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Howdy folks,

I currently have a .375 Chatfield-Taylor on it's way to me, and have done a fair bit of research on appropriate powders (seems Varget, 4064, RL15 are favoured). I have D4895 (very similar to IMR4895) which I think is a little bit faster than them, but hope will work. The only other powder I have any real supply of is H4831. I have both 300gr and 235gr bullets coming, and am hoping to come up with a 235gr load to carry while deer and bear hunting this fall.

Since it's just a necked up .338 Win Mag, I was wondering about using .338 data with the same bullet weight as a starting point? I'm assuming (which I don't really like doing with reloading) that since I'll have a bigger bore, I'd have lower pressure? Then work up with the Chrony watching velocity and for pressure signs. I'm mostly just wondering if I'm on the right track.

Thank you,

Cory

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Not sure exactly, but with heavier bullets in the 250-275 weight range I used RL22 and similar for the top speeds, I’d kinda think you’ll be using faster powders in the 375 version with the same bullets. It’s quite a lot different in diameter. Kinda like the 06 and 35 Whelen. There is some crossover but not a ton.

Maybe check case capacity and see where you sit compared to the 375 H&H and Ruger cases and extrapolate data from there.

I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.


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Had a .375-338. 4064, Varget and RL-15 are what you want to use.

You don't want to use .338 WM data - it's a very different expansion ratio

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Originally Posted by beretzs
I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.

That's what I did with mine. No troubles. Mine liked Varget.

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Originally Posted by beretzs
Not sure exactly, but with heavier bullets in the 250-275 weight range I used RL22 and similar for the top speeds, I’d kinda think you’ll be using faster powders in the 375 version with the same bullets. It’s quite a lot different in diameter. Kinda like the 06 and 35 Whelen. There is some crossover but not a ton.

Maybe check case capacity and see where you sit compared to the 375 H&H and Ruger cases and extrapolate data from there.

I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.

Thank you for the advice.

Originally Posted by MuskegMan
Had a .375-338. 4064, Varget and RL-15 are what you want to use.

You don't want to use .338 WM data - it's a very different expansion ratio

I know those are the ideal powders, and I'd like to use them, but I went to 4 gun shops last week and reloading components were pretty empty and grim. I'm hoping to find something that will work until (hopefully) things get better again.

Originally Posted by SuperCub
Originally Posted by beretzs
I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.

That's what I did with mine. No troubles. Mine liked Varget.
Thanks for the help Paul, I appreciate it.

Cory

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I had one for a while. It was in an Interarms Mark X with 22" barrel. Killed a few elk then moved it along.


Here are some loads that shot accurately:


64 gr of varget, 300 sierra, 2490
59 gr of RL-15, 260 accubond, 2325
66 gr of RL-15, 260 accubond, 2675
68 gr of RL-15, 260 accubond, 2775
75 gr of RL-15, 235 TSX, 2990
235 Speer, 72 gr H4831, 2325

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Originally Posted by Azshooter
I had one for a while. It was in an Interarms Mark X with 22" barrel. Killed a few elk then moved it along.


Here are some loads that shot accurately:


64 gr of varget, 300 sierra, 2490
59 gr of RL-15, 260 accubond, 2325
66 gr of RL-15, 260 accubond, 2675
68 gr of RL-15, 260 accubond, 2775
75 gr of RL-15, 235 TSX, 2990
235 Speer, 72 gr H4831, 2325

Thank you, that H4831 load looks especially promising for the components I have on hand.

Cory

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Scratch the load for the 235 listed above .

(235 Speer, 72 gr H4831, 2325) I did some digging in my notes and all my loading books and cannot find this load anywhere. Not sure how it got into my files as H4831 is too slow for this combination.

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The rifle arrived yesterday and I had a chance to shoot it with these results using necked up .338 brass, Winchester LRM primers, Speer 235gr bullets and D4895SSC powder. Jethunter kindly ran a Quickload calculation for me that made me feel a lot better about all of this. The D powder suggested using IMR data minus 10% which put it right in the middle of a starting. 338 Win and .375 H&H data.

60gr - 2315FPS
61gr - 2366FPS
62gr - 2403FPS
63gr - 2438FPS
64gr - Error on Chrony
65gr - 2542FPS
66gr - 2572FPS
67gr - 2605FPS
68gr - 2632PS

I was only able to shoot 25 yards, but as expected, it was just one ragged hole. I was hoping for an accurate load around 2500FPS or so, as all I have this fall are a bear and a couple deer tags...and though this is my first .375, I feel like it will suffice wink

Thanks everyone for the help,

Cory

Last edited by CoryTheCowboy; 08/11/22.
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I talked to a tech at Speer years ago about those 235s. He said they were designed for use on smaller game like deer.

I used to carry my 375 deer hunting and that's the bullet I used but never did get to shoot a deer so no 1st hand experience. After a while, I got tired of the weight and went back to my 257Roberts.

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Originally Posted by SuperCub
I talked to a tech at Speer years ago about those 235s. He said they were designed for use on smaller game like deer.

I used to carry my 375 deer hunting and that's the bullet I used but never did get to shoot a deer so no 1st hand experience. After a while, I got tired of the weight and went back to my 257Roberts.

Perfect, that's what I'd heard as well.

It was tough enough to justify a big gun when we were getting bull tags every couple years, and with adult moose tags becoming harder to get than a straight answer from a politician here, it's even harder to justify...but justifying a rifle is a slippery slope

Cory

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Ted got me hooked on 35s and 375s years ago. I did a bunch of them and eventually got tired of the recoil, heavy rifles and extra cost while coming to the realization that for my needs where I live, a 30-06 would be perfect for my "big gun".

While I do have a 30-06, I also have a 300H&H. I look at that 300 as a +P 30-06 so am justified in owning it. smile


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