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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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chuck375
.333 member


Reged: 13/10/07
Posts: 445
Loc: Colorado Springs CO
Full length resize or neck size 375 H&H
      #88056 - 31/10/07 12:54 PM

Hi, I just ordered some 350g Woodleigh Protected Points and solids to work up some loads for my 375 H&H. I've always neck sized my cases then run each loaded cartridge through my magazine/action 3 or 4 times to ensure they fed properly, but I've never owned a DGR before. Is that sufficient or should I full length resize?

Thanks,
Chuck

--------------------
"There's a saying in prize fighting: Everyone's got a plan until they get hit"

Michael Douglas "The Ghost And The Darkness"

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Tatume
.400 member


Reged: 09/06/07
Posts: 1091
Loc: Gloucester, Va USA
Re: Full length resize or neck size 375 H&H [Re: chuck375]
      #88092 - 31/10/07 11:41 PM

Hi Chuck,

There is no accuracy lost to correct full-length sizing, and it does add a measure of security. The reason I usually neck size my hunting rifle practice ammo is for convenience; it's easier. In fact, and contrary to popular wisdom, many world-champion bench rest shooters full-length resize. When I bought my most recent bench gun from Clay Spencer (Stolle/Hart/Six), he not only recommended full-length resizing, but sold me the 6mm PPC dies. The sizing die uses a bushing so that the neck is only sized the correct amount for the fitted-neck chamber; there is no expander ball. But the case body is sized and the shoulder is set back slightly.

My hunting ammo is full-length sized using ordinary dies. I know it will cycle through the gun under all circumstances, and as I have several guns in most chamberings, I don't have to worry about segregating my hunting ammo. I recommend full-length sizing your hunting ammo.

Take care, Tom

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chuck375
.333 member


Reged: 13/10/07
Posts: 445
Loc: Colorado Springs CO
Re: Full length resize or neck size 375 H&H [Re: Tatume]
      #88093 - 01/11/07 12:22 AM

Thanks Tom, I'll go with the full length resizing die. It certainly makes my choices easier.

--------------------
"There's a saying in prize fighting: Everyone's got a plan until they get hit"

Michael Douglas "The Ghost And The Darkness"

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DarylS
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Reged: 10/08/05
Posts: 27014
Loc: Beautiful British Columbia, Ca...
Re: Full length resize or neck size 375 H&H [Re: chuck375]
      #88096 - 01/11/07 02:02 AM

I use a full length sizing die, but make sure I don't push the shoulder back by properly adjusting it in the press. I then check for function and feed of loaded ammo.
: Most belted magnum rounds are oversized in typical cheap production sizing dies, whether Hornady, RCBS, Lee or Lyman. If the shell holder touches the bottom of the die, depending on which way the moon is phasing, the shoulder can be pushed back up to .030". This creates excessive slop of the ctg. in the chamber and results in only 2 to 4 shots per case before the case splits ahead of the belt. This excessive slop is transalated as excessive headspace. Yes, I know belted cases are supposed to headspace on the belts. Have you ever measured any? The headspace in factory rifles is from "0" to + .006" for rimless ctgs. This is the SAAMI allowable limit. Belted magnum brass itself can be out up to .010" and if the gun is out as well .006"?(and it will be)
; Any time your brass splits ahead of the belt, or above the rim or extractor groove, it was due to excessive headspace - there is no other cause, period! The excessive headspace may be in the rifle, or in the ammo, caused by you or whoever loaded it.
: If your brass is not lasting 15 shots, you are ruining it through over sizing OR, loading to excessive pressure and expanding the primer pockets. Excessive pressure does not cause head separation on the brass. Oversizing is not necessary, for any ammo. When you oversize, you create excessive headspace on the shoulder and brass life suffers.
: Some case designs overstretch when firing, and they will have shorter case life. Modern rounds don't suffer from this. My .375H&H brass went over 20 loadings at factory ballistic levels - no more is needed.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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Mike_McGuire
.333 member


Reged: 11/06/05
Posts: 348
Loc: Sydney Australia
Re: Full length resize or neck size 375 H&H [Re: chuck375]
      #88097 - 01/11/07 02:35 AM

Chuck,

Tom is spot on.

In fact in bench style rifles in calibres such as 270 and 300 Winchester that have a conventional chamber cut I found that in general the best accuracy came from both new brass and FLS brass. The barrels were generally set up to have about .003-.004" headspace on new brass ie. much the same as a factory gun. When FLSing the dies were set to duplicate this.

An added bonus of FLS is that you can usually get loads in new brass and FLS brass to shoot to the same point. Quite often the best accuracy with neck sized brass requires a different seating depth to FLS and very often best accuracy with neck sizing requires the bullet to be seated out further. Unless a 375 is in rifles such as CZ or Wby Mark V the magazine usually limits OAL to 3.6" and that is pushing it for the M70.

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400NitroExpress
.400 member


Reged: 26/11/03
Posts: 1154
Loc: Lone Star State
Re: Full length resize or neck size 375 H&H [Re: DarylS]
      #88116 - 01/11/07 05:50 AM

Quote:

; Any time your brass splits ahead of the belt, or above the rim or extractor groove, it was due to excessive headspace - there is no other cause, period!



Not true. Sometimes it's just crap brass.

Quote:

: If your brass is not lasting 15 shots, you are ruining it through over sizing OR, loading to excessive pressure and expanding the primer pockets.




Again, not true. It would be nice if all cartridge brass was made to a minimum quality standard, but it isn't. Lots of brass out there that simply isn't up to that kind of case life, no matter what you do.

--------------------
"Serious rifles have two barrels, everything else just burns gunpowder."

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