wanted trapdoor smokless hunting load

HI all, I am looking to get some smokeless load data for the original Springfield trapdoor rifle. Loads need to be deer killers at about 100 yds and use a light boollet.
I have a lot of experience casting and shooting the trapdoor, but it is all with Black and using heavy long range boolits. This is for a buddy who will not shoot Black and insists that a 300 grain boolit is the best. I have several boolits in that size, and will most likely use the RanchDog 460350, cast soft. I have 4895 and 4198 on hand, but willing to buy more powder if results justify. Primers will be REM 9 1/2. Brass REM 45-70.
I am just looking for some up to the minute data, what guys used last year in the real world, not a manual load.
gun has not been field tested yet, but there's plenty o time
fwiw - this guy is a retrd army kernal, so I can't tell him anything he don't already know (lol) I am not telling him about my oversized 45acp mold that drop around 200 grns
thanks a bunch

Have used 39-41 grains of IMR 3031 in a trapdoor at 38 grains it didn't have a complete burn on the powder and had powder in the bore.

I use 36 gr 4895 with a 1 gr Dacron filler under a 400 gr 457124 for 1391 fps and a measured 22,400 psi in my TD. I suggest that as a starting load with the 350 gr RD cast of 16-1 alloy and work up to 40 gr. That will be under the SAAMI MAP for TDs. A good load should be found in there to satisfy the Colonel.

Larry Gibson

36 grains of 3031, a 405 gr. cast boolit, chronos 1275 fps out of my 1884. This is using a standard primer and Remington brass.

If you can find any, 40 grains of RL7 worked well for me in my original 1884 Trapdoor giving 1600 fps with the Ideal #457122HP cast 1:30 tin/lead and brought home the venison on numerous occasions. This is a starting load in the Lyman Cast Bullet Handbook 4th Edition (2010) in the Trapdoor section.

Best boolit ever is the Rapine 500 gr Gov't with 3031 but good luck finding a mold since Ray retired. Shot to the sights with tiny groups. 4198 would hit very high and kick your teeth loose, bruise your cheek. I have the Rapine mold at .460" and my friend killed many deer with it cast 1 to 20. Sorry I don't have the load as he took it with him when he moved.
The heavy boolit had good powder burn. Never got a 405 to shoot.