338-378 weatherby looking for 300 grain data

[dgr416]

I just got a bunch of 300 grain lapua and 300 grain serria bullets .I usually use reloaded 25'.Its been 15 years ago when I loaded any 300 grain bullets for my 338-378 Weatherby .I use 109 grains for my 250 grain nosler partitions .I think I used 98 or 100 grains of r25 for the 300 grain .I also have a bunch of wc867 powder that I bought to use in this gun .Its a accumark Weatherby with factory barrel .I hope one day to build a 30 inch barreled accumark to get more out if tho cartridge.

 

[Tyrel08]

im currently shooting 300 grain bergers out of my weatherby.
using hodgdon h50bmg. start at 109gr and work up to 114.5 coal 3.96
my bullets are a little long to fit in the belly so it only works as a single shot for me but i am sure you would be able to shorten the overall length up enough to fit it in.
also try using a couple different primers to get the best shot. i would have to take a look i believe i am using the federal 215h primers

 

[Trnelson]

Here is what Norma recommends...
https://www.norma.cc/en/Ammunition-Academy/Loading-Data/338-378-Weatherby-Magnum/
Have fun!

 

[Scratch]

I would look into using RL-33 in any off the .338 Calibers.

 

[streaky]

H 1000 or Vit n570 works well for me

 

[338edge]

H 1000 or Vit n570 works well for me

H-1000 & Retumbo for me.

 

[dgr416]

I bought a bunch of wc867 powder to use in my 264 and my 338-378 .Its so temperature variable I am.almost afraid to use it in my 338-378 .It does ok in.my 264 but can't shoot it above 80 degrees without pressure .I.need to try some of y h870 in it just know its a dirty powder .I have powder fouling with r25 .I have to totally clean my barrel every 50 shots or it shoots like a shotgun.I have shot under an inch at 300 yards with r25 and 250 grain nosler partitions.

 

[highridge1]

Rl33 gave me the best results I have ever seen in the 338-378 with 300 gr