338 rum and 300 grain bullets

[JamesWilson5]

Looking for a Lil help . Got a custom 338 rum 28 inch barrel. What would be a good powder to get max velocity with a 300 grain accubond. I'm pushing a 270 eldx at 2984 fps right now with reloader 25 . What could I expect out of a 300 grain and a better powder choice. Thanks in advance

 

[WildBillG]

I got 2888 with Rl33 and a 300 Berger. My barrel was 30 inch. But that was not max either.
2845 with Vihtaviuri N570. You might also try N568.

 

[JamesWilson5]

OK that sounds good thanks

 

[ARlife4me]

I don't have the rum, but lm instead. 570 will yield the most velocity, but might lack the accuracy? 33 if you can find it will be a good choice for 2nd. 165 and 170 are good for case fill, but will be 100-150fps slower ar max psi. Retumbo might be 3rd choice?