Best powder and loads for 7.5x53.5

[Springfield 1873]

Hi, I know that I shouldn't be asking for loads on the internet but I'm still looking for a safe load for 7.5x53.5 for my WF Bern m1889

I have loaded 1 round with 70 grains of goex 3FFFG with a 150 grains lead cast bullet out of a lee mold with a COL of 2.267. Is this safe as 7.5x53.5 is a bottlenecked cartridge?

I am using regular 7.5x55 swiss casings as my m1889 will accept those casings without issues

I have Herter's 150 grain jacketed bullets. They are kinda like the hornady interlock SP

The powders that I have on hand are IMR3031, benchmark and Varget but I could probably get some H335 or bl-c2. I really like bl-c2 for standard 7.5x55 (GP-90) loads

I am thinking of using minimum 30-30 or 30-40 krag loads, which would you guys recommend?

What loads do you guys use?

Yes, yes, I know that I shouldn't ask for load data on the internet but I'm just trying to get an idea

[Adam Helmer]

Springfield,
Wow! I never used BP in any of my Swiss arms. Whatever. I suggest you get a few current reloading manuals and be guided accordingly. Let your rifle "tell" you the best load. Good shooting and welcome to the Forum.

Adam

[K43]

Get the Hornady Handbook of Cartridge Reloading. It comes in digital and hardcover.
The starting loads for 7.5x55 are very mild and will give you a safe place to start with powders you have. The lower loads at 2200 fps to 2400 fps with the components you have show good accuracy. These loads may be what you are looking for.
Hornady groups bullets by weight, not design, and sometimes this is criticized because the data is mild for the worst case bullet they tested. This is good for those seeking the mild end.

[P Flados]

I think you are asking about loads for the round known as 7.5 x 53.5 R Rubin, I have seen it listed as black powder only. Quickload has it with a much smaller case capacity (33.0 gr water for a 2.010" long case) than the 7.5 x 53.5 GP90/03 Swiss (63 gr water for a 2.188 long case). FYI, the above info seems goofy to me since you seem to have the Rubin gun but say you can use the Swiss case.

Low pressure smokeless loads can probably be worked up for a Rubin gun, but this would need to be done very carefully and I am not sure about some of the details.

If you are asking about a gun that is safe for 7.5 x 53.5 GP90/03 Swiss loads, typical smokeless loads are more appropriate.

I like helping folks with loads for oddball stuff. Quickload is not as good as actual load data, but sometimes load data is just not available for specific combinations.

For Quickload to be most useful, inputs needed include: Bullet weight, Bullet length, COAL, Powder(s), Desired power level (or pressure), barrel length. Case capacity is sometimes needed.

[Abert Rim]

Lots of data and links here, including technical descriptions of all the Swiss military cartridges.

http://www.swissrifles.com/ammo/#5.6

[K43]

None of the recipes in the Swiss Rifles website are listed as being for pre-1911 rifles.

[shoe303]

The 7.5 X 53.5 is not a blackpowder cartridge. The original GP90 cartridge used powder that was described as "semi-smokeless". This just means it was not as smoke free as some of the other powders of the time. Loading data for the .30-40 Krag is a good reference. IMR 4350 is a good powder for use with the heavier bullets like the 220 grain .30 caliber bullets. The throats on 1889 Schmidt Rubens tend to be rather long so seat bullets to match for best accuracy.