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Discussion Starter · #1 ·
Does anyone use/recommend W296 powder for 200 gr 375 Win handloads? Looking at the straight wall pistol and rifle cartridges that Hodgdon recommends using W296, it seems to me W296 is a nice fit for the 375 Win. W296 is a high load density, high pressure and energy powder and is loaded in large capacity and high pressure cartridges to 90% or more load density (W296 is dangerous in low load density, below minimum, etc). Hodgdon recommends W296 powder for 350 Legend, 454 Casull, and 460 S&W. I could put the 375 Win in this family of cartridges. The 350 Legend is often highlighted as just shy of the 375 Win. Also, the 454 Casuall and 375 Win have almost identical case capacity (47 vs 49gr). The 454 Casuall does have a higher CUP (60k vs 375 Win 50K). The 350 Legend has less case capacity then the 375 Win and 460 S&W more case capacity than 375 Win (the 350 Leg and 460 SW also have a higher CUP). While the 454 Casuall case length is short, the case length of the 350 Legend and 460 S&W is 1.8 and just shy of the 2.0 case length of the 375 Win. It seems to me, if W296 is a go to powder for these similar cartridges, why not for 375 Win? Is it a 375 Win pressure issue? Also, in these powder scare days, a new powder option for 375 Win would be welcome. Too bad Hodgdon or other reputable source doesn’t invest in exploring W296 for 375 Win. Seems to me there is a knockout W296 load/bullet combo for 375 Win. Any thoughts?
 

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The 375 Super Magnum used a shortened 375 Win case. Would start with a recommended Super Magnum load of H110/296 load and work up. 22 grs H110/296 with a 220 bullet, but double check, the old notes may be off.
 

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One of the best powders for the OP’s application is AA1680. It gives the highest velocities at relatively low pressures compared to RL-7 and others.

H110/W296 is just too fast for the large .375 case, the loading density is too low for consistant ignition and it gives poor performance and could be unsafe. Using .375 SuperMag data is a terrible idea. There is a reason why Hodgdon does not recommend low density loads with these powders in the .44 Magnum etc.


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Discussion Starter · #4 ·
Hodgdon DOES recommend 296 for 44 Mag, across the board, all 44 Mag bullet grain weights. Yes, 296 is one of those powders that you CAN NOT load below minimums. Low density loading is dangerous for 296. However, following Hodgdon's load info, 296 rocks in large, high pressure, straight wall cartridge loads. 296 really is a specialty powder and really does need good reliable cartridge min/max load data by cartridge. . . . The 375 win case seems like a perfect candidate for 296 powder . . .
 

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I think you would have to be crazy to try win 296 in the 375 win case, it's too fast of burning powder. Reloader 7 shows highest velocity in the 375 win case, but I never achieved good accuracy in my four 375 wins made by Marlin, Savage, Ruger, and Winchester. H4198 has been my go to powder in the 375. I went a tenth higher than the Hornady manual and have been happy with velocity and accuracy.
 

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Hodgdon DOES recommend 296 for 44 Mag, across the board, all 44 Mag bullet grain weights.....The 375 win case seems like a perfect candidate for 296 powder . . .
Uh, did you read my post? Hodgdon DOES NOT recommend low density loads for the H110/W296 twins. Due to their bulk volume these powder will have a low loading density at safe pressures in the .375 - with potentially dangerous results.

The OP come here, asks for “thoughts”, then argues against the very recommendations he asked for. He had clearly made up his mind before asking and just wanted agreement - which he didn’t get. AFAIAC, he is welcome to do whatever he wants, it’s his rifle.



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I looked at QuickLoad just out of sheer curiosity
W296 / 90% fill under a 250gr Speer / 55,000psi / 2.045fps / 20" barrel.

Cartridge : .375 Win.
Bullet : .375, 250, Speer
Cartridge O.A.L . 2.560 inch
Barrel Length : 20.0 inch

Not first choice --
But when all the dust settled . . . #2
Typefill (%)vel (fps)
Norma 200 (Compressed)110.0000 (4% compression)2049.2310
Winchester 29689.00002026.0526
 

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Discussion Starter · #8 ·
Sorry Rollingblock. Yes, I understood your low density comment and highlighted that if you follow Hodgdon guidelines they do recommend W296 for 44mag. Sorry I offended you.

Yupper, W296 is in the family of powders where you have to stay above minimum and watch load density among other issues. Maybe a reason to avoid it since it is dangerously finicky.

The QuickLoad data from Mehavey keeps me interested in continuing to explore W296 loads (and buy QuickLoad program)...
 

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I have had very good luck with A1680 and 220 gr Hornady Interlocks in my 375 Marlin--took a deer with that combo last year. RL-7 and H4198 are great in straight walled cases--they both work well in my Triple-4s and 45-70s. I would stick with those so as to not worry about pistol powder "issues" in a greater capacity rifle case. YMMV.
 
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I agree with all the above praising AA-1680 for the .375 Win. Personally I used Reloader 7 for a couple years before I finally acquired some 1680 and it hands down become my favorite. Both of my Marlin Model 375's like it better anyways. First, it gives more consistent velocity's, plus much faster velocity. Better accuracy and it even burns out cleaner.

Using data for RL-7 it was hard pressed for me to reach some load data. Now my 200grs loads twist out just over 2,400 fps but I have even pressed over 2,500 fps just by changing primers but with CCI (my fav) it consistently dumps over 2'400 fps and that's just what I call it at.

Now the 255gr Barnes Original thumps the old shoulder at over 2,100 fps with CCI large Rifle primers. That is the max load from data I got directly from Accurate Arms and it's 100 fps faster then .375 buffalo bore ammo. My first rifle definitely gives better accuracy with these bullets but they don't expand worth a hoot even at these speeds.
 

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I have to agree, W296 does seem suitable 375 Win powder. Sure it is fast and difficult to get the load right. I think Hodgdon simply hasn’t invested the time in developing a W296 load for the 375 win. Of course Hodgdon has a W296 load for the 350 Legend because the 350 Legend is current, new kid on the block, and firearms companies wants to generate excitement for the 350 Legend. But if w296 works for 350 Legend and 460s&w, why not for 375 win (no one has explained that)? I'm curious if the 375 win is too long and narrow a cartridge for a fast powder? No one, but those familiar with the tried, and true and strengths and weaknesses of the 375 win, want to invest in 375 win new lead bullets, new lead free bullets, or new powder options…Skip the big powder companies and do safe load development. I use 1680 for 375 win 200gr Sierras. Perhaps I’m stuck in a rut. Hadn’t even considered why Hodgdon recommends W296 for similar high pressure cartridge designs but not for 375 win. Nor do I have time to explore new 375 win loads. More power to those with the time and money to explore. . . .
 
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