Hans 4759 is a very good 32/40 powder, perhaps 2nd in popularity to 4227, and only 2nd because 4227 measures easier.  As you say burn rates are very similar and loads practicality interchangeable. If you start around 12 grs working up to velocity about 1450 fps likely to find a good target load.  

Long straight cases mild charges don't show pressure signs like high velocity bottlenecks, you have to work toward a velocity and stop when it's achieved. Bulky fast powders like 4759 will spike if overloaded. Pressure increases faster than the charge. Thats why we stop when it goes fast enough for cast and targets.

Same thing for the 40/65. My 45/70 4759 loads around 22 grs use less as a starting load in the 40.  40/65 Black powder is the best choice if wanting full power loads.

Boats

For many years I have regarded 13.6 grains of 4759 behind any bullet from 165 to 200 grains (plain based lead) as my starting load.  I have shot it both in fixed ammo and breech seated.  I regard 4759 as my "go to" powder for 32-40.

Froggie

Thanks all 

I will try some loads tomorrow at the range . Maybe not enough time for all .
Going with fixed 200 gr 32-40  14.3gr  4227 . A bit of 40-65 for my buddy in various loads of 4895 ( I  have plenty of it ) .Some of the 4759 on lighter fixed 280gr and 360gr cast slugs  . 

A little off hand .... mostly off the bench .. indoor 100 yd . 

Well the 32-40 loads pretty much stayed at 2" with some minor key-holing with tapered 200 gr fixed loads . I may run some of my of 165 gr bullets and add a few grains . 

My buddy's 40 - 65 C sharp was at 3 - 4" with mixed loads ,some GC bullets with dried hard lube . The trigger is heavy and the new ladder sight shot high even when bottomed out . We could not get a good rest height with my old Hart front bench rest end up with range rests /boxes and lumber . 

I used some old 50ft pistol target , that was hard to see the 5" black even with the widest aperture at 100 yds . Need to get a few proper targets to match the front sight . 

Both barrels ended up clean , no leading or schmutz .

Yes , I'm pretty close to where I was in the 80 - 90s with those loads . More or less sorting through inherited supplies picking a good combo . While there is BS gear and I shoot mostly fixed loads , so thats another time VS benefit test . 

I do have a note book for range results , hoping for a good enough load so every trip to the range isn't square one testing .