I never dared to show this target for fear of disbelief. You will see why I stopped after three shots, just working up loads over a chronograph and shooting at multiple spots on a sight-in target. This was at 100 yards, not 25 yards.

This was a "do not use" load on the AR.COM reloading pages section: .375 Weatherby.



Range: 100 yards
3-shots, center to center = 0.138" = 0.132 MOA

Bullet: Bridger monometal-copper copy of Saeed's 300-grain .375-caliber Walterhog.

Brass: Hornady Basic necked down by simply running it into the RCBS .375 Weatherby sizing die, then annealed, then trimmed.

Primer: GM215M

Powder: RL-15, 78.0 grains

Temperature: 50 degrees F


This target was shot with an M70 Winchester Stainless Classic that was rechambered from a .375 H&H to .375 Weatherby using the Dave Manson Reamer of CIP spec. Rifle was made circa 1992 to 1993. Barrel quality must have been good at that time.

Rifle had a tupperware stock with the hot-glue bedding replaced with some Steel Bed and creative hole drilling to make the epoxy stay put, only at the primary action recoil lug. nothing else. Trigger adjusted to 3.5 lbs.

Scope: Leupold 2.5x-8x with standard duplex reticle

24" barrel
velocity average for the pictured three shots: 2717 fps

There were faint ejector marks on the brass.
COL was 3.720", loaded single-shot-style directly into the chamber.

The Walterhog is a long-nosed bullet, 1.520" long. It works well in a CZ with 3.8" box instead of the 3.6" box of the M70.

My CZ rechamber has higher velocity at lower pressure with the 25" barrel and longer box in .375 Weatherby. It is a 3/4 MO shooter instead of .132 MOA. It uses H4350 to get 300-grainers up to 2800 fps with no ejector marks.

The Winchester has a heavier barrel.
Eureka again to Will.

We are lowering the bar here to .375 caliber or larger. Any competition out there? Any challengers?

Give me hollow hell, Will.

Give me hell Will.

I will probably never better this.

We are lowering the bar here to .375 caliber or larger. Any challengers?

First Purple, now Silver

And the beat goes on:

1) Leonard's .500 Schuler Jumbo (Original Mauser by Sterling Davenport) 3-shots touching.

2) Your .470 Capstick (Winchester M70?)3-shots touching.

3) Box stock off the rack Ruger M77 RSM chambered in .416 Rigby called by the name "Ol'Purple" shot .140" 100 yard group.

4) And least, but far from least a M70 SS Classic re-chambered to .375 Weatherby posts an .138" 100 yard group.

Whatever your technique is, its consistent

Did you have the Walterhog seated just-off the lands? Standard Weatherby throat length?

Sir,
Proper technique requires optical correction to 20/10 vision, and years of practice, then a meditative trance before pulling the trigger at paper.

Lifelong preparation and maintenance includes a regular diet of carrots and Habenero peppers of at least 500,000 SU rating.

Surprisingly some of the most zealous practitioners of this near-religious sport come from the ranks of has-been marathon runners, looking for an endorphin fix.

They grow fat and sassy and happy in old age, until they go blind from retinal detachments.

Oh, yeah, The Walterhog was well off the lands in a .375 Weatherby with .3700" freebore length.
That is one long nosed bullet of high ogive number. It is meant for a 3.8" box on a 2.85" length case like Saeed's .375/404.

How about this with a 375 H&H and a 4X scope at 100 yards?

all you need is a minute of buffalo...

big bores on hummingbirds and this might be useful...

good shooting all!

Pretty good. You can barely see the powder burns on the targets

quote:

Originally posted by IanD:
Pretty good. You can barely see the powder burns on the targets

Oh, no, that is a 100-yard target done while developing data for this:
http://www.accuratereloading.com/375wby.html
Here is the reamer throat we spoke of above:



And a new name for a Walterhog bullet copy: Rosiehog.

The Rosiehog bullet is fourth from left in this view:

Great shooting RIP. Was just funnin' with you
Can you do the .500 A2 next

I'll think about it.

quote:

Originally posted by RIP:


And a new name for a Walterhog bullet copy: Rosiehog.

Hey! That head fits absolutely perfect!! It belongs right there!

I swiped that from prof242.
His comment was one of disappointment that the hog was photographed with its ass-end in the left foreground, and the head with tusks is hidden in this view.

