338-378wby load data

[Tyrel08]

Hey I am new to reloading and I just bought myself a 338-378 why mag and I am just wondering if anyone on here has any info for load data for this caliber? Thanks in advance any help would be appreciated.

 

[Jokostel]

Are you familiar with firearms prior to this?
What exactly do you expect out of your rifle?
What are you wanting to do with it?
Specs?
What do you have for it currently?
Do you have ANY equipment thus far?
We need more info from you to help you properly.

 

[Wachsmann]

Here is where I would start. Also try reloaders nest for some loads but be carful and work up. Below was all 300 grain bullets off of hodgdon's web site

Manufacturer
Powder
Bullet Diam.
C.O.L. C.O.L.: Cartridge Overall Length


Grs.
Vel. (ft/s) Velocity: The speed of the bullet in flight.

Pressure Pressure: The force exerted by burning powder measured in Copper Units of Pressure (CUP) or Pounds per Square Inch (PSI).


Grs. Grains: If the value is followed by a C, it denotes a compressed load.

Vel. (ft/s) Velocity: The speed of the bullet in flight.

Pressure Pressure: The force exerted by burning powder measured in Copper Units of Pressure (CUP) or Pounds per Square Inch (PSI).

300 GR. SIE HPBT
Manufacturer Hodgdon
Powder US 869
Bullet Diameter .338"
C.O.L. 3.750"
Starting Load
Grains 108.0
Velocity (ft/s) 2,598
Pressure 41,800 CUP
Maximum Load
Grains 115.0
Velocity (ft/s) 2,782
Pressure 48,700 CUP


300 GR. SIE HPBT
Manufacturer Hodgdon
Powder Retumbo
Bullet Diameter .338"
C.O.L. 3.750"
Starting Load
Grains 100.0
Velocity (ft/s) 2,604
Pressure 41,900 CUP
Maximum Load
Grains 106.5
Velocity (ft/s) 2,818
Pressure 53,000 CUP

Barrel Length: 26"
Case: Weatherby
Primer: Federal 215M, Large Rifle Magnum Match
Trim Length: 2.903"
Twist: 1:10"

300 GR. SIE HPBT
Manufacturer Hodgdon
Powder H1000
Bullet Diameter .338"
C.O.L. 3.750"
Starting Load
Grains 92.0
Velocity (ft/s) 2,506
Pressure 41,300 CUP
Maximum Load
Grains 101.5
Velocity (ft/s) 2,747
Pressure 54,000 CUP

Barrel Length: 26"
Case: Weatherby
Primer: Federal 215M, Large Rifle Magnum Match
Trim Length: 2.903"
Twist: 1:10"

300 GR. SIE HPBT
Manufacturer Hodgdon
Powder H4831
Bullet Diameter .338"
C.O.L. 3.750"
Starting Load
Grains 89.0
Velocity (ft/s) 2,596
Pressure 48,800 CUP
Maximum Load
Grains 95.0
Velocity (ft/s) 2,718
Pressure 54,000 CUP

Barrel Length: 26"
Case: Weatherby
Primer: Federal 215M, Large Rifle Magnum Match
Trim Length: 2.903"
Twist: 1:10"



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[Tyrel08]

Are you familiar with firearms prior to this?
What exactly do you expect out of your rifle?
What are you wanting to do with it?
Specs?
What do you have for it currently?
Do you have ANY equipment thus far?
We need more info from you to help you properly.

I am but I've never done reloading, I just can't bring myself to spending 240 a case haha and the factory isn't giving groupings I am happy with.
I have all rcbs loading equipment and I have retumbo powder as well as 300grain Berger lead. I am also getting some eldx lead and h1000.
I am planning on building a good long range hunting load.

 

[Jokostel]

Hornady and Sierra have always been VERY forgiving in ways of tuning a load for various calibers... Except for me, Hornady in 7mm is sometimes fickle.
I would look at the 250 Grain Game King, and the Hornady 285 ELD series.
Bergers, while great, *SOMETIMES* take a bit of work to tune properly...then again, you may get lucky.
(Very sensitive to seating depth)
Retumbo and H1000 are **** good choices... I would also put N560/570 on that list... maybe some RL25 or RL33 as well.

ANY RCBS loading press is a **** solid system. Just make sure you have a level surface to mate it up with and rock it out.

Just pay VERY close attention to deal on your brass preparation and take caution with loading your primers....
What do you have for powder scales? Even IF you want to go digital out of the gate, I HIGHLY recommend you purchase a good old beam n balance scale... those take minimal calibration, and short of you damaging it, it will hold true for a LONG while.

 

[barefooter56]

Hey I am new to reloading and I just bought myself a 338-378 why mag and I am just wondering if anyone on here has any info for load data for this caliber? Thanks in advance any help would be appreciated.

Tyrel08,
Shoot us an email at [email protected] and we can help you with load data.
Take care,