.375 Winchester in Marlin 375

madtrapper143

madtrapper143

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Just aquired a Marlin Model 375 in, of course, .375 Winchester from a fellow Gunnutz member. I had visions of building a load for this rifle to bring out it's full potential. I have Hornady 220 gr flat points and some Re 7 powder. Here lies the problem, when I load the suggested amount of powder the bullet seats and then the compressed powder pushes the bullet forward. This load is a compressed one for sure. I want a load that will move the 220 bullet at 2200 fps with re 7. Any recipes or suggestions? I am not comfortable with a load that has to be compressed that much. (it is safe and the data is from a reliable source) What I am looking for is a load that moves the 220 the same speed as the winchester factory 200. (2200fps) Stated fps with the compressed load is over 2300 . Any help would be appreciated. By the way I shot a 5 point buck with the factory fodder last week and it really knocks them compared to my .30-30 or .303 Savage.

cheers Darryl
 
I use 32 grains of H4198 with the 220 grain Hornady bullet. Unfortunately I have not checked this with a Chronometer but it groups better than factory loads in my Winchester Big Bore (seems to leave the bore dirtier, though)
 
What you ask may be very hard to do. I worked with that same gun for many years & never got that kind of velocities:rolleyes:

Factory 200s do run at 2200fps but factory 250s only gave 1750-1800fps
I believe once you go over 200gns the velocities drop of very fast with heavier bullets. The best velocity I ever got with 220gn Horns was 2100fps w/36gns of H-4198 & I believe that was TOO hot a load :eek:
I was never able to get the published results with RL-22.

Here's my best for you to try
Best hunting load 33.5gns of IMR4198 gave me 2" groups @ about 1950fps:)

The best accuracy was 32.5gns of IMR4198 for some 1" results:)

I found H-4198 to be a good powder giving consistant 100fps more velocity but in my gun it just would never show the accuracy that the IMR powders did:confused:

Pretty much all loads in the 375 are compressed loads you just have to use a little crimp & pick a load your happy with. Another hint that may help a little is not to trime your brass to minimum length, it may not be much diff between min & max but max is the length of a crimp which will help in this caliber.
 
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