.257 wby mag loads with IMR 7828

Bigbubba

Bigbubba

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I have some 7828 I want to use for 100 grain Sierra game king bullets in my .257 wby mag. The only load i can find for this is 73 grains which is the maximum load.

Anyone have any experience with this load at this caliber?

I was thinking of starting about 10% less and working up from there but was wondering why there is no starting load listed just the max load?

Thanks
 
I used IMR7828 with 120gr Partitions and it worked well. I am not sure why they don't have a starting load.
 
I just tried 72.0 grains with my Vanguard S2 this evening. Tried 100 TTSX, TSX and Hornady SP's. I got sticky cases with the Barnes and feel that I would back down one grain. Velocities are over 3600 fps. The TSX worked great but the TTSX don't like this rifle.

The Hornady could use more powder but I was getting 3500 fps and fantastic accuracy for I am staying with this load for coyotes.

Steve
 
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