I was wondering what the max weight is for this cartridge. My rifle has a slow twist so it does not stabilize the longer bullets. Factory loads used 260grn bullets, which I use now. but I would like to go alittle heavier. There is already a mold I can order on Accurate molds. It is 300grn.
I have multiple articles on the caliber and the most people have went is 310 grns with good accuracy from what I can see. The bullet needs to stay under an inch in length to stabilize.
The rifle is an original 1886 MFG 1889.