I tested heavier loads for my 410 grain Money bullet for my .40-65. I have no throat in my barrel and have to compress the powder to increase velocities. I am unable to push the bullet further down the barrel.

I tested Swiss FFFg powder loads with .230 and .310 compression under 15 km/hr. winds gusting to 20 km/hr.

300 yard group size (width by elevation)with .230 Compression:

52.7 grains Swiss FFFg: 5 7/8" x 5 1/8"
52.8 grains Swiss FFFg: 5 3/8" x 4"
52.9 grains Swiss FFFg: 6 1/2" x 7 3/4" 

300 yard group size (width by elevation)with .310 Compression:

55.7 grains Swiss FFFg: 11 1/2" x 14 1/4"
55.8 grains Swiss FFFg: 9 3/8" x 5 7/8"
55.9 grains Swiss FFFg: 8 3/4" x 9 1/2" 

Groups opened up considerably when I compressed Swiss FFFg too much.

Yes I am getting 1 MOA (ten shot groups) with lower compression (.170) of Swiss FFFg (out to 300 yards). 

However my Money bullet is going to sleep at the Rams.

I am stuffing more powder into my .40-65 to increase the velocity and get it to stabilize out to the Rams.

There is no throat in my barrel and I cannot push my bullet any further down the barrel. 
Only way to get more powder in is to compress it in the case (or custom build a bullet with narrower driving bands or else throat the barrel).

Trying the cheapest solutions first.

Also my barrel's bore is not the standard .400.
It is a narrower .398 and to use standard bullets I need to lever them into the chamber.
My narrow Money nose will chamber. However I cannot push them any further out of the case.

Dave, you might want to look at the Buffalo Arms money bullet with three reduced driving bands.  I've been using the Saeco #740 bullet as it's more accurate but might switch to the money bullet for the rams.  I can get 68-69gr of Goex FFFg Express under that bullet without a lot of compression.  

If you like I can mail you a few as you are also north of the border.

Chris.

Am using the BACo 400gr M4 & 420gr M4 (though it casts at 412gr for me) Money bullets and am using 4x0.060" wads and 3x0.060" wads, respectively, to get them out far enough to get into the lands. They might work well in your 'no-leade' chamber. Use as much as 66gr of 2F Swiss with ~0.010" compression and excellent accuracy. I load them just a bit long and use one of Arizona Sharpshooters' cartridge seating tools when loading as the Hepburn has no camming action. With the High Wall did not need to use the seating tool.

I already had a custom bullet built with a .397 nose to fit my tight bore.

However my driving bands are over .400 and cannot go into the bore.

I would need to build another custom bullet with the first and second band only being .397 to fit my tight bore if I want to add powder without compressing too much.

In two weeks I will test further at a BPCR match. Slightly reducing accuracy to 2 MOA with .230 compression seems to be working on the Rams. 
It appears I have increased velocity enough that it is stabilizing the bullet at the Rams.

I tried it once so far and got 9 Rams in a row. 

Using 50 grains powder or going to 56 grains with .310 compression and I was only getting two Rams. 
I think I may have resolved the long distance stability of the Money bullet by increasing the powder to 53 grains and still maintain accuracy by keeping compression down to .230.

I found I could not compress Swiss FFFg too much (over .250 compression) before the groups would start to open up considerably.

So maybe I don't have to build another custom mould.

With the .40-65 I have not had any problems with hard fouling or muzzle bounce. I am only using two third the powder you were using in the .45. 
With arthritis I have moved away from the .45-70 and am trying to find lower recoil alternatives.

My shooting partner hit a Ram absolutely dead center at the last shoot with his .40-65.

It never budged and it was not pinned.

We were complaining about the .40 calibers but the guy beside us hit a Ram with his .45-90 and it never moved.

Guess the wind from behind was a balancing force.

Some days it doesn't matter what you take to the range.

Barrel is a Shiloh Sharps.