started working with my 7mmx300 weatherby. just got a set of rcbs dies and loaded my first load for the crony. 73 grs imr 4831 and a 162 edl-x, 3159.

[eastbank]

rifle(very heavy) is a custom single shot 98 mauser action with a ss 30" barrel , my first load with imr 4831 was 73 grs and a 162 edl-x, it cronied 3159 fps with no signs of pressure. cases are federal 300 weatherby once fired. i want to find the best load with different powders-bullets.

 

[257Tony]

4831 seems too fast for that large of a case. You've got more case capacity than a 28 Nosler, and it generally likes powders in the H1000/Retumbo/R33/N570 range for the 160+ bullet weight.

Those speeds are also quite a bit slower than I'd expect with that much case and a 30" barrel. I'd guess you should be seeing close to 3300 with a top load.

 

[eastbank]

i wanted to start low at 73 grs 4831 and work up, i have H-1000 and retumbo and will try it too. 3159 fps is not to shabby to start with.

 

[Longrangers]

I have one and shot it in matches. Ran h1000 180 grain Berger's. Shot well used fed primers

 

[jjmp]

Sounds interesting what's your twist played with one 300 bee and two Stw's , that's nice first speed and a great Powder , your gonna have a rim 2 rim shooter , thks and keep us posted

 

[Rich Coyle]

I ran IMR7828 in my 7-.300 Weatherby. I gained at least 100 feet per second over H4831.

 

[eastbank]

what load did you start with useing imr 7828 and the 162 gr edl bullet? thanks

 

[Rich Coyle]

Sorry, I didn't use 162 grain bullets. I used 150 bullets and 85 grains of 7828 for a velocity of 3, 525 feet per second. For 175 grainers I used H870.

 

[rellison312]

4831 seems too fast for that large of a case. You've got more case capacity than a 28 Nosler, and it generally likes powders in the H1000/Retumbo/R33/N570 range for the 160+ bullet weight.

Those speeds are also quite a bit slower than I'd expect with that much case and a 30" barrel. I'd guess you should be seeing close to 3300 with a top load.

Agreed, I'm getting 3193 fps shooting 180 Barnes from a 24" bartlein.