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416-375 RUM Load Help

 
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  #1  
Old 03-19-2013, 06:45 PM
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Join Date: Feb 2013
Location: SW Alaska
Posts: 130
416-375 RUM Load Help

Hello all I was wondering if anyone can punch this cartridge into quick load for me? I will be using 350 Barnes tsx and 400 grain a-frames. Case capacity is 115 grains and I was thinking h4350 or h4831 as my powder choice. The tube will either be a 26" or 28" pacnor. I am sure I can push the 350s at 2800 and the 400s at 2600, but would like to get a ballpark estimate at where to start my load data. Thanks

Reuben
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  #2  
Old 03-19-2013, 10:05 PM
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Join Date: May 2004
Location: Alaska
Posts: 430
Re: 416-375 RUM Load Help

I would contact "J E Custom" for load data, if anyone on LRH has info on a 416-375 RUM would be him, his version is the "414 BUFF"

some info here......
416 BUFF

and here.......
416 BUFF revisited
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Old 02-25-2014, 09:45 PM
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Join Date: Feb 2013
Location: SW Alaska
Posts: 130
Re: 416-375 RUM Load Help

Well got my barreled action in today, bolted it in my Mcmillan stock and topped it off with a 1-4 nightforce scope. I started with 86.0 grains and finished with 92.0 grains of H414. Here is the data.

38F, 28.8"Hg, Alt 250'
86.0 2348, 2436, 2371 SD45
87.0 2463, 2414, 2414 SD28
88.0 2458, 2395, 2414 SD32
89.0 2464, 2505, 2496 SD21
90.0 2449, 2477, 2488 SD20 Recoil stout now pressure still low.
91.0 error, 2501, 2526 SD17 Recoil stout still low pressure
92.0 2547, 2535 SD8

Primers are looking good, no pressure signs, and bolt opens like butter. I will load a couple more at 93.0 and 94.0 and shoot them tomorrow to see if I can hit 2600 before I pressure out. The 92.0 grain load looks good and should be safe in warmer weather also, but just want to see what the rifle will do with a stouter charge. I cleaned the barrel after 88 grains and it took six rounds to settle back down. 91-92 tightened back up. I still need to get used to shooting a 4 power scope I am spoiled with my 30 power on my 300 RUM. Here's the target and some brass (91-92 grains).


Reuben
Attached Thumbnails - Click to View Larger
416-375 RUM Load Help-img_0509.jpg   416-375 RUM Load Help-img_0512.jpg  

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  #4  
Old 02-26-2014, 05:45 PM
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Join Date: Feb 2013
Location: SW Alaska
Posts: 130
Re: 416-375 RUM Load Help

Tested 93 and 94 grains of H414 today and have found my load.

40F, 28.4"Hg Once fired Rem brass weight sorted, Fed215, 400 A-Frame
92.0 2560, 2566, 2570 SD6
93.0 2573, 2575, 2570 SD2
94.0 2604, 2598, 2592 SD6

I shot 92 grains to foul the barrel after a vigorous cleaning and the first two were about 2 moa high and than it settled right down. I am going to test some W760 that I have at 91 and 92 grains to see if it runs close to the H414 I have both in velocity and SD. If so I shall combine into a single lot as I am low on H414 and have a touch more W760. Here's the grouping for 93 and 94 grains, and a pic of the rifle.

Reuben
Attached Thumbnails - Click to View Larger
416-375 RUM Load Help-img_0514.jpg   416-375 RUM Load Help-img_0516.jpg  

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