Working up a load..

[Randy Bohannon]

What I do, is the new rifle from the same maker and same chambering you have been reloading for ? I have a new 1877 Shiloh showing up soon in 45-70 and planning to start load development using what worked in my 1874 45-70 given both chambers will be close to the same.
New cartridge with everything new to me I seek what others have done with the same and find a starting point, bullet, shape size powder/charge weight. Somebody somewhere has done what you’re trying to do with what you are working with and with success.
I can’t imagine to many cartridges that the likes of Wasserberger, Mc Dowell,Beltfed, JimK ,Kurt and bunch of other guys have done extensive work with that are viable and they freely share their knowledge.
I have no interest reinventing the wheel and seek the fastest potential to get things right the first time. Follow the winners they have much to learn from.