Stopping Rifles, .375 - .450 - .505 Gibbs

Ardent

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Getting ready to do a stopping rifles write up and shoot, plan to run .375 H&H in bolt and double, .470 Nitro double, .450 Rigby Granite Mountain M98, and a fine board member's .505 Gibbs RSM side by side on a moving target with myself and another recoil curious dangerous game hunter. The .375s are included as a baseline to see how our shot placement compares to the larger chambers for instinctive shooting. If the weather turns or we don't rig up a satisfactory target we'll use two targets at varied (closing) ranges shot in quick succession, my standard "budget practice". We'll likely have the shooter blinded to the exact target position until the moment of shooting by having a plywood blind-board we tip down and commence.

.505 Gibbs - .450 Rigby - 375 H&H

 
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For those who are curious, here's a nice writeup with some info on the 450 Rigby, 505 Gibbs, and Granite Mountain Arms rifles:

http://300winmag450rigby.########.ca/

Ardent, if you get a chance, can you post some pictures of the rounds you'll be testing?
 
I hope you don't mind me outing you as the owner and lendor of the lovely .505 stick. :)

I will for sure with the rounds, I measured up the RSM and it is a true brute, I've used one for a long time and hadn't really appreciated what a serious action it is. It's pretty clear to me Bill Ruger Sr was envisioning factory RSM .505s, or at least leaving the possibility open. The GMA action is smaller in most aspects and actually appears it would be a bit more of a challenge to chamber in the mega cartridges. It appears the RSM will even accept a .577 Nitro with a special magazine, its base is very close in size to the .505. Perhaps the way my .375 RSM will go.
 
I will for sure with the rounds, I measured up the RSM and it is a true brute, I've used one for a long time and hadn't really appreciated what a serious action it is. It's pretty clear to me Bill Ruger Sr was envisioning factory RSM .505s, or at least leaving the possibility open. The GMA action is smaller in most aspects and actually appears it would be a bit more of a challenge to chamber in the mega cartridges. It appears the RSM will even accept a .577 Nitro with a special magazine, its base is very close in size to the .505. Perhaps the way my .375 RSM will go.

I'm looking forward to your writeup and hearing about your thoughts on the rifles. One thing that interests me is what effect, if any, the dimensions of bolt handles will have on your ability to cycle the action for the follow-up shot, especially as you recover from the recoil. I have my thoughts, but I'll keep them to myself until after you've had a chance to try them out.
 
Have a sneaking suspicion that you may be on to something, but all my time with the RSM might mess up my side of it. My shooting associate mentioned uses none of these rifles regularly and should be a good test subject.

I bought a shot timer app to do this right, but it's not picking up even shots burning 80+Grs of powder! Probably worth buying a real shot clock. Step two of this one day I hope to follow Dogleg's lead and do in Australia, a .300 vs a .450+. In a perfect world, .375 vs .577, the smallest and biggest standard dangerous game cartridges.
 
Would love to see the test paramaters (the engineer in me).... jmop but maybe include something more typically north american as a comparison? .... maybe a 45/70?......
 
Not a bad idea for both shooters to use a light rifle first as a baseline for performance, though I feel we have that in the .375s. We both shoot .375 H&H as well as we will .308 for this drill, the recoil is just not in the class of distracting cartridges. It is my current upper threshold for mindless point and shoot, I'm hoping to get to that with .450 Rigby. Not sure if I have the gumption yet and keeping my mind busy on interesting targets is the best way for me to attack it. So as much as this is a fun test for me, it's training too. I do believe we'll try slugs though as we both work in deep bush and carry exactly that for bears, will be interesting to see how those stack up and they should meet the light and fast idea. Very Canadian as per Brad's suggestion too.
 
I came back from Africa enamored with the .500 NE, and while I get the argument, I was underwhelmed by double rifles. Although a custom Ruger #1 in .500 .577 or even .600 NE or a M-17 Enfield chambered for the half inch Jeffery, Gibbs, or Wells, could be had, the cost of components for cartridges in this class is intimidating. That's not to say that we can't thoroughly enjoy the performance of a Ferrari, but few of us can drive one often enough to allow our skills to make full use of the performance it has to offer, and so it is with these serious big bores. Ammo for running drills, and for recreational hunting could be made up with cast bullets seated over a measure of fast burning powder, and the ballistics of those loads would indeed flatten any North American beast. But unless the round is loaded with either a solid or an expanding jacketed or mono-metal bullet, loaded to full steam, you're cheating yourself. The world suddenly becomes full of new possibilities for the guy who has indeed mastered a true stopping rifle. These cartridges are not for shooting some unsuspecting animal on yon hill. They are not for mimicking the old time elephant hunters like Bell, who when he could arrange it, would shoot for the back of the head with a small bore rifle. They are for the guy who wants to confront the largest, most dangerous game in the world, and he wants to do it at less than 20'. Most people associate such confrontation with elephants and the impressive frontal brain shot made from blood on the shoes range, but it could as easily mean a lion, dry land hippo, and of course buffalo. Without the confrontation, hunting dangerous game looses something. But not everyone seems to get that, so elephants get shot in the chest from the safety of 75 yards, lions and leopards are shot over bait, hippo are shot in the water, and buffalo get sniped from 200 yards. Confrontation requires one to use the biggest rifle he can manage, while the less adventurous hunter can use a light rifle to achieve his goal. In the confrontation, you've only got one chance to do it right, there won't be a second, and the consequences of doing it wrong are too terrible to contemplate. This is where the big bores shine.
 
sometimes the confrontation is by choice of the hunter, but sometimes it comes as a surprise and that's where they really really shine. Bells 275 hunted in open country with unsuspecting game, others hunted thick brush and 'educated' or worse 'injured' game.

Taylors writing on the stopping calibers ability to knock out an animal for 5-40 minutes on a slight miss is also interesting. He also advocates the double rifle action for its silence after the first shot. Racking a bolt would cause stunned game to scatter.
 
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