85 degrees F.
Qual Cart brass 2.935" long case.
F-215 primer.
RL-15 powder, 110 to 115 Grain charges, three shots each.
Bullet: 500 grain Barnes Original RNSP with 0.049" jacket.
With COL ~3.746" uncrimped seating, air space remains, room for more powder!

110.0 grains Rl-15 ... ave. vel. 2565 fps:

111.0 grains ... 2579 fps:

112.0 grains ... 2608 fps, ES = 7 fps

113.0 grains ... 2625 fps (Began using sissy bag here.)

114.0 grains ... 2650 fps

115.0 grains ... 2685 fps, ES = 13 fps

The last load (115.0 grains of RL-15) shot best, grouping into 3/4" at 50 yards for three shots, with iron sights and sissy bag.

As a velocity control, a couple of locals let me run their factory rifles with factory loads over my chronograph:

50 Beowolf with 325 grain bullets, in short barreled AR-15 type carbine: 1853 fps for three shot average. Axel was nowhere in sight.

444 Marlin 240 grain bullet from 22" barrel: 2305 fps.

I must have a very fast 470 Mbogo, 25" barrel.

The 50 Beowolf guy let me shoot one of his gallon jugs filled with water. It died by 470 Mbogo instead of 50 Beowolf. Water and milk jug fragments sprayed 50 feet upward. More dramatic than the 50 Beowolf by a bit.

Now the object will be too download the Mbogo to 2500 fps with accurate, premium 500 grainers, soft and solid, and get a scope mounted: 2.5X Leupold.

I believe I could easily get 500 grainers over 2700 fps with this rifle. But who cares for that? Not me.

What a cartridge! Thanks to Dave Estergaard.

Some 45 Lapua loads were also chronographed alongside these. See the Wildcats Forum for data.

Cheers!

.460 Weatherby velocity @ lower pressures. Ah, the efficiency of boresize! How's the shoulder feeling today?

Good Lord! That really IS an artillery piece

Impact energy measured in megapounds.

Yeah ... how IS the shoulder today?

DagaRon,
Thanks for keeping us updated on the reloads. Still working on getting the pieces/parts together for mine...but someday...hopefully soon

Still don't have a barrel just yet. Who made this one?

Regards,
Jeff Pfeifer

[ 06-24-2003, 00:09: Message edited by: Pfeifer ]

My Boy, sounds like you just might need a heavier bullet!
I want one of these....

Dagga, if you can handle 500 grains at 2700 fps, you can handle 750 grains at 2300 fps. In other words, the 585 nyati is well within your reach.

Yep, the 470 Mbogo ought to be able to top the 460 Weatherby in velocity and KE with 500 grain bullets, at lower pressures, with the right powder, but this is not necessary. Dave and Canuck seem to like 2500 fps with 500 grain premium bullets. That sounds smart to me too.

But I wonder if I have a tight barrel since I got such high velocities so easily? The pilot that came with the JGS reamer measures 0.465" by my measure, but a slightly smaller pilot of nominal 0.4645/-.0002" had to be ordered to chamber this barrel.

The Pac-Nor stainless barrel is a 1 in 16" twist with six grooves. 25" long and 0.750" at the muzzle, sporter contour, no muzzle brake. The rifle weighs 10.75 lbs bare, with its steel reinforced laminate stock and express sights.

The shoulder is holding up fine, guys, since it has been previously immunized with a 577 T-rex, and the .510 JAB/500 A2.

I really don't have any need for a .585 Nyati, thanks. The 470 Mbogo is plenty.

But a .375 Lapua sure would be sweet ...

A .375 Lapua and a 470 Mbogo would make a nice battery.

Aloha

No bore envy here, guys. You win the pissing contest. I prefer to just write my name in the snow instead of seeing who can piss over the highest fence post yonder. A man has got to know his limitations. Uncle!

yeeeeeeeeee doggie - did you build from a CZ550 action? KMule

KMuleinAK,
It was done on a BBK-02 action that was purchased around 1993. I think they call these "Ultramag" actions now, and designate them BBK-01 now, strangely enough.

If I ever get the stock prettied up and the Talley bases and rings installed, I will post a picture of it here, but not until.

I don't want to make a laughing stock of myself with the likes of Dave Estergaard and Robgunbuilder posting their showpieces here.

My rifle is built hell-for-stout, and I will add one more grain of powder and get 2700 fps with 500 grain bullets. Aloha

Hi Ron,
Sounds like your having a pretty good time. I used the Rl 15 load of 111 grains for 2515 average in a twenty four inch barrel and then stayed with 110 for an actual speed of 2500 average. From your test loads you can see why 2500 fps should give moderate pressures and lots of horse power. Everyone that has tested out their 470's have found a very accurate load in the 2500 fps area quite quickly. It sounds like you'll have to go out and try the bullet performance now.
Take good care,
Dave

Dave,
My stainless Pac-Nor No. 6 sporter with six grooves and 1 in 16" twist must be a fast barrel.

Extrapolating backward (from the range of 110 to 114 grain loads), 107 grains might give me 2500 fps.

That last step of one grain to 115 gave a 35 fps increase.

Of course the statistical significance is questionable with such a small sample.

I am going to try 115.5 and 116.0 grains, then go down to 109, 108, 107, 106. BTW, I don't usually jump in with midrange loads and work up, then work down, but the 470 Mbogo just seemed to dare me to.

You have a nice cartridge, but the case body taper is so minimal that it is not as slick a feeder as the 45 Lapua. I will be loading that one up to 2500 fps with 500 grainers, and hopefully not getting any pressure signs.

The 470 Mbogo will be loafing at 2500 fps with 500 grainers.
Aloha