Does any one else shoot this mammoth, if so do you have any good loads shooting 300 grain Nosler Partition.

Thank

Scratch

http://www.accuratereloading.com/378wby.html

These are from Saeed's reloading section and are quite close to what I got from two previous 378s although Mitch's velocities were a tad higher than what I got and probably because he used Barnes X a lot which would give a little more pressure being further into the case.

Also so try around 85 grains of Varget/4064 which will give 375 H&H top end performance but is still several grains under what can be used with Varget/4064 in the 378.

Mike

Mike375

Thanks for the suggestions, I tried a few loads from Saeed's reloading pages. The best group I can get is 1.5" @ 100 yards (3-shots) however, I've changed primers from Fed-215 to Fed-215 Match to see if that will help.

Scratch

I had a Weatherby version made by Sauer. The only load I tried was the 270 Hornady with 105 grs of 4831. I can still remember that load and the maximum one of 115 grs.

The rifle I had was very accurate with that load but I was afraid of the recoil. Someone wrote that your better off with a larger bore if you need more effect. That was before Nosler started making the 300 gr Partition again and Hagel was not suggesting the 375's for NA because of the lack of premium bullets.

Then a buddy sold me a like new pre 64 M70 in 375 H&H and I sold the 378 asap. Each transaction was $200. That was a long time ago.

To each his own.

Work up to 111 grains of IMR 7828/GM215M primer/Wby case ...

This is a great load in my 25" barreled CZ rechamber with the following 300 grain bullets (the 300 grain Nosler should fall somewhere between these two in velocity most likely):

300 grain Swift AF: 2878 fps/ 0.976" 3-shot@100 yds

300 grain Sierra GameKing: 2813 fps/ 0.675" 3-shot@100yds

For reference, in my rifle, the Weatherby factory 300 grain RNFMJ (looked like old Hornady steel solid) was 2911 fps and the primers gave the appearance of "hot."

Ambient temperature for all the above velocities was 97 degrees F. It was warm.

The Barnes Manual says 108 grains of IMR 7828 is MAX with the 300 grain XFB and gives only 2793 fps in their 26" barrel. They might have got that one right for a switch.

The IMR Manual shows IMR 7828 charge of 118 grains (compressed) as the max load with the 300 grain Hornady RNSP for 3055 fps and 53,500 CUP chamber pressure. Sounds like a definite MAX load to me.

Maybe the new TSX would be better?

Rip

Thanks for the information, I do have some IMR-7828 111.o grains already loaded as you suggested. Just waiting for the right weather (no wind).

Savage99
I did shot 115.0 grains H-4831 behind 270gr Hornaday Spire Point excellant accuracy however, that bullet can't withstand that velocity.

Scratch

Steve,

That's what they say today about the 270 Hornady. Back then they were an accurate and inexpensive bullet.

A primary reason that the 375 and 06 have stayed at the top is their starting velocities are maximum for cup and core bullets on most game. That's why Hagel, who was trying to improve rifle performance, wanted premiums in his cartridges.

Someone had put a funny looking recoil pad on my 378 that looked like the butts of those Arab guns you see in the old movies.