300 Win Mag, Alliant 4000-MR, Federal 215 primers & Hornady 200 gr ELD-X

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I just got back from a range session this morning, taking advantage of the cloudy, 82 F temps which rate as a cold snap for August in Louisiana. As the title to this thread states, I was testing some 300 Win Mag loads with Alliant 4000-MR and Hornady 200 gr ELD-X bullets.

Why this combination? Let me explain:

300 Win Mag: I don't own a rifle in this caliber, but I have two sons-in-law that do. One has a Ruger M77 MkII with a 24 inch barrel and the other has a Browning A-Bolt with a 26 inch barrel. Both are left handed actions. A few months ago, @Manny R posted a for sale note for a bunch of once fired 300 WM brass, so I jumped on that deal.

Alliant 4000-MR powder: @tarbe made some people happy by selling some of his powder inventory earlier this year at pre-crazy prices. I bought an eight pound jug of this stuff, as it looked like a powder that would work on 7mm mag, 300 WM and 338 WM. There isn't much info available on this powder, but Alliant had this on their webiste:

1629138231018.png



Federal 215 Magnum primers
I have a bunch of these in inventory, but I am embarrassed to say what I paid for them during the past year or so.

Hornady 200 gr ELD-X bullets
I finally found some of these on GB a few weeks ago. Got 4 boxes of 100 for pre-crazy prices. This bullet has a high temp resistant plastic tip and a sleek boat tail design, giving it a very high BC of 0.597. Also lots of good real world reports. I sort of view the ELD-X and an improved SST, another bullet which I have used to take quite a few critters.

1629138781798.png



Given the Alliant recipe info, I decided to load 69 to 72 grains in one grain intervals. Loaded 5 rounds each, so 25 round total. Since the 200 gr ELD-X is a fairly long bullet, I seated the bullet as max COAL of 3.340 inches and put a slight crimp on it with a Lee factory crimp die.

1629140203094.png



Velocity is from a Magneto Speed. These are the results:

1629139090779.png


The 68 grain group was the worst (could have been me) and the 69 grain group was the best. I could have stopped with the 69 grain group and would have been very happy, about half an inch group. The 72 grain group was very good too. I think for my next trip, I will load some 0.2 gr intervals around the 69 and 72 and see what happens. I am also thinking 72.2 might be my max, as I don't need the 3000+ fps velocity. I typically hunt 300 yards or closer.

Any comments or observations are welcome.
 

Forrest Halley

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So you shot these groups through a left handed rifle? You just finished saying that you don't own a rifle and then we've got data. My curiosity demands that you fill in this void. Please.
 

375 Ruger Fan

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@Forrest Halley, yes I used the left handed Browning A Bolt with the 26 inch barrel. I am actually left handed, but right eye dominate so I have shot right handed all my life. I shot these rounds today, right handed from a Lead Sled
 

Shootist43

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Like you, I think I'd be more inclined to the 72 Gr. load. Velocity is approx. 150 FPS faster across the board. Ft. Lbs. of energy and penetration will be better as well.
 

shootist~

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I think the better load is the 69 grain running 2,856 fps. It just seems ideal for a 200 grain non bonded bullet. Easier on the rifle, brass and shooter as well.
 

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