460 WBY Pressure Question

[cpo223]

I have been using IMR 4350 to load 350 and 500 Grain bullets for my 460 but can not find any right now, but I did find some IMR 4320 but the load data I checked shows a lot more pressure for about the same speed. I guess that is because of a different burn rate, but is there any negative affects to the increased pressure like case life or wear on the rifle? I am probably going to use it since I can not get anything else right now but thought I would ask anyway.

Thanks

 

[sigbusa]

stevespages.com has several load recommends for the 460 using 4320 powder

 

[NCsmitty]

is there any negative affects to the increased pressure like case life or wear on the rifle?

It's certainly possible if you push the envelope with this powder.

IMR4320 is faster burning and can spike pressures quicker. I recommend using the lighter bullets and avoid the 500gr.
What load range were you thinking using IMR4320?

NCsmitty

 

[cpo223]

I was going to try 95 grains for a 500 gr. bullet.

 

[NCsmitty]

cpo223,
I don't have access to any of my manuals right now, and none of the online sites show IMR4320 used with the 500gr bullet.
All I found was a 350gr Barnes with IMR4320 using a starting load of 106gr.

If your manual shows 95gr of 4320 as a starting load, then I guess it should be safe.
You really should use a slower powder with the 500gr.

NCsmitty

 

[cpo223]

Thanks for the help, I have some 350 gr. bullets I can use for now to be safe.

 

[moosehunt]

Wish I lived close to you--I've got a few pounds of IMR 4350 that I would gladly trade you for some IMR 4320, which I can't get.

 

[bfoosh006]

FYI,...http://forums.accuratereloading.com/eve

has tons of Big Bore data....