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Thread: What are your most accurate .375 H&H loads?

  1. #1
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    Default What are your most accurate .375 H&H loads?

    I just burned through a box of Hornady 270 gr Heavy Mag while sighting in my new rifle, a Winchester M70 .375 stainless classic w/synthetic stock 24" barrel, I have a Leupold 3.5-10x40 scope. and I couldn't get a group tighter than 2.5" - 3" at 100 yds. I bought a couple boxs of Hornady brass and am ready to start working up a load this thing likes, I will be using 270 gr bullets for starters. and I am thinking IMR 4350 but am open for suggestions.

    What works for you guys?

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    For powder, you're going to want to use RL-15.

    Try the 260-grain Nosler Accubond. 70g- 73g (max).

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    I use RWS Brass in .375 H&H and 4350 powder for both the 270 and 300 grain bullets. Both with the same amount of powder. I use Woodleigh bullets and no others. Every .375 H&H I own shoots these in less than 2". Some not much under 2" and a couple in a little over 1". I know they would all do better with more scope. The highest power I have for them is6X. I've thought of mounting a 36X just for fun.

    I think it's safe to say that 4350 is the powder for the .375 H&H.
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    74 grains of 4064 w/ 235 Barnes TSX
    76 grains of 4064 w/ 235 speer hot cor
    Fed 215 primer / rem. brass

    1" groups @ 100 yards & 2.5" @ 300 yards: killed alot of stuff w/ the speer load.. These are MAX loads use with CAUTION......

  5. #5

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    73 of Re 15 with a 260 Accubond - 1.1 inch 3 shot 100 yards

    77 of Re 15 with 270 TSX- 1.3 inch 3 shot 100 yard

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    I recently had the same issue with my .375 Ruger... The best I could do with factory Hornady 270gr was a frustrating 2-3".

    Haven't tried something as light as 235gr.

    I could probably do better by tuning a load but I seriously lack the time.

    A swap to Hornady 300gr RN factory ammo yielded 5 seperate 3 shot groups just under an inch. That'll do for anything I'll shoot at.
    A quick confirmation puts 300gr solids into the same place.

    Difference in trajectory between 270 and 300gr. is pretty nominal until you get way out there.

    It might be an easy fix.

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    Quote Originally Posted by hodgeman View Post
    I recently had the same issue with my .375 Ruger... The best I could do with factory Hornady 270gr was a frustrating 2-3".

    Haven't tried something as light as 235gr.

    I could probably do better by tuning a load but I seriously lack the time.

    A swap to Hornady 300gr RN factory ammo yielded 5 seperate 3 shot groups just under an inch. That'll do for anything I'll shoot at.
    A quick confirmation puts 300gr solids into the same place.

    Difference in trajectory between 270 and 300gr. is pretty nominal until you get way out there.

    It might be an easy fix.
    An easy fix would be to reload (and cheaper).

  8. #8

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    I'm still working on my Browning .375 H&H A-Bolt, but so far the best results have been with the Hornady 300 RN and IMR 4064. My loads have averaged 1.5" or so for three shot groups at 100 yards with a 4x scope.

    270 gr. Hornadys and IMR 4895 didn't do well at all.

    My next trip out will include loads with IMR 4350 and 300 Sierra boat tails.

  9. #9

    Default .375 Powder

    I have had very good results with H414 and 300 gr. Swift A-Frames and 300 gr. Nosler Partitions, both will shoot sub MOA in my rifle. Velocity on the Chronograph is very good also.

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    Member nrc's Avatar
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    Default HH

    72.0 Gr RL15 with Barnes 270gr TSX
    or
    66gr Varget with Hornady 300gr RN.

    The former should give 2600 fps, the later 2300 fps.

    Good luck.

    Nate

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    A couple of bullets that have shot well in a several 375's I have loaded for are the Hornady 300 RN and 260 Nosler Part. As far as powder selection, I have found RL 15 Ideal for the 260-270 grain bullets and H4350 for the 300 grain stuff.

