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Joined: Jun 2007
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Originally Posted by CZ550
I don't think you intended to say what you did: "The Barnes manual only lists data for 1 or 2 powders per bullet." Actually, they list 6 powders for each of the 4 bullets designed for the 458 magnums.


I agree and stand corrected. The powders listed are not one's I've ever used and I didn't have it in front of me when I posted. I remembered that I thought it was useless.

It would have been more correct to say that the powders listed are limited and, in my experience, not common. I'm biased in that I've been disappointed by the Barnes Manual all along.


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Certainly is a lot of "passion" here over the .458! That's a good thing! It helps keep our sport alive.

I have a CZ in .458 Win., and as CZ550 noted, the throat is unusually long in those rifles, allowing the handloader to seat bullets farther out. That pretty much eliminates the compression issue. Mine loves 72 grns. of H4895 under the 450 grn. TSX. This load gives me a consistent 2225 fps., and 1 1/2" groups at 100 yds., and shoots to the same point of impact whether it's 100 degrees or 15 below. While I have never killed an animal with this rifle, my common sense leads me to believe this load would be up for any challenge that presented itself, and I would be confident in it.

Keep the passion guys! I've enjoyed the read!

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I was looking for loading data for the 458 Win and 2230 and I found this thread... what a great read... I am a novice with the 458, I have a 458 Win Mag built on a long (375 length) Sako action with a 22 inch Mag-na-ported barrel. I loaded some 450 TSX bullets with H322 a grain or so over published max ( I seated my bullets out exposing the first band)and used them on a nice bull moose at about 150yds. They performed excellently and I even recovered one that passed through about 6 ft of moose! I am very impressed with the 458 and find it much nicer to shoot than my 300 Weatherby!!! I got it because we have very large brown bears at extremely short ranges here and you can't have too much gun here!!

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Old Ray sure did give me some belly laughs while reading thru this old thread..Guy was so full of $hit..

Gems like "I was hunting in Africa when you were still on the tit" While in the early days of internet forums Ray wrote that his first trip to Africa was in the late 90's..The guy was a bag of wind.

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Glad you liked the thread. CZ550, who used to post here, did a lot of work on the .458 and published a booklet about four years ago. Perhaps you can PM him. He also has a blog: www.bigbore.ca. Lately he's been experimenting with the 9.3x62.

Since 2008, I did some other work and concluded two things:

1. AA2230 is the best powder for heavy bullets though H335 is close.

2. I can get 2700 fps with the 350 grain TSX and no pressure signs (but using H4198. Unfortunately I cannot get this bullet to impact in the vicinity of 450 grain bullets. So it's use one or the other, depending on the game, on any particular hunt.

You should also read the nearby thread on using the .458 for plains game.


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Informative thread Indy, I haven't used the AA2230 powder but get an easy 2150 fps with H-322 and 500 gr bullets in my old 24" barreled tang safety Ruger African.

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72gr. of AA2230 and any of the North Fork 450gr. bullets or a 450gr. Barnes FN Solid is where I stopped! No need for anything else.

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Been thinking about the 450 gr TSX's for everything 458 FOst.

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Am thinking that it's going to offer a bit of "over-penetration" on these East Texas white tails, but I'm going to use my .458WM anyway. grin

Ed


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A "BIT" of overpenetration? LOL

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My first hunting load for the .458 Win was 74 grains of H4895 under the 450 grain A-Frame in Win brass. It was compressed so heavily that seating the bullets collapsed the odd case. Velocity was a tiny bit over 2200 fps, and groups would cut cloverleafs once in a while. 10 Australian buffalo dropped to this load.

When I finally got some A2230, the same velocity was achieved with 74 grains and no compression to speak of. Pressures seemed very mild, so I creeped the charge up a grain at a time until I got to 2350 fps at 78 grains. The same 9 cases were loaded 6 times apiece at this level, extraction was effortless and the primer pockets were still tight, but anyone trying that load is on their own.

Still haven't shot a buff with the faster load, so whether it will make any difference is debateable.


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AA2230 is definitely the powder for the .458 in my opinion and experience. I like 72 grains with a 450 grain North Fork solid or TSX (depends on application) bullet. 2250 fps in a 22" barrel. You don't need more. I killed an elephant and a buffalo with that load.

Caution: It was safe in my rifle but maybe not in yours. Work up slowly.

I don't understand why the factory ballistics are so lame.


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