I am asking for your experience in breechseat a 32/40 with blackpowder.
Not wanting to reinvent the wheel I would welcome input on your experience
as to what seems to work and what is a waste of time.  The first tests I used
two type of 3f and one of 2f.  Cases filled to the top and used Walter wad to hold
powder in flush with case.  Bullet seated in barrel flush with case mouth.
   I found out it doesn't like 3f  velocity spread of 200 fps and 4" up down on target. 2f spread of 20 fps and 1.062 group at 100 yds.  I am going to make a new plugged case to seat bullet .062 in front of case and try that.
   Any suggestions of where to go from here?  Anybody try compressing the 
powder like used in 45/70 blackpowder rifle cartridges?
   I am wiping between shots to clean out fouling.  Using Douglas barrel and 
Barnett mold 188g,  .980 long.  Thanks

cheatin_charlie
If your 2F load was a 3-shot group at 100 yds, I would call that promising. If it was a 5-shot group, I would say you are definitely on the right track. If it was a 10-shot group, I would say you have arrived! Your 1.062" group is essentially minute of angle (MOA). Consistent sub-MOA with straight black powder is a pretty elusive goal even with ideal range conditions.
As a point of reference, in his 1899 catalog, Harry Pope would guarantee his barrels would shoot 10 shots into 3" at 200 yds for an additional $5 fee. Add another $5 and he would guarantee 10 shot groups of 2 1/2" at 200 yds. That 3" group is approximately 1.5 MOA and 2 1/2" group would be 1.25 MOA. If you can consistently shoot into 1" at 100 yds, I think your accuracy is very good.
Your idea of seating bullets .062 ahead of case mouth is a good idea and may help accuracy. With some rifles, it also helps to use a felt wad to fill that void between the case mouth and bullet base. Just for grins and giggles, you might also try filling the cartridge case through either a 12" or 24" drop tube. Slowly trickle the powder to ensure that each case fills consistently.
Frank's suggestion about using 1F and pistol primers is also good advice. I've had good luck with both Swiss 1F and 1.5F for 32-40.

RSW
I shot 8 shots with my 2f load and 7 made the 1 1/16" group.  The wide shot I
called because the rifle twisted a lot and I called it.  I was resting the round barrel in the front rest and it is a sporting style rifle so it is hard to control.
  I made a 3" wide forearm for it today to ride the bags better and resist twisting
I have just now drop tubed my powder and am anxious to try it again.  Probably
be next week before I can get back out if the weather cooperates.  I am in Ohio
so things can be iffy.  I hope to make a compression die and work with that for
awhile also.  I always shot smokeless in my single shots but this is way fun.
    I used to shoot BPCR with 40-65 and am trying to use what I learned from
that discipline to the 32-40.

Charlie,
frank makes a good point.
absolutely consistent barrel condition from shot to shot is a necessity for consistent bullet placement.
given that your droptubed charges are of consistent column height,your bullets are good, and you hold, aim, and squeeze right, it is ALL about finding the best airgap.
40 and 45 cals seem to like at least 1/8" gap, with smaller calibres liking less. (generally speaking)
going out in 0.010 or 0.020 increments, it will become very obvious when you find a tune.
it is worth going past the tune to find the extremes, and load in the middle.
pistol primers can help, as can a paper wad under the primer in later fine tuning.
also trying 1f and 1.5 f could be of value.
do the yards and reap the rewards.
keep safe,
bruce.

You can "cam" your cartridge into place in about any dropping block action with a 'cartridge seating tool' from Arizona Sharpshooters. I cam my 800/900/1000yd loads into a Hepburn action about 1/8-3/16" using one. Should work just as well with a BS bullet & case, which I plan to try in a couple of weeks. He makes them for all the popular dropping block actions. 

Forgot to mention that I shot my highest 600yd score ever with this same load being cammed into the chamber with the AzS tool. It is some effort to do so. I'm looking forward to shooting again at 200yd and longer distances with a truly BS seated bullet.

Also, I'm surprised that folks are talking about using an 'air gap'. It has always been my understanding that it a possibility to "ring" the barrel if shooting with an air gap.

I thought I would post a picture of my latest targets using blackpowder at 100 yds.  The rifle is a Stevens 44.5 action with Douglas barrel 1" dia 28" long.  Not
a benchrest rifle and I am having trouble controlling recoil consistantly.  But I am learning.  Ignore the small holes they are .22. Target on left shot with rifle
primers. Middle and right shot with pistol primers.  I shot middle target them tried some other combo's and then went back and shot right target same combo
as middle target.  I feel I am getting somewhere just have to keep playing.  Have to cast more bullets to keep shooting.  I am going to shoot some 4227 to
get a baseline with this rifle.  Having fun in Ohio!

John, I do clean between shots and am using the powder I have on hand now.
Rifle didn't like Kik 3f or Olde Eynsford 3f or Goex 1.5f.  Shot best target with
Shutzen 2f.  A friend has Swiss 1.5 for me to try.  I am changing butt stock so I
it can ride the bags better.  I am sharing notes with a friend who knows about
slug guns and a lot of info is interchangable.  Thanks for the interest.
By the way I am getting 19 to 20 fps E.S. for 5 shot group.
Charlie