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Joined: Nov 2018
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Wow! I knew this was an accurate load but wasn't sure what the ballistics were until today. Ran my last 5 of them over the chronograph, so it's not really enough for statistics, but all indications are that this is a good load:

270 grain Hornady Round Nose Soft Point (sadly, discontinued)
69 grains of RL-15 (I don't have any more, hope it's still available somewhere)
Federal 215 magnum primers
R-P brass

Average is a mediocre 2533 fps
ES is 21 fps
SD was a mere 8 fps

Mind you, I'm aware it was only five shots, but I only had five of them left. My 270 gr round nose Hornady bullets are gone. I used that load to do well at the last Safari Rifle Championships, Libby Montana, 2019. Didn't win, but did well with my single shot Ruger.

69 grains of RL-15 is listed as the accuracy load by Nosler for their 260 grain Accubond, and I've taken a few black bear with that load, out to 306 yards, so I know it works afield.

Wish I could latch onto some RL-15 again!

Regards, Guy

Last edited by Cascade; 05/16/22.
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I've always found RL15 to be the bee's knees in the 375. Haven't gotten around to trying RL16. Someday maybe Alliant will catch up with demand.


I am continually astounded at how quickly people make up their minds on little evidence or none at all.
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If you can’t find the 15 …..maybe you can locate some WW760! My Model 70 shot incredible groups with it. A few grains over listed max, though it was the listed max in a very old Hornady publication! memtb

Last edited by memtb; 05/16/22.

You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong." -Bob Hagel

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In my quest to get the Barnes 250TTSX to shoot in my M70 (which was unsuccessful BTW) I tried IMR4320, H4895, H335 and a few others. IME the 375 is a very easy cartridge to find an accurate load for and any powder in that general burn rate area will work.


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Back when I worked up my 270 grain load, I was after the same MV as my 180 grain load in my .30-06.

That ended up being 75 grains RL-15 and a large rifle primer for ~2750 fps. Using a 215 primer was fine, but the 210 grouped measurably better.

I just got some more RL-15, so keep your eyes peeled and crawler bot working overtime...


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I've owned three Pre 64 Model 70 375s and all three were exceedingly accurate. Cloverleafs were the norm with the Hornady 270 bullets and a load of H4831 behind it... shooting one from the bench wasn't a pleasant experience, though , which is why they all eventually went down the road...


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They still make 270 grain SP, not RN. I have quite a few of them. Where I hunt, I need to keep away from temperature sensitive powders. I have had bad experiences with WW785, WW760, & H414. I think WW785 was the worst. I had tested a very accurate load in my 300 Win Mag with WW785. I took it out to the Ft. Peck range; it was a little over 100 degrees. The last round I shot had the base expanded into the bolt so that I had to take the bolt out and put a lot of side force on the bolt while the case was in a vise to get the case out of the bolt.
Before I mounted a scope on my 375, I shot this load (iron sights)

375 H&H AI, Winchester, Pre-64 70, 300 grain Hornady RN, 85 grains IMR4350, 2.54 MOA

I've loaded up some 270 grain loads and will be testing them.

Last edited by Bugger; 05/17/22.

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Originally Posted by Bugger
They still make 270 grain SP, not RN. I have quite a few of them. Where I hunt, I need to keep away from temperature sensitive powders. I have had bad experiences with WW785, WW760, & H414. I think WW785 was the worst. I had tested a very accurate load in my 300 Win Mag with WW785. I took it out to the Ft. Peck range; it was a little over 100 degrees. The last round I shot had the base expanded into the bolt so that I had to take the bolt out and put a lot of side force on the bolt while the case was in a vise to get the case out of the bolt.
Before I mounted a scope on my 375, I shot this load (iron sights)

375 H&H AI, Winchester, Pre-64 70, 300 grain Hornady RN, 85 grains IMR4350, 2.54 MOA

I've loaded up some 270 grain loads and will be testing them.

Do you need some 375 H&H AI brass? I have about 50 pcs for a rifle I bought but never shot. The brass was fireformed and not shot again AFAIK...


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I loaded 80.5 grains of CFE223 in Winchester cases behind the 270 gr Hornady SP for 2706 FPS



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Originally Posted by jwp475
I loaded 80.5 grains of CFE223 in Winchester cases behind the 270 gr Hornady SP for 2706 FPS

Useful load. I like the idea of moving a 260 - 270 grain bullet about the same speed that my 30-06 moves a 180...

I've thought about trying CFE 223 with the 375 H&H...

Guy

IC B3


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