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    74 gr RL 15 with Hornady 270 gr Round nose and CCI Mag primer. This is a true sub one inch for 5 shot load in my Winchester model 70 at 100 yards. Believe it or not, as often as not, I can shoot a 3 shot clover leaf with this load at 100 yards. Substitute the 270 Gr spitzers and you can expect the groups to grow by about .5 to 1 inch. At least that has been my experience. No other bullet has ever even come close to the Round Nose Hornady for tight groups, and I have tried nearly all of them except the Barnes. 4064 has been the next best powder for me, but RL 15 has consistantly come in with tighter groups. I never did Chrono this load, so its anyones guess as for velocity, but I would suspect they are up there with the factory fodder. they seem to have plenty of "thump" at the shoulder, but I have never killed anything with it either, although the friend that turned me onto this load has 3 Bou, 1 Moose, and 2 Bears that fell to it............... for what ever that may be worth to ya.
    “You’ve gotten soft. You’re like one of those police dogs who’s released in to the wild and gets eaten by a deer or something.” Bill McNeal of News Radio

  13. #13

    Default Ballistics

    I know we all put too much into paper ballistics, but just check out what they ballistics are for the 260 accubond at 2800 FPS. This was calculated at 2000 ft elevation...Basically the power of the 375 and the ballistics of a 270!!!!!

    Max Point blank range is 279 yds when zeroed at 237 yds. Below figures are with a 200 yard zero

    Muzzle Energy - 4526 FLBS

    300 YARD ENERGY - 2973 FLBS 7.7 inches low
    400 YARD ENERGY - 2563 FLBS 22.1 inches low
    500 YARD ENERGY - 2197 FLBS 44.1 inches low

    To go with this, this load is sub 1' in my gun!!!!

  14. #14
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    Nosler 260 grain partition with Fed 215M primers and 73.0 grains of RL-15 for 2800 fps in 24" of barrel. All my 375's (H&H) will put a magazine full inside an inch. It is a great 300 yard moose load.
    Is there nothing so sacred on this earth that you aren't willing to kill or die for?



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    Quote Originally Posted by Murphy View Post
    Nosler 260 grain partition with Fed 215M primers and 73.0 grains of RL-15 for 2800 fps in 24" of barrel. All my 375's (H&H) will put a magazine full inside an inch. It is a great 300 yard moose load.

    I haven't never played with the Partition bullets in any of my 375's, but my experience is the same with my 375 H&H with a 24" barrel and 260-grain Accubond's.

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    Default 375 loads

    300 Sierra, 78 grains H4350, CCI 250, 2600 fps 0.5" group Rem XCR
    300 Sierra, 65 grains H4895, CCI 250, 2500 fps 1.0" group XCR
    300 TSX and Banded Solid, 68 grains 4060. Point of impact same.. 2450 fps 1" groups Win70
    235 TSX, 68 grains RL15. 2800 fps 0.5" groups

    Reminder.... load less and work up. I shoot for accuracy... not speed.

    Really like the 235 TSX. Acts like a 300 win mag/200 grain trajectory Not quite certain I'd shoot it on brownies.... 300 better for that... but in a pinch...

  17. #17
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    Default Correction on TSX 235 grain RL15 load

    As with all loads shared on this site.... caution is needed and comparison with published data is a must.

    235 grain TSX, RL15, 78 grains (not 68 grains). The 68 grain load is for heavier bullets... While on the "safe" side ... I wanted to correct this.

    A 235 grain load was one of the first offered by Holland & Holland along with the 270 and 300 grain loads.... nothing has changed in weights for 6 years shy of a century... Holland and Holland got it ALL right on the first get-go for this .375 (as opposed to the first attempt).

    The 235 was never popular. Now with premium bullets that can hold together and hang though, light and fast with penetration and weight retention offers new horizons for the .375.

    Carrying a 375 means you never have to walk alone.

  18. #18
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    I knew I would get a lot of good info on here.

    I think I'll start with the Nosler 260gr partitions with the RL-15. I have had the partitions work pretty good in my 7mm but different rifles have different tastes.

    once I get this weight sorted out I'll work on some 300gr loads.

    Thanks for the info, and keep it coming.

  19. #19

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    With your 300 gr RN loads are you talking about FMJ? I have a box of these that I'd like to shoot up and 'm wondering if I would get good expansion on a moose? Still new to reloading and looking for some opinions. Usually shoot the Nosler partions in my other guns with good luck but just have a box of these bullets I'd like to use up but if they are not a good hunting round I can stick to the usual.

  20. #20

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    The 300 grain Hornady bullets I was using are their Interlock soft points.

    The FMJ bullets are designed to NOT expand so as to ensure the deepest penetration.

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