375hh load data

[Dhutson]

For the .375 I have kept it simple. 71 grains of RL15, CCI 250 primer, and a 270 or 300 grain bullet. Out of my two 375s this has given nice accuracy and velocity. I have my Remington 700 zeroed with 270 grain TSX at 2630 FPS for Alaskan hunting of big bears and moose. For my Mauser 375 I am planning on Buffalo hunting with I plan on using the same powder charge with a 300 grain A-Frame for around 2500 FPS. I havent actually worked this load up yet with this bullet, but have with the 300 grain DGX and was happy with accuracy and velocity. I will start a bit lower with A-Frame, but have no reason to believe 71 grains wont work well with A-Frame as well.

Where can you find RL 15? What I originally wanted.

 

[Rare Breed]

Where can you find RL 15? What I originally wanted.

Unfortunately I have only found it in stock on GB and of course they are so expensive

 

[F. Vaccaro]

Don’t rule out good old IMR 4064.

 

[375er]

Don’t rule out good old IMR 4064.

And Win 760, H380, and....

 

[Robmill70]

I am surprised, I have searched this thread and not found as much load data on a 375hh as i thought I would.
Hopefully I will have my first 375 in my hands this month. Then on to load development, I really like to shoot and I have a1000 yards range behind my house. Do not expect to stretch it to 1000 yards but who knows.
I hope to first regulate the irons with a factory load, 270gr or so. then put my scope on and work up a 250gr and 300 gr load. I have had good luck with Barnes and would like a ttsx load for North América/plains game and a 300 gr load for buffalo.

I used 4350 and RL15 with the Barnes 300gr TSX.....the rifle prefers the RL15 just a touch better.

 

[meigsbucks]

I load 300gr Barnes with WW748. H4895 works well with the 300gr Swift.

 

[Shooter375]

RL-15 has produced the best accuracy with 300 grain A-Frames. But RL-15 is impossible to find right now. So I use Varget as a replacement. I have not got as good of accuracy with Varget but it is supposed to be more temperature stable though. I have also shot 250 TTSX which land about 4 inches higher of the 300 grain A-Frames.

 

[Qc_BearHunter]

My BRNO 602 shoots the Hornady 270- grains all over the paper, but the 270 TSX easily around 1 inches.

It's worth to try a few combination.

 

[pilar]

I got this email from Barnes about loading a 375 ruger , I assume it will work loading a H&H with 4350 or something else not listed in their manual



“”
If wanting to use a powder/bullet we do not have load data listed, you can use "other" (jacketed lead core or monolithic) bullet load data when loading a Barnes Bullet of equal (or close to) weight. Using data from HodgdonReloading.com or other sources/powder/bullet manufacturers. JUST BE SURE TO START AT THE MINIMUM STARTING LOAD and work up from there in half grain increments watching for signs of high pressure such as, a sticky (hard) bolt lift when ejecting the fired case, ejector mark on the case head stamp or flattened/leaky primers. Once you notice any of the high pressure signs then you will want to lower the charge about half a grain or so to where no high pressure signs are present, and that would technically be "YOUR" rifle's max load. The load data published by all of the companies is just a reference point/guideline to safely start out at the minimum charges. The MAX charge solely depends on your rifle's chamber, barrel length, powder lot #, brass case capacity/manufacturer and your environmental conditions. Using a website, loaddata.com’s “THE ULTIMATE RELOADING MANUAL” for the sole purpose of finding specific load data can be a huge time saver.



When loading a Barnes TSX, Tipped TSX or LRX bullet, your rifle may prefer a bullet jump of anywhere between .050” up to .250” or more. This distance off the lands (rifling), aka “jump” may be limited to the rifles throat length, magazine length and bullet length.

When selecting the cartridge overall length (COAL) we recommend starting with a minimum “jump” of .050” off the lands. This is the point where your load development should begin. You can then later test different seating depths and find a “sweet spot” that your particular firearm prefers. We suggest working in at least .025” increments as follows seating the bullet deeper to allow a further jump. Your test plan could look something like this:

1st group- .050” jump
2nd group- .075” jump
3rd group- .100” jump
4th group- .125” jump
5th group- .150“ jump
6th group- * see below

This length can be determined by using a “Stoney Point Gauge” or other methods/tools designed to determine your rifles best COAL. You do not have to seat the bullet at, or on one of the cannelure/pressure relief rings. The pressure relief rings have nothing to do with seating depth; ignore them! Remember, there are many factors that may control or limit the seating depth for your application. You may find that you need to start at around 0.150” off the lands and are not able to get any closer due to limiting factors including proper neck tension and magazine length.

*In rifles that have long throats you may be limited on how close you are able to get the bullet to the lands. In these instances, it is not uncommon to find the best accuracy with a jump of .200” or more.

This jump may possibly stay the same regardless of powder or charge weight within a given rifle. If preferred accuracy is not obtained, we certainly recommend trying another powder, for the powder type and charge greatly affects the overall accuracy of each individual firearm.

FYI- An accurate load requires a bullet with the proper consistent case neck tension which leads to more constant pressures and velocities.

Hodgdon and Hornady both have 270 gr “lead core” data but if both the above two processes are used you will have a fine reload developed before too long. As for the 235 gr TSX bullet use the 250 gr SFT AF bullet load data on the Hodgdon website. https://hodgdonreloading.com/rldc/?t=1 Remember to start low and work up.



Thank You
Alan Griffith | Consumer Service
Barnes Bullets

 

[roklok]

Yes, unfortunately RL15 is pretty much nonexistent on store shelves for the past few years. There is some on Gbroker, luckily I have some from prior to all this craziness.

 

[Hunter4752001]

For 270 gr jacketed projectiles, my go to powder is AR2209 (sold in the US as H4350). For 250g Barnes TTSX I use AR2208 (sold as Varget in the US). Both powders should be available.