I've purchased some Barnes Triple X 200grn bullets that I need some load data for the 300 RUM. I've got RL25, Retumbo, & IMR 7828 powders available. Can anyone recommend any loads for this combo?

Thanks.

Retumbo From 79.3 grains to 96.0 grains
Remington 9-1/2M Primer

RL-25 From 76.0 grains to 92.0 grains
Federal 215 Primer

IMR-7828 From 75.0 grains to 89.0 grains
Federal 215 Primer

I have the 300 Weatherby, 26 inch barrel. My goal was 200 grain Barnes TSX at 3000 fps across the Chrony. All Fed 215 primers

IMR 7828: 83.0 grains
H1000: 87.0 grains
Both above gave me 1 inch groups at 100 yds

With 200g Sierra

REL 25: 86.0 grains

Retumbo: 87.0 grains

I did not get good groups with REL 25 and Retumbo with my rifle. I got almost a shotgun pattern with REL 22, but with in the 2506 Sendero I get on ragged hole with 10 shots at 100 yards with REL 22. Guns and powder can do strange things

Hope this helps for starters.