257 Roberts AI with Ramshot big GAME

[Philly]

Wondering if anyone loads Big Game in their 257 Bob Ackley? Hard to find much info and I have some I'd like to try. Thanks!

 

[std7mag]

The standard 257 Roberts does well with a slower burning powder than Big Game.
Hodgden Hybrid 100V gives me best velocity and accuracy for 100 - 115gr bullets.

My Roberts AI I've been using, Hybrid 100V, RL19 and IMR 4831 for 100-120gr bullets.
The fastest burning powder I've tried is Vihtavouri N555.
Seems to do pretty decently.

If it were me and I wanted to use Ramshot powder, I'd start with Hunter.
With 115gr and up maybe try Magnum.

 

[Orr89rocz]

Id agree thats likely too fast burning. I use reloder 23 in my regular bob with 110-115’s. Superperformance with 80 gr ttsx monos. Both slower burn rates. Hunter may work.

Had tried H414 which i think is like 760 with 117’s and it did ok. But re23 was better.

 

[SeabeeKen]

I did a lot of testing in mine. I did not test Big Game as it is a bit fast. I found that top accuracy was had with Ramshot Hunter, Reloder 26, N-150, N-550, N-160. Groups varied from .1 - .469 in my rifle.
I used both Barnes and Hammer bullets in my testing.
The rifle is my favorite hunting rifle among all my others