300 Big Dog is done!

Give US869 a try. I know it's not very temp insensitive, but it worked better than anything I tried. 50bmg was to bulky. Couldn't get enuff in it to peak it out.
 
Your case holds about the same as my 30-378 Weatherby. I had 2-3 round case life in mine and I gave up on hot rodded rounds. But when you are young it's fun!

 
The first barrel was a kreiger 10 twist. It loves the 210s. The second was a lilja, it would not shoot the 210s, but the 190s fit great. 1st shot kills at 910 and 1035 yards in proved that. Mule deer and antelope. This was back before long range was main stream like it is today.
 
My first 30-338 lap imp shot 210 Berger's at 3600 out of a 26" kreiger. I'm very interested in hearing how yours does with the 199 hammers
Is that so? Must be a fast barrel. My 300AX mustered 3400fps with 200's with a 26" barrel. For just over 5100ft lbs to your loads 6,000ft lbs

And my 34" 300Raptor is pushing 245's 3400fps for 6200ft lbs burning 127gr of powder to do it
 
That was many moons and 3 barrels ago on that action. Without goin to dig through my notes, working on memory, it was 119 grains of us869.

The second barrel was lilja and it didn't perform as well as the krieger.
 
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