Thanks for the byline RIP. Now if we could get Walterhog to make a few .395s for this "treat" pictured here.
For some reason, I think we'd have a heck of a time on a hunt.

How's this Rip? jorge

375 target

I knew this would flush out some good "accuracy load" data for .375's. Thanks, Jorge and Fjold.

Occasionally that good load data and our "compensating errors" come together for three good shots from a good rifle. Why risk enlarging such a small group with a fourth shot? Three shots is enough for bragging about a hunting rifle.

Excellent work bro',

FWIW, Lock, STock and Barrel has factory Weatherby brass for $35.00 a box of 20.

I had my second hand (used once) PT&G reamer reground to those specs that you show.

Bro' Dart,
I have stocked up on the Norma-made .375 Wby brass already thank you, good tip.

Norma brass has 111.5 grains of water capacity.
Hornady basic brass like I showed above has 108.2 grains of water capacity, after fire-forming.

Norma brass is indeed the way to go. I have plenty of it now.

Norma brass would tame the Rosiehog load properly, might even require an extra 1/2 grain of powder.

Second from left: That is a Weatherby factory load with Norma-made brass with 300-grain Nosler Partition. It was 2734 fps in my 24" barrel and no ejector marks! However accuracy was 1.1" for 3-shot group at 100 yards.
COAL for the factory ammo is 3.565" and it contained 88.5 grains of mystery powder that looked like MRP.

RIP!

Check this out from the Reloading Forum -- 375 RUM accuracy

Not a "full patch" load, but mighty impressive.

I guess JohnT missed this thread, or doesn't come on the big bore forum much. Helluva group...just a few thou' bigger than yours!



Cheers,
Canuck

quote:

Originally posted by Canuck:

Canuck

Canuck,
There is a blank spot on my screen where that target image should be.
Thanks for the eye candy, but the puter at work is blocking images to protect me from obscenity.
I will have to look at it later tonight. I can't wait!

Yes! I can see it now. My question is, why would anyone want to so precisely drill holes through the center of an entire artist's sketch pad?

I recall JohnT, and his rifle is an early model Classic Stainless M70 rechamber job like the rifle I used. His in .375 RUM and mine in .375 Wby. Those were some good .375 H&H barrels.

H4350 (AR2209) is a great powder for the 300-grainers at lower velocity in the .375 RUM.

I prefer H4350 with 270-grainers at higher velocity, and H4831SC (AR2213?) for the 300-grainers, in the .375 RUM. I could dig up some targets, but none as good as JohnT's .375 RUM.

The .375 Wby cleans up a .375H&H chamber completely.

However, the .375 RUM has a slightly longer neck and same overall length as the .375 H&H, so it does not completely clean up the shoulder area, hence produces a "radius effect" on the RUM chamber shoulder that is visible on the .375 RUM brass at the neck-shoulder junction (Weatherby-ized) after it is fired in JohnT's rifle, IIRC.

This partial venturification has not hurt accuracy one bit, eh? Nothing wrong with a Weatherby shoulder.

To avoid this when rechambering from .375 H&H to .375 RUM one must set the barrel back, one thread. I whacked the threads off completely on one Winchester .375 H&H barrel and had it rechambered to .375 RUM, resulting in a 23" barrel on a CZ action. I felt there was enough shank/Knoxform to allow this, with the Winchester barrel. Here is that Work-In-Progress (WIP). You will recognize a Winchester barrel on a CZ action. Hey, I am a Kentucky redneck and own a lot of rifles, even some BAT such as this (WIP also stands for Weatherby ImProved):



This rifle was also re-throated with a .375 Weatherby throater, so it is actually a CZW 55070 in .375 RUM-WIP-RIPoff, aka .375 RWR.

It has no CZ markings visible to inspection, this being an AHR action with a blank billboard. The only markings visible are on the barrel and declare it to be a Winchester M70. The ".375 H&H" was artfully changed to ".375 RUM" by an engraver, and skillfully refinished all over in GunKote matte black.

It still needs a 3-pos M70-style safety and a trigger, but the CZ 550 trigger and safety worked well enough to get this rifle blooded on a Kentucky buck shot from a tree stand. It blows big holes right through deer.

However I promise you it was not inspired by the rifle built by AXEL's "father" who converted a CZ action into a "true-magnum-sized M70."

The CZW 55070 in .375RWR was built before AXEL ever posted that story.