5744, again shot breech-seated.

I have since pretty much focussed on 22 rf specifically to learn to shoot offhand and to develop better shooting skills. 
When I get back to center-fire it will be with a late era Swiss martini international rifle in 7.5x55 and with 4759 loads

I still have several cans of 5744 and if I decide to start shooting buffalo matches that would be my powder choice for the 45-70

Could be the 40/50 Bottleneck case produces more pressure than something with straight sides and gives a better burn with the AA 5744 Speculation only

Big advantage ot 4759 or 4227 they don't need a strong bullet pull or heavy bullet to burn well.  Listen to the guys with good results in 45/70 using 3031 or RX 7 all use heavy bullets and strong crimps .

I use 4 single shot powders. Black in any of them, 4759 in the larger cases 4227 in the smaller and Unique when I want sub sonic with light bullets. Others may work well these 4 cover all requirements

Boats

Both powders shoot pretty dirty at Black powder velocities. I can't say about 5744 as I tried it years ago got pretty indifferent accuracy and dropped it. 
  4759 shoots cleaner the more that you push it. It shoots pretty clean about the time that it shouldn't be shot in all but the strongest actions. However it does shoot very well in a wide range of cartridges from .32s up to the big .50s.  The fly in the ointment with 4759 is that it doesn't meter well small quantities. The .38-55 is right about on the dividing line above that it meters OK below that you need to drop short and trickle powder in to a given weight. 
MP300 is a ball powder That John Lewis and others have used with great results. It is a ball powder and meters well for best results Winchester Magnum  primers Must be used. 

40 Rod