Home Forums Reloading Big Game Rifles 375 weatherby mag data

I've been searching an searching
For some reload data and I can't find hardly anything. I would like to use 260gr bullets around 2900+fps.
Any help would be greatly appreciate

Have you looked at Hodgdon's website? They have some data in the low to mid 2800's and given the pressures they show I'm not sure about getting 2900+ without a 26" or longer barrel. But I don't load for the cartridge so that's just me thinking out loud.

I was looking for some data using R15, R17 or anything that
People has come with trial n error.

KyBigGunKy,

Welcome to the 'fire. I have something close to the .375 Wea. It is a .416 Rim Mag necked down to .375 with a 28" barrel. Here are some loads:

Nosler 260, H4350 @ 90.0 = 2,950 feet per second
Barnes 270, H4350 @ 88.0 = 2,870
Barnes 270, IMR4320 @ 83 = 2,950
Barnes TTSX 250, IMR 4320 @ 84 = 3,000

These are maximum working loads with no signs of pressure to me. The 250's generally grouped between 3/8" and 3/4" at 100 yards. The 260's and the 270's were 1 - 1 1/14".


edited to correct Nosler 260 load

That's eleven grains higher than what Hodgdon shows as a 53KCUP top load.

When I bought the gun he gave me 2
Boxes of nosler 260gr ammo and i was trying
To stay close to that as possible
The boxes say 260gr 3000fps
I just wonder if I could use your data
It's s ruger 1

RL-15 would not be my choice for the .375 Wby. The 4350's,4831,RL-19/22 and IMR-7828. With the 4350's being the first I would try.

take something like H4350 , start with max loads for the H&H cartridge and work up with a chrono until you hit 2900 , or pressure signs

the Weatherby will easily make 2900 with 260 gr bullets , I have a M70 chambered to that cartridge , but lost all my data when the old computer died

mathman,



One of my strong points in life is ignorance. I use two criteria when accepting maximum loads. That is, does it work through the action like a factory load and do I get lots of reloads with the brass. With the loads listed I get at least half a dozen or more loadings per case.

But after reviewing the load in red, there is a typo. It should read 90.0 grans for the 260 Nosler load. Thanks for catching it.

That's a lot more reasonable charge. I know rifles are different but eleven grains was stretching it.

WW cases / 78 grains RL-15 / Fed 215 / 250-gr Barnes TTSX / 2825 fps / OAL 3.600" in Brno ZKK 602 (rechambered from H&H.)

50 yds +1"
100 yds + 2 1/12"
200 yards + 2 to 4"
300 yards -0- to -4"

RL-15 gives better results at distance than IMR 4064 or IMR 4320 do, even though they might be faster initially (at the muzzle.)

case weatherby ,primer federal 215,powder R15 78 gr ,bullet nosler 260 AB, oal 3.60

I have an AI which would be close to yours, I suspect.
There's loads on Load data for the bee.
So far I haven't found too much pressure with my AI. I guess I'm happy for that.

Well I'm kinda cheap lol
Especially after trying to buy brass
For this heifer, I think the load data site
Wants 34,00 to sign up im sure it's worth it
But Im still recovering also from the rifles cost
I just thought someone would have a load worked
Up with 260gr accubonds laying around

Okay. IMR 4064 / CCI 250 / 260-grain Accubond / OAL 3.580" / 2650 - 2700 fps / Remington cases. Try it with 78 grains RL-15. (It's rocket science, but not as complicated as all that.)

KyBigGunKy,

If you want to go with a Sierra 300 I used to get 3,000 feet per second with MRP @ 100 grains. When I could no longer find that powder I switched to RL22 and had to back off to 98.0 grains and the velocity dropped off to 2,990 feet per second.

That sounds good using the 300gr
The reason I was trying to use the 260gr
Was I already have two boxes of noslers custom
260gr @ 3000
Thx for that load agazain

Brass Is kinda hard to gone by, it's a little high
But I read where you can shoot 375h&h and Fire form it
But the only draw back ito case compacity is not as much as
Weatherby brass, I don't have a chronograph to check loads

Thx guys for all the load info
All help is greatly appreciated