Loading the 300 WBY Magnum, what would you do?

[FEENIX]

you may want to check the twist on that barrel the older weatherby rifles were slow twisted

Its a 1972 model...

 

[gator378]

I'd still check the twist, though likely 1:10.
RL-25 is likely your best bet.

Nosler Load Data

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Or Retumbo and or IMR 7828

 

[HappyGVM]

Lots of good advice. Mine is a late 1980's vintage Wby 300 from Japan and eats up the 180 gr Siroccos behind 78.6 gr of RL22.

 

[ofbandg]

I had an old German model and it loved 180 Partitions. I can't help you with powders because they don't make H870 anymore.

 

[DoneNOut]

Thanks everyone! This is going to be an adventure! Might just drop down to 168 Amax. He hunts MI deer and bear.

 

[Lenny Foffa]

Weatherby Customer service is always very helpful. Older German Rifles generally had a 12 twist. I find H 4831 to be a very useful powder, but in these posts I have read much about using H1000. RL 25 and RL 26 . I used to have a target load just for the shooting range of 76.2 grns of H 4831 with the old Sierra GK in 180 Grn. Fed 215 M Primers . It only generated about 2800 fps from the 26 inch barrel. Fun to shoot. You could take that load up to 80 grns for a powerful elk load, if you wanted too. That would give you 3000 fps from a 26 inch BBL. The old Hornady book Vol. 2 ( page 249 ) had H 4831 loads to 82.9 grns for that bullet weight. I never went that hot .

 

[pony doctor]

Friend of mine inherited his uncle's cherry condition (maybe shot 12-15rnds) Weatherby MK V with original German scope, 300 WBY and wants me to load for it. SO, I could be all boring and research my manuals and such, but I'd rather see what you all recommend.

Brass: Weatherby 300WBY (new)
Bullet: 200gr ELD-X
Powders: H1000, AA4350, N570, RL-25
Primers: Fed 215 and WLRM

Factory 200gr ELD-X cartridge showed 75.2gr of an extruded powder. Who knows what, but the grain weight used gives an idea of burn rate.

So, lay it on me.

 

[pony doctor]

Friend of mine inherited his uncle's cherry condition (maybe shot 12-15rnds) Weatherby MK V with original German scope, 300 WBY and wants me to load for it. SO, I could be all boring and research my manuals and such, but I'd rather see what you all recommend.

Brass: Weatherby 300WBY (new)
Bullet: 200gr ELD-X
Powders: H1000, AA4350, N570, RL-25
Primers: Fed 215 and WLRM

Factory 200gr ELD-X cartridge showed 75.2gr of an extruded powder. Who knows what, but the grain weight used gives an idea of burn rate.

So, lay it on me.

H1000 and 3240 fps ( max load data shows no signs of excess pressure, but my shoulder sure does!!!) These " beasts" can RECOIL! Best I could get was 1.2 Moa using 200 gr Accubond's. That " wby " freeborn" has it's issues!! If you don't mind a single shot rifle, perhaps one could improve the accuracy with Berger's ?? I seated the accubonds just shy of magazine length.

 

[slikmrc]

Took one of my 300 WBY's out a couple days ago to shoot a group with some ammo that was loaded last September. 200 grain Nosler AB with 84 grains of H1000. Shot a 1.4" group at 287 yards, doesn't look to be getting any neck/bullet weld yet. I've got a few more rounds left to try in a few months.

 

[BPollard]

I also have an older one. I do 180 accu bonds, 200 partitions and 180 triple shocks

 

[roninflag]

i would drop down to 165 -168. but use bonded bullet or a barnes. re-22, re-26. 215 primer.

 

[Knight]

I've got a 300 Weatherby mark V made in Germany1969 and it's 1in 10 twist. Basic twist rate in that Caliber for Weatherby

 

[Knight]

I've got a 300 Weatherby mark V 26 "tube made in Germany in 1969 and it's 1in 10 Twist. The basic twist rate for this caliber from Weatherby is 1 in 10

 

[DoneNOut]

I've got a 300 Weatherby mark V 26 "tube made in Germany in 1969 and it's 1in 10 Twist. The basic twist rate for this caliber from Weatherby is 1 in 10

Welp, I gotta do the cleaning rod test then and see what twist I got.