Armi Sports Spencer 56-50 smokeless reloading data

[thespaniard]

I am brand new to this and looking for some reloading data:

The gun is the Taylor Spencer Carbine in 56-50 made by Armi Sports
Bullet I have is 350 grain Montana Bullet for the Smokeless Powder

Brass - Starline brass

Powder I have in stock considering it's such a pain to get reloading supplies nowadays
Win 231 and IMR 4198 and one small bottle of Trail Boss

Primer - Winchester Large Rifle

Doing some research I found out that if I take the 90% load data of a 45LC 250 Grain Lead Bullet that should be get me close.

Any help or guidance would be appreciated  I did some earlier research and read some of the earlier postings but couldn't get a definitive answer to my current reloading setup.

[Sedalia Dave]

I am using 23.5 grains of IMR 4227. Out of all the smokeless loads tried that was the most accurate.

A compressed load of FFg Real BP was also very accurate.

Here is a post with more info.
https://www.cascity.com/forumhall/index.php?topic=62084.0

[mgmradio]

I use 8.5 grains of Unique in my original Spencer's. Muzzle velocity matches the original black powder specs. Very accurate and I have shot thousands of rounds.

[thespaniard]

Thanks to both of y'all , I was able to get 2 small powder IMR 4227 as they are limited from MidwayUSA and I will use the 23.5 data, I am not a BP shooter only shot BP in Cap and Ball revolvers.

But I am planning to venture to the Dark Side once I get a tad of grip on my reloading and shooting the Spencer 

[barkerwc4362]

I use the 23.5 grain IMR4227 load in Starline brass, Wolfe Large Rifle Magnum primers.  I have the RCBS 50-350 CM bullet mold.  It works fine.  Very accurate considering the crude sights.
Bill