Looking for 45-70 subsonic recipe

[SdotW]

Hello,

I purchased a 1895 Marlin Trapper and I'm looking for a subsonic recipe. I currently have the following items.

• cci Large Rifle Primers no. 200
• Starline 45-70 brass
• 405 grain polycoated bullets
• IMR 4198

Does anyone know how many grains of the IMR 4198 to make this subsonic out of a 16" barrel?

Additionally, will I have to fill the 45-70 case up with something to fill the empty space because of the reduced powder load?

 

[fpgt72]

I can't help you too much. My 45-70 is a trapdoor so I search for loads with a very low CUP numbers, low teens if possible. I use a missouri bullet 405 and have had great luck with those.

My load is quite subsonic, and I found it over on loaddata.com. It is not that expensive and suggest taking a look at it, it is a great resource for old and outdated cartridges. Mine is a VV powder that gives me low 900fps numbers and a 13k CUP (IIRC).

Give that site a check out, I think you will find what you are looking for. IIRC it is like $30 for a year.

 

[HOOFER]

Hello,

I purchased a 1895 Marlin Trapper and I'm looking for a subsonic recipe. I currently have the following items.

• cci Large Rifle Primers no. 200
• Starline 45-70 brass
• 405 grain polycoated bullets
• IMR 4198

Does anyone know how many grains of the IMR 4198 to make this subsonic out of a 16" barrel?

Additionally, will I have to fill the 45-70 case up with something to fill the empty space because of the reduced powder

I would be cautious as that powder won’t give much case fill. Lots of guys are using wads for that type of thing.

I’d run a heavier bullet. Not sure if Hornady will publish its load data for its SUBx bullet. I doubt it.

 

[SdotW]

I'll probably have to go to a 500 grain bullet and change powders.

 

[chutinlead]

Lyman has a cast bullet reloading manual with trapdoor loads for imr 4198 that are subsonic. Another good powder for reduced loads is 5744.

 

[paulrem308]

Looking at hodgdon website. Looks like trailboss is the ticket. Let us know how it works out and what can you are using. I really want to know

 

[Huskydriver]

Trail boss big heavy bullet

 

[SdotW]

It's definitely looking like Trail Boss will be a solid choice. I'll just use this IMR 4198 for supers.

 

[redbullitt]

Agreed with above posts. Trailboss may be the easiest way. May not even have to go super heavy on the bullet. Wont know for sure until you chrono a few.

I have used unique and trail boss with success from a 16 inch barreled encore. You may have to be careful if your pressure ceiling is for a trapdoor.

Lever Gun Performance Studies

Reloading Data for cast bullets, result of lever gun accuracy studies on cartridges: 357 Magnum, 41 Rem Mag, 44 S&W, 44 Russian, 44 Magnum, 444 Marlin, 45-70 Goverment, Pistol Powders, Large Capacity Rifle Cases

gmdr.com

Those guys have some helpful info for loading weird stuff lol.

 

[Bandit320]

Lyman #45.