Has anybody used the IMR 4350 to load a Barnes TSX bullet in a 375 H&H

[Rburns28]

Going on a Buffalo hunt in 2025 and working up some loads for my rifle. Got some loads loaded up with RL 15 powder with the 300 grain TSX and would like to try the IMR 4350 powder to. Haven't been able to find any load data for this powder and bullet combo. Any help would be appreciated

 

[Clodo Ferreira]

Hi Rburns,

I have used 83 grs of IMR or Accurate 4350 in my Winchester 70 pre 64 (1954) with lead core 270 grs and 80 grs with 300 grs lead core bullets. Best loads for 100% load density with the best pressure-velocity relationship.
For the 300 grs Barnes, even for 270 grs Barnes, 4350´s are somewhat too coarse grained for these long for the weight bullets.
I will try some ball powders like W760 or one of the newer ones like Big Game powder.

Good luck!

CF

 

[meigsbucks]

I’ve tried IMR4350 with 300gr bullets, but I didn’t get great accuracy or velocity. I’ve had good results with H4895 but find 748 works great (max load in mine is 75gr, but as you know, work up)

 

[DLSJR]

I’ve never tried 4350 for our 375’s as both my son and I have had such good results with 70.0 grains of Reloader 15 pushing 300 grain bullets that there hasn’t been a reason to try anything else. We’ve had great results on buffalo with 300 grain TSX’s. Also love Bearclaws, A Frames with that load.

 

[cash_tx]

I have been slowly working my way through a ladder of Barnes TSX 300's and IMR 4350, and here are my notes so far. My COAL was limited by the magazine box, so I couldn't follow the normal Barnes advice of starting 0.050" off the lands. I started getting load compression at 68 grains, and found a promising node at 71.0 and no signs of pressure. I don't have a chrono, but my next step is to test 72 - 74 grains (if the cases will hold it).

As always, reduce powder charges by 10% before trying in your gun.

 

[PHOENIX PHIL]

Going on a Buffalo hunt in 2025 and working up some loads for my rifle. Got some loads loaded up with RL 15 powder with the 300 grain TSX and would like to try the IMR 4350 powder to. Haven't been able to find any load data for this powder and bullet combo. Any help would be appreciated

My M70 Safari Express in .375HH loves IMR4350 regardless of whether it's a 300gr A-Frame, North Fork or TSX. The loads for which are of course different, but all are very accurate.

Barnes has starting loads on their website for RL15 and Varget. Those are both faster than IMR4350, so you maybe could use that information as a starting point.

 

[Rburns28]

Thx for the help guys

 

[Luvthunt]

The mag in my 375 is on the short side and IMR 4350 gave me some issues. The load is compressed and tended to push the the 300 gr lead core forward a bit that then gave me problems in the mag. The monos would be even longer.
I did use a Lee die to help hold but results varied.
I changed powders to accomplish a less fill in the case.

 

[Green Chile]

Yes, I have used H4350 and 300 TSX but I prefer using H4895 and have had excellent results on multiple DG and many PG with that load. I have never recovered that bullet with the exception of one in a big, tough croc on a neck shot that anchored him. They are like shooting a big oak log.

 

[WyoBull]

If you have already found a load that works, stick with it unless you just want to play around burning up powder and bullets.

I use RL15 and the Barnes 300 gr TSX and if I do my part it will cloverleaf 3 shots at 100 yards from the bench. RL15 is a great powder for the 375 H&H.

 

[pilar]

I inquired about 4350 in my 375 ruger and barns basically said 80-81gr
My buddy found a sweet spot for his H&H @ 76gr

“”
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

 

[Rburns28]

Thx Alan that's some good info

 

[Wyatt Smith]

A long tube powder funnel will help get that much powder in the case.

 

[Clodo Ferreira]

I think Rburns was clear about his question: 4350 with 300 TSX in a 375H&h?
In MY experience it is not near a good combo for an optimal pressure-velocity with a standard magazine lenght of 3.6".
For a best pressure-velocity with this components one must go for a ball or spherical powder or, at least, a very fine grained or super short cut tubular one, in the 4350 burning rate class.
With almost any lead core (not the super long Accubond as an example) the 4350s work great!

Good luck!

CF

 

[KTMpilot]

I’ve tried IMR4350 with 300gr bullets, but I didn’t get great accuracy or velocity. I’ve had good results with H4895 but find 748 works great (max load in mine is 75gr, but as you know, work up)

I can second this 100%: I previously had great results with H4895 and when it became unavailable where I live, I tried IMR 4350 but even with a 103% load I couldn't get a 300 gr bullet faster than 2200 fps with IMR 4350. I then found Reloader 17 and now am very happy again, >2500 fps easy with a 300 gr point.