Ruger RSM – The ExhaustNotes Blog

By Joe Berk

Make no mistake: Even a reduced load in the mighty .416 Rigby is a high-energy proposition. I use 350-grain cast bullets from the Montana Bullet Company, and my Lyman cast bullet reloading manual shows the accuracy load to be 45.0 grains of 5744 propellant. The reloading manual says that’s the lightest 5744 load with the 350-grain cast bullet, and that same manual says the load is good for 1779 fps. In my rifle, it was a full 100 fps faster, with a very tight standard deviation. A 350-grain bullet at 1877 fps is going to settle most discussions pretty quickly, I think.

.416 Rigby ammo, loaded with Montana cast bullets.

The .416 Rigby is a big cartridge. It’s shown here with a .45 70 and several .45 ACP rounds.

The .416 Rigby was originally developed in 1911 by John Rigby and Sons, a British rifle manufacturer, as a cartridge designed for hunting dangerous game (you know, like cape buffalo, elephants, and other stray critters not likely to be encountered on this continent). But the cartridge is a cool one, and that was enough for me to buy the rifle. The factory load is a 400-jacketed bullet at 2,370 fps (with prices ranging from $170 to $270 per box of 20 rounds), and that’s good for anything that walks, breathes, or grows, probably including more than a few dinosaurs. Those are steep prices, working out to about $8.50 to $13.50 every time you pull the trigger. Me? I reload with cast bullets. It’s still not cheap to send lead downrange, but it’s way cheaper than shooting the factory stuff.

I had not realized it had been so long since I previously shot the .416 (as my reloads indicated).

Chrono results for my .416 Rigby ammo. That’s a tight standard deviation. This is a great load.

The Lyman manual is right; this is an accurate load. At least it was for me at 50 yards.

Three shots at 50 yards with the .416 Rigby. That’s not too bad for an old man shooting an elephant rifle with open sights.

I then tried the Rigby at 100 yards. At 100 yards, my accuracy was poor, but that was me (not the rifle or the ammo). I had a difficult time finding and focusing on the front sight. It’s a function of age and the little front sight brass dot, and a pair of new glasses. I had a tough time seeing the front sight with my new specs; it kept blurring together with the black bullseye. The easy answer would be a scope, but the rifle is already heavy and maybe I’m too much of a purist; a scope on an elephant gun seems kind of silly. I have a scope on my .458 Ruger Model 77 and I like it, but the Rigby wearing a scope doesn’t go down well for me.

The Ruger’s rear sight. It’s a classy affair, with a fixed V-notch always up (it’s what you see here). For longer distances, each of the two blades behind the fixed blade can fold up. The two folding blades each have a U-notch, which is easier to see.

When I returned home I reloaded my spent .416 Rigby brass, grabbed my old glasses, and headed out to the West End Gun Club again. Things at 100 yards improved immediately. I fired the first three shots you see below using the lowest rear sight (the V, with no U-notch; it is fixed in the up position). I couldn’t see the bullet holes at 100 yards with the naked eye (hell, I could barely see the target), so I took a peek through my spotting scope and was pleasantly surprised.

Three shots at 100 yards with the fixed V-notch rear sight. Life is good.

That target looked good to me (and knowing I was going to photograph it for the blog I didn’t want to ruin it with additional shots). For those first three shots, though, I struggled to keep the front sight in focus and seated above the rear sight’s fixed V-notch. I decided to fold up the first blade, which is a little taller than the fixed V-notch. Seeing the front sight (and staying focused on it) in that first foldup blade’s U-notch is much easier, but the rear sight was taller. I expected the next shots to go high (which they did in a surprisingly big way…they were a good six inches above the bullseye). Two can play this game, I thought, so I walked downrange and put up a third target. I fired my remaining rounds while holding the top of the front sight about one bullseye diameter below my normal aim point (which is 6:00 on the bullseye). I guess you could call that Kentucky elevation.

10 shots at 100 yards. Not bad, but too high. I would have liked for that group to all be in the black.

The results were not bad. What I really need (maybe) is a taller front sight, and I’m casting about to try to find one of those. I have a call into the Williams Gun Sight company; maybe they will have something that will work. The reason I said maybe, though, is that several years ago with this rifle and the same load, the sights were spot on for me at both 50 and 100 yards. It could be that I was simply a better shot several years ago. I’ll try it again before I replace the front sight.

The .416 Rigby’s front sight. It may need to be taller for the load I am using. Note that there’s very little leading in the bore. That’s because the Montana bullets are hard cast, gas-checked, and appropriately sized.

Here are two more photos of the Rigby, showing its beautiful and highly-figured Circassian walnut stock. This rifle was a real find. It’s one I’ll never sell.

Ruger .416 Rigby RSM Magnum, port side. It looks even better in person.

Ruger .416 Rigby RSM Magnum, starboard side. It’s surprisingly easy to shoot with cast bullets.

I named my .416 rifle Eleanor (get it? Eleanor Rigby?). It’s the only gun I’ve ever owned that I named. I bought the rifle for well under what it’s worth off the used gun rack at Turner’s in West Covina (a locale with demographics more in tune with bangers and black plastic 9mm pistols). I paid a thousand bucks for Eleanor; these rifles typically go for around $2500 when they show up on the used gun market. There are a couple on Gunbroker.com right now; one is listed at $3,000 and the other at $7,000 (hope springs eternal, I guess). Ruger quit making these a couple of decades ago because they were too expensive to manufacture, making the small number they did manufacture instantly collectible.

I want to use this rifle with open sights on my next pig hunt. That would be challenging on several fronts:

- - I want to try for a Russian boar (instead of the more plentiful Ossabaw hogs I previously shot).
  - I want to use open sights (instead of the scoped rifles I previously used).
  - I’ll have to lug this anchor-weight firearm up and down in the Arizona hills where I hunt (instead of the lighter rifles I used on my prior hunts).

It should be fun. Stay tuned. You’ll get to read about it here.

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I don’t name my guns. Except for one. That’s Eleanor in the photo above.

I have a thing for big bore rifles, and chambered for the mighty .416 Rigby, Eleanor certainly qualifies. We don’t have too many elephants, rhinos, or cape buffalo in southern California. But if any ever become an invasive species here in the Peoples Republik, I’m ready. I’ve read all the African hunting stories, living vicariously through the adventures of folks like Theodore Roosevelt, Peter Hathaway Capstick, and others. It’s what prompted my path toward rifles like Eleanor.

But I digress. Back to the topic du jour. Sometimes you just wake up and think to yourself: I have to to load me some .416 Rigby today.

That’s what happened to me recently. I won’t get to shoot Eleanor for a few more days, but I thought I would share a few photos of the sausage-packing process involved in prepping .416 Rigby ammo. The drill on that fine day was for a couple of reduced-velocity loads using cast bullets and Trail Boss propellant. It’s going to be a fun day at the range when I light the candle on these puppies.

Reloading is sort of like cooking. You start with a recipe and the right ingredients. In this case, that includes .416 Rigby brass (something you don’t find laying around at the range) and Trail Boss propellant (which, like most reloading components, is pure unobtanium these days).

I’m well stocked with unfired, virgin Hornady brass and I used Montana Bullet Works cast 350-grain gas check projectiles. Because I’m loading cast bullets, the first step involved flaring the case mouth. I use the Lee universal flaring tool for this. You can see its business end in the photo below.

Here’s the Lee’s flaring die and a flared case mouth.

This is what the cartridge case looks like after it has been flared. You can see the diameter opens up slightly at the case mouth. This prevents shaving lead off the bullet base as it is seated in the brass cartridge case.

The Montana Bullet Works bullets are impressive. Actually, they are beyond impressive. I think they are perfect. They look more like machined parts rather than cast parts. I loaded their 350-grain flatnose cast bullets (they are 22 Brinell hardness linotype bullets) with a gas check base (take a peek at the next photo). The blue stuff is lubricant.

I’ve fired the Montana bullets before with 5744 propellant in Eleanor and they work well, as you can see on the targets below (I order my targets from Amazon). Those were 3-shot groups at 50 yards using the same Montana 350-grain cast bullets and 45.0 grains of 5744 propellant. Eleanor is an elephant rifle with iron sights, and I’m getting groups that would work well with prairie dogs.

There’s no leading with the Montana bullets. The Lyman cast bullet reloading manual (which I believe to be the best) lists 5744 and the 350-grain cast bullet as the most accurate load in this chambering (I like the Lyman manuals better than any of the others).

The photo below shows a bullet just starting into the cartridge case. I had already seated CCI 200 primers into the cases.

Trail Boss is a reduced velocity propellant that is designed to occupy most or all of a cartridge case’s interior. It’s a light powder. The shape is unusual. The grains look like little washers.

Trail Boss is so big and fluffy my RCBS powder dispenser couldn’t throw a big enough charge with a single throw. I wanted to load these at 30 grains and 34 grains (suggested min and max with this propellant), so I set the powder dispenser to 15 grains (that’s what you see in the powder tray above) and threw two charges for each case, and then I did the same at 17 grains (again, throwing two charges for each case). According to the folks who make Trail Boss, the max load should not exceed the base of the bullet, and the minimum charge is 70% of the max charge. Here’s what a charged case with the max charge looks like.

I next seated the bullets. These cartridges are so long that you have to put the charged brass case into the shell holder, and then angle the bullet up into the die and set it back down on the case before you run the ram up. I do bullet seating and crimping in two operations. I’ll seat all the bullets to the required overall length without a crimp, and then I’ll adjust the die and run each round through again to get a good crimp. I use an old RCBS Rockchucker single-stage press I bought new in 1974. I’ve been using it ever since.

And here’s one last photo just to convey a sense of scale. From right to left, what you see below is a six-pack of .45 ACP cartridges in a moon clip ready for my 1917 revolver, a .45 70 round (I loaded some of those earlier today, too), and the .416 Rigby.

So how do these Rigby rounds shoot? I’m going to find out soon, folks, and I’ll let you know. Eleanor and I have a date at the West End Gun Club (don’t tell Sue). Stay tuned. It’s going to be fun.