Home Forums Reloading Big Game Rifles 300 WBY loads

Old Wby catalogs had data with pressures for IMR-4350, 4831 (the surplus data powder Jack used), and N-205. The data was plenty close enough to factory.

IMR-7828 has the slower 4831 (surplus data powder) burn rate that IMR-4831 and later Hodgdon 4831 lack. Newer powders can do about the same, but IMR-7828 is a no-brainer.

It drives 200 gr NPs to 2975 from 24" barrels......not exactly slackin'.

300 Weatherby Remington 700 Classic 200 grain Nosler Partition, Primer 215, 78.2 grains of RE 26,-- 0.66 MOA -- three groups of four shots average

There ain’t nothing that’ll stand up to that. Excellent load.

while I download much of my ammo, more tailored to fitting the game and the distance it'll be shot out..

But I figure if you are needing a magnum, you might as well make it a magnum...

so 83 grains of H1000, with a 220 grain Partition or a good old 220 gr RN, either Sierra or Hornady...

even at 300 yds, when I've shot a steel target at 300 yds at our local range.... the 'clang' is loud enough, that it gets the attention of the other shooters at the benches.

The few times its been used on bigger game, it drops them on the spot...

its pretty darn accurate also....

Shot a 3/4” group with my dads 300 wby today, 168 TTSX on top of 84 grains on RL 19.

83 gr R22 under a 168 TTSX for 3270 FPS.

One of my hunting buddies who doesn't reload needed a light, no lead load for our small California deer. The rifle is a Japanese made Weatherby MK5 "lightweight" w/ a 22" barrel (I know; why?). After some testing, the best load was a 150TSX, 81.5 gr. H4831SC, FED215, Remington case @ ~3100fps. This is the starting load from the Barnes #4 manual. So far it's accounted for 3 bucks, all were dead right there. No bullets recovered. He is thrilled with this combo now. Shoots about a 1.25-1.5", 3 shot group and consistently holds zero after some bedding work and installing Talley LW rings.-Mark&Belle

Several years ago I did a little reloading for Robert Kleinguenther. I would think he would know a little about wby cartridges. He liked 7828 with 180 Hornady flat base bullets. Hasbeen

RL22 or 7828 and 200 partitions or 180TSX

Nasty on anything.

84 gr R22 under a 168 TTSX gets around 3270 FPS in my M70 classic.

I use RL-26 in Wby cases, 215M primer, 168 TTSX at 3,300 fps. Shoots under an inch. I used MagPro with good results at 3,320 fps but the RL-26 tightened the groups up a bit and lost about 20 fps.