IMR 3031 – The ExhaustNotes Blog

By Joe Berk

This story is about finding a decent load for my .243 200th Year Ruger No. 1 rifle. The rifle is 48 years old now, but the old girl can still get it on. I didn’t think my Ruger was particularly accurate at first, but wow, it’s a shooter.

Good wood, a good looking 200th Year Ruger No.1A, and a day on the range. Life is good.

I’ve tried a lot of loads in this rifle and I probably would have given up except for what I saw happen with another shooter. He had a .243 No. 1 in the 1B configuration (that’s the one with no iron sights, a 26-inch barrel, and a beavertail forearm), and he didn’t like it at all. To me, not liking a Ruger No. 1 is a crime against nature, but that guy was frustrated with his .243 and he had given up on it. He spent good money (Ruger No. 1 rifles sell for around $2,000 today) and it just seemed like a shame. When I first tried my .243 No. 1 it wasn’t very accurate, but I decided I wasn’t going to be that other guy. I was confident I could find a good load. Actually, I found three, and they are listed below by bullet weight. They are all of comparable accuracy in my rifle.

Accuracy Load No. 1

Nosler 55-grain .243 bullets. It’s the lightest bullet available for the .243.

Bullets, loaded ammo, and XBR 8208 propellant.

My first accuracy load for this rifle is the 55-grain Nosler Varmegeddon flat base bullet with 40.0 grains of XBR 8208 propellant. I seated the bullets to a cartridge overall length of 2.606 inches without a crimp, but I haven’t experimented with bullet seating depth or crimping. I used Fiocchi large rifle primers because at the time, primers were scarce and I bought 1500 of the Fiocchis when I could.

Accuracy Load No. 2

Hornady 58-grain VMax bullets. Hornady makes a good-looking bullet.

I shot all the rounds I loaded with this bullet, so this picture will have to do.

Another excellent load is the 58-grain Hornady VMax bullet with 42.0 grains of IMR 3031 propellant. I ordinarily wouldn’t use IMR 3031 in the .243, but I had a tiny bit of it left from some development work on another cartridge and good buddy Kevin told me IMR 3031 was his powder of choice for the .243. It was a good recommendation. I set these rounds up with a cartridge overall length of 2.620 inches. Like the load above, I have not tried different seating depths or crimping.

Accuracy Load No. 3

Cavernous hollowpoints in the 75-grain Speer varmint bullets. These shoot exceptionally well.

I found IMR 4895 works well with the Speer 75-grain bullets.

My third accuracy load is the 75-grain Speer Varmint hollowpoint bullet with 39.0 grains of IMR 4895 propellant. I loaded this round to an overall length of 2.620 inches, and like the others above, I have not experimented with overall length or crimping.

What I Haven’t Tried and What Didn’t Work (for me)

I have a couple of boxes of 65-grain Hornady V-Max bullets and I’ve only tried them with a few powders. So far, nothing gave me acceptable accuracy with these bullets.

.243 ammo loaded with PRVI 100-grain bullets. I couldn’t find the secret sauce to make this bullet accurate. Hornady 100-grain bullets weren’t any better.

I also have a bunch of 100-grain bullets (from Hornady and PRVI). Neither of these 100-grain bullets grouped well. They stabilized (no target key holing), but the groups just weren’t very good. That’s okay; I’m not going to use the .243 on pigs or deer. But if I ever took it varmint hunting, the accuracy loads listed above would get the job done.

The Bottom Line

Typical results with the accuracy loads listed above.

Any of the above loads will shoot a three-shot group at or below 0.75 inches at 100 yards. The groups would be tighter with a more skilled rifleman. For me, getting the old .243 to group into three quarters of an inch is good enough. I’ll call it a day with load development on this rifle and stick with the loads above. On to the next rifle. Stay tuned.

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