Load data: Sierra matchking 125 gr

[HkUSP45]

I picked up a box of Sierra matchking 2121 125gr to reload for 300blk. I decided to not build a 300blk upper.
What load data could I use? Powder I have are IMR4064 and 4007SSC(not affected by recall).
Thanks

[OpenSightsOnly]

Do you have any other .308 rifles?

[ar15barrels]

I picked up a box of Sierra matchking 2121 125gr to reload for 300blk. I decided to not build a 300blk upper.
What load data could I use? Powder I have are IMR4064 and 4007SSC(not affected by recall).
Thanks

Use the load data for the cartridge you intend to load them into.