.458 American

Lassiter · Post by **Lassiter** » Wed Dec 30, 2015 11:21 am

Does anyone have any handloading data for the 458 American cartridge? I've found very little information on the internet. It's very similar to the 450 Marlin. The case is 1/10" of an inch shorter. I suppose I could use the 450 Marlin as a guide but thought I would pick the collective brains here first. Specifically I'm interested in 300 and 350 grain spritzer bullets. The rifle I've got is a side lever Mauser.

Merle · Post by **Merle** » Wed Dec 30, 2015 12:18 pm

It's been a while, but I "think" it was featured in cartridges of the world.
Also, have you tried to google it?
Many times that has worked for me.

Lassiter · Post by **Lassiter** » Wed Dec 30, 2015 1:08 pm

Yeah......I Googled it but about all I came up with was a history of the cartridge and one sight that had what looked to be a rather mild load of 23 to 25 grains of IMR 4198 for a 300 gr. bullet. The Speer manual #14 lists a load of 46 to 50 gr. of the same powder for a 300 gr. bullet in the 450 Marlin. I'm thinking that I could drop back to 42 gr. of that powder to start and see about pressure signs there.

JohndeFresno · Post by **JohndeFresno** » Wed Dec 30, 2015 2:45 pm

LoadData.com, an inexpensive subscription site, shows several loads from Rifle Issue 140 (1969).

Then, there is this from Reloader's Nest:
http://www.reloadersnest.com/forum/topi ... C_ID=16289

Lassiter · Post by **Lassiter** » Wed Dec 30, 2015 5:36 pm

Thank you, Sir! That is a lot of help!

JohndeFresno · Post by **JohndeFresno** » Wed Dec 30, 2015 6:12 pm

Lassiter wrote:Thank you, Sir! That is a lot of help!

You are very welcome. Careful - at least two of those listings appear to be max loads. What is your barrel length?
QuickLoad shows the cartridge