300 RUM 215 berger

[Elkhunter2007]

Just got some 215 and going to start load development with ADG brass and Retumbo powder I've been shooting the 212 eldx with 91.0 gr of Retumbo with great results I have a custom 300 rum with a carbon six barrel where would a good place to start for this setup . the 212 we're running 3118 fps average Velocity with Velocity Standard deviation in the single digits I'm hoping to continue that with the 215 s as well

 

[RockyMtnMT]

Back off a couple grains from your current load and work up from there.

 

[Tiny Tim]

Tagging in

 

[Rhovee]

Honestly those bullets are lose enough that I would try 91 grains and then maybe .3 more and .3 less. I have shot the same charge with 210 VLD and 215 hybrids before and both were accurate. The 215 might go a touch faster due to bearing surface difference.