Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

About time Biebs got back on here.
Sir Biebs OK for your Square Table name ?

Hey, any thread about big bores and I'm all in :-)

75 grains AA2230 behind 480 DGS Federal 215 primer.

Regular length magazine?

Interarms MarkX

I have a ruby smooth NH LH M70 sitting here doing nothing. You people are a bad influence.

That's a damn good load at 3.340" JWP, all of this 458 WM+ goodness over the past year or so has caused me to pull a long left in the dark and dusty old .458 cal double rifle out of the big safe, been shooting it too lately, it regulates perfectly at 65 yards with the 480gr DGX at 2142 fps, no 458 WM+ of course, but i'd still shoot any Buffalo with it.

Get on it bluefish, 250 to 600 grains, it's all waiting to please!

for coyotewacker:

From a B&M Forum member a load with 250-gr Hornady Monoflex using AA-1680 in a .458 WinMag, Ruger M77:

" ... figured out a load for my 458 WM using AA1680 ...
At 76 gr. only 8 fps difference 2922 fps in 5 shots all into under 1 1/4″ at 50 yards with a peep sight. It been a long time since I used a peep sight, sure glad I brought the peep sight for the Ruger 77. Now that its tuned for the Hornady next time I’ll work on the CEB 258 gr. bullet…"

Well, it seems AA-1680 might be about as perfect as AA-5744 for use in the .458 WinMag with 250-ish grain bullets at around 3000 fps MV from a 24" barrel.

Here is the donor rifle for for a 1:10" twist .458 WinMag capable of handling the 575-gr CEB Lazer hunting bullet.



Maybe CFE-223 would be a good powder for that one.
Sir Jerry has a doozy .400 Whelen load with that powder pushing 400-grainers to well over 2200 fps in a 23" barrel,
at normal temperatures stateside
and he had no trouble at ambient temp of 41*C, baking in Africa.
That is 105.8 degrees F.
That is brain-damage fever.
Or compressed H4895 or non-compressed AA-2460 would get the 575-grainers past 2000 fps.

Barrel: My previous 1:10" twist, .458"-grooved (slugged by me), 8-grooved, No. 4 Sporter stainless "Super Match" barrel from Pac-Nor
was cut to 19.75" on a .458 B&M, which has been re-throated with a .458 WinMag reamer.
It is now a ".458 B&M+W" which is what I am calling it this week instead of a ".458 BMW."
That will do lesser velocity trial loads with the 575-gr Lazer from CEB,
when I load it like a shell-holder action (M70 short action for WSM).

Looks like I need another Pac-Nor like Sir Jerry suggested.
This time a No. 6 Sporter "Super Match" to finish up at 28" length.
Fitted with Creedmoor iron sights and a Picatinny rail it might be about 10 pounds.
Lengthening the barrel from 24" to 28" only adds 0.33 pound according to the Pac-Nor barrel weight calculator.
Don't gain much after 28" of barrel,
start losing velocity about 30" barrel length with these new-fangled smokeless powders.



The .458 WinMag Creedmoor rifle is third in line at the Hilltop Gun Shop & Spa for Wayward Rifles.
1. 500 Jeffery Match CZ 550 Magnum for duplicating .50-140-3.5" BPCR loads with 1:20" twist McGowen stainless.
2. 400 Whelen Ruger M77 Hawkeye awaiting barrel hardware add-ons.
3. .458 WM Creedmoor Ruger No. 1.

Sir. Ron I got 2198 FPS using 75 grains of AA2230 with the 480 grain DGS. How much higher do you think my velocity will be with 76 grains at magazine length?

Sir John,
My experience is to expect about 20 fps more with another grain of AA-2230 added to your load of 75.0 grains with the 480-gr DGX.
You got 2198 fps instrumental.
If that was at 5 yards for chrono add 14 fps to correct to MV = 2212 fps.
If 2198 for MV by Lab Radar, no correction needed.

My load of 78.3 grains giving 2297 fps MV was in a 25" Shilen barrel instead of your 24" Whitworth barrel.
I got about 15 fps extra for my extra inch of barrel.
2297 -15 = 2282 fps for 78.3 grains AA-2230 expected in my rifle with barrel shortened 1 inch to 24".
3.3 gr X 20 fps/gr = 66 fps
2282 - 66 fps = 2216 fps for my rifle with 24" barrel and 75 grains AA-2230.
My MV 2216 fps for 24" barrel calculated.
Your MV 2212 fps for 24" barrel calculated.
Pretty darn close !

I predict you will get about 2232 fps MV with 76.0 grains of AA-2230.
Minus 14 fps for instrumental = 2218 fps.

No Labrador

On June 11/19, temp 70*F, Rem brass, WLRM primer, 82 grains H4895 (max), 3.585" COL, Ruger No.1H 24" = 2353 fps/5900 ft-lbs from a 480 DGX, corrected to MV with Chrony at 15'.




Bob
www.bigbores.ca

Sir Bob,
That is a great .458 WM+ load. Buy a donkey for that contribution.
Seating depth is about a quarter inch, with a DGX-Bonded 480-grainer.
Might be close to a tight fit in the .458 Lott throat.
If one used the factory cannelure for a .458 Lott the COL would be about 3.500".
Better advise any Lottites to use caution with your excellent .458 WM+ load,
and be happy with their lesser loads for the .458 Lott.
.458 WinMag beats all, in the all-around contest.

That .458-575 gr. CEB Lazer has a form factor about like the .510-750 gr. Hornady A-Max.
The Hornady has a sectional density of 0.412 and G1 BC of 1.050
so the CEB with sectional density of 0.392 ought to have a BC of about 0.999, close to 1.000.
That is if the SealTite Band (STB) sticking out there does not cause too much drag.
TBD/"To Be Determined" as they say at CEB ...

Yessir, CFE-223 in the little 400 Whelen was fail safe at 100+ degrees accurately placing the 400gr Woodie softs/solids and well within pressure limits at 2255 fps, PH proclaimed it to be the perfect low bush-veld all game rifle, because of vegetation, 200 yards is the absolute max range, Pac-Nor will have a hell of a barrel for your new Ruger #1 "Antii-Material Rifle" ..............it'll be fun to see what you realize with that beast.

Been lurking on this thread for while, has any one used the 425 gr. hard cast on game? I don't have a 458 Win Mag. But do have a 450 Howell, I have been using 458, 350 gr. Hornday S.P. and getting along fine but I am about out of them, I have had these hard cast for a long time as back up. loaded these to try today. will shoot and chrno them in the morning. Rio7

My Gunsmith Father in Law used to drill a small hole in the nose of the Bullet, before I met him, and make his own Hollow points!

He was on a fixed income, from early disability Retirement, and Former WWII Veteran, and made ends Meet!

He told me that they found out the hard way using solid lead on game wasn't the best choice, although the shock of the bullet would do some damage,
his hollow points causing expansion of the bullet created a larger shock displacement, etc................ as we've learned today.

Yes sir I have used that mold's bullets on Game. The alloy I had weighed 433 but is of no matter. The work is done by that big flat point and it works fine on Game. Put one through, and I mean through because 99.99% of the time that is what happens, the vitals and you will have harvested what you shot at.
Good hunting!
F01

Winds hard here the last few days so haven't tested them, i use my 450-H mostly on Pigs, but have used it a couple of Whitetails, and

A couple of Gembok. I have never shot anything more than once, with my 450, it's deadly. Rio7