Not recommending this, just relating what I found. The .45-70 is a famous old load that was frequently used for the American bison. There are still some very old .45-70's around. I think they may be called "trapdoors" or something like that. The old guns are not recommended for modern higher velocity loads.

The cases are quite large and will easily accommodate much more than the 70 grains of powder that created the .45-70 moniker. This is called pressure packing in reloading circles.....if the bullet packs the powder as the bullet is seated. Being experimental with a solid, robust single shot .45-70 rifle, I created some loads that were downright fearsome. Managed to put some .45 lead bullets through 1/4" of steel plate. My .308 loads hardly dented that particular steel plate.

Do not do this unless you believe you are qualified and you have a robust single shot rifle such as the Ruger .45-70 for example.

Great brush load I think. Certainly leaves a large hole. I wish I would have hung unto mine.

Do not exceed manufacturer recommendations unless you are OK with possibly significant risk.