30BR 11.25 twist load help

[Jet]

Looking for a little help on working up some loads for a 30BR with a 11.25 twist 25" barrel. Chamber is cut with to much free bore for the 125 custom bullets so I need to load up Sierra 155 HPBT or longer/heavier.

I'm thinking Varget or RL15 have an acceptable burn rate with this twist and weight. Anyone here have a rifle configured this way?

Thanks in advance for the help.

Jet

 

[jo191145]

I have a 16" ten twist chambered with standard throat. I know, an oddball. The 10 twist shoots amazingly well with 115gn bullets.
Anyhow my guestimate would be more along the burn rate of Benchmark/X-Terminator for your purposes. Theres just not a lot of room for the slower powders.