Hey guys,

It's my first time loading Weatherby Magnum and, know there are some things to look for with the rounded shoulder and, am trying to develope a hunting load for the 300 Weatherby magnum in a 180 barnes bullet. Anybody done this that has any tips or suggestions. I am not the shooter, prefer a little less gun for my hunts unless dangerous game however, a friend likes the power so, am helping him out.

Which 180gr bullet? The data varies between the regular X, the XLC (coated), and the triple shock.

The regular Barnex X FB 180 grain .308 bullet. I don't load boat tails on the weatherby due to votex and barrel harmonics on that heavy load in a sporter barrel.

BT's work just fine. 180 grainers are 180 grainers...pick your powder. RL22 is the classic choice. 4350, 7828, H1000 all work well...and go from there. It's a great round and great rifle. Kills critters real good.

Barnes #3
.300 Weatherby Magnum
Weatherby Brass
Federal Gold Medal 215M primers
24" test barrel

180gr XFB
180gr XBT

XMR 4350* 70.0grs 2809-75.0grs 3010fps
XMR 3100 76.0grs 2818-81.0grs 3003fps
RL19 76.0grs 2913-81.0grs 3105fps
RL22* 78.0grs 2929-83.0grs 3117fps
H4350* 70.0grs 2814-75.0grs 3015fps
H450 74.0grs 2829-79.0grs 3020fps
H4831 75.0grs 2838-80.0grs 3027fps
H1000 82.0grs 2882-87.0grs 3058fps
IMR4350* 71.0grs 2839-76.0grs 3046fps
IMR4831* 72.0grs 2839-77.0grs 3036fps
IMR7828 78.0grs 2895-83.0grs 3081fps
Norma204 74.0grs 2834-79.0grs 3026fps
MRP 77.0grs 2958-82.0grs 3150fps
VIT N160 73.0grs 2796-78.0grs 2988fps
VIT N165 81.5grs 2849-86.5grs 3024fps
WIN WMR 78.0grs 2887-83.0grs 3072fps

*Recommended powder per manual

I shoot a .340 which is the same casing with a .338 bullet. I've had good results with RL22, IMR7828, and both 4350's

RL22 appears to pretty temperature sensitive as far as velocity goes. I observed a loss of nearly 150fps between 90 degrees and 35 degrees. I had read about that issue and decided to see for myself and it appears, from my limited testing, to be the case.

I have not shot any of this data, nor does spell check work for loading data...use it at your own risk.