NitroX
.700 member
Reged: 25/12/02
Posts: 40759
Loc: Barossa Valley, South Australi...
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Thank you all for your help, this information will prove very helpful for me in the coming months when I will start experimenting with the big 375.  neck sizing only sounds like a very good idea with this belted magnum, as does checking length after every firing.
I actually full length resize my .375s every time. The brass might not last as long. But much more reliable and easier to chamber cartridges when hunting dangerous game. I prefer the reliability over neck sizing advantages.
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As for loads, right now I have only one suitable powder for it, that's Lovex S070. Since pretty much every shooting range is closed due to the annoying pandemic right now I will send the loads to the proof house instead and let them analyze pressure, speed and consistency of my reloads.
Yes very annoying for you.
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My first handloaded .375s. I chose an OAL of 3.527 - at 3.543 the projectiles start to kiss the lands. I cycled them a couple times to check feeding.
As above I keep my cartridges for big bores and dangerous game well off the lands for reliability over range accuracy. My cartridges are very accurate anyway. My .375 Whitworth M98 is a standard length action so to get the cartridges to feed into the magazine they have to be shorter anyway. No problems with accuracy at all. One-third to one-half MOA, 3 shot groups.
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John aka NitroX
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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"
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DarylS
.700 member
Reged: 10/08/05
Posts: 27781
Loc: Beautiful British Columbia, Ca...
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.375's flat out shoot very well & they (or at least many) usually put all bullet weights into the same usable group with one sight setting.
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Daryl
"a gun without hammers is like a Spaniel without ears" King George V
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Rule303
.450 member
Reged: 05/07/09
Posts: 5280
Loc: Woodford Qld
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.375's flat out shoot very well & they (or at least many) usually put all bullet weights into the same usable group with one sight setting.
I too have found that to be the case with both my, now ex CZ 550, and Rem700 in 375H&H
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Woldan
.224 member
Reged: 17/03/16
Posts: 32
Loc: Austria
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I got the results from two loads I sent to the proof house, both are milder than I expected, I thought they would be close to maximum.
I'm especially interested in the load with S062 which does 736 m/s / 2410 fps with about 3300 bar / 48k PSI. Shot it through my BRNO, mild recoil, burns super clean.
Carefully bumped the load up from the measured 68.5 to 72.5 grains. Recoil was noticeably increased but the primer did not flatten or crater, bolt lift + extraction was super easy and the case did hardly grow at all.
Unfortunately my crony did not give me a reading testing the loads, it does well with everything up to .308 but for some reason it fails to measure the .375. But if I had to do a rough estimate I'd say it should be around 760-770 m/s / 2500-2530 fps or so.
I'll have to wait till the whole corona situation has cleared up a little to do serious shooting and testing though. Its really bad here right now. 
I cannot mention enough how much I love this rifle and cartridge. Recoil is big yet slow, the rifle just rises and pushes me back, its not really a kick. I once had a 7.5lbs 45-70 1886 with a steel butt plate and a short stock and loaded with 300 grain bullets to about 2100 fp/s this thing felt like getting hit with a baseball bat. 10 shots was enough to make me flinch.
Right now I'm tempted to scope it, I have a 2-7x33 Zeiss scope laying around, but it does have really nice express sights. In my head scoping it would kind of ruin its dangerous-game hunting flair, yet with the scope it would be a much more useful rifle. Decisions, decisions....
Edited by Woldan (21/03/21 10:17 AM)
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DarylS
.700 member
Reged: 10/08/05
Posts: 27781
Loc: Beautiful British Columbia, Ca...
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IIRC, my BRNO .375 ZKK602 was over 11 pounds after I scoped it.
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Daryl
"a gun without hammers is like a Spaniel without ears" King George V
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Woldan
.224 member
Reged: 17/03/16
Posts: 32
Loc: Austria
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Quote:
IIRC, my BRNO .375 ZKK602 was over 11 pounds after I scoped it.
Shes a big girl for sure! What scope did you install?
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DarylS
.700 member
Reged: 10/08/05
Posts: 27781
Loc: Beautiful British Columbia, Ca...
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1st was a straight 4X Ruko scope. Cheap scope that never lost a beat.
When the rifle was a .358 Norma Mag. I had a 12X Bushnell on it for shooting coyotes and target usage (3-position with cast bullets).
Soon after te-barreling it with a 602 .375 bl. I removed the 12X scope and put on the Ruko as a hunting scope, sighted it in, then sold the rifle (in a period of insanity).
I have owned 3, .375's since and still have only one.
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Daryl
"a gun without hammers is like a Spaniel without ears" King George V
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