Starting Load for 280 AI ~ 180 gr. Sierra Matchking Bullets

[PA Plumber]

Have looked through a few reloading manuals and dug around a little on-line.
Not seeing much for a starting load using the Matchking 180 grainers.
I have a few to burn, want to season some new brass with light loads, and get some range time getting used to a new to me gun.
I have a few loaded up with 48 grains and a few with 49 grains of 4831SC. Not looking for speed, looking for low end safe.
CCI large rifle primers. New Peterson 280 AI brass ran through a die and cleaned up.
24" Barrel with 1:8 twist.
Thanks.

 

[PA Plumber]

For any that might be wondering.
Just got off the phone with Sierra Tech Support.
Turns out, 48 Grains of 4831SC is the recommended starting charge for the 280 AI with 180 Matchkings.

 

[Dmagna]

I had way better luck with a rl23 and rl26 with the heavy bullets. H4831sc worked really well with the 140 -150 bullets

 

[PA Plumber]

I appreciate the advice.
I have h4350 and h4831sc on the shelf.
Figured I'd start with what's "in stock."
This is tinkering around ammo until the 300 yard target Tiny group disease (TGD) sets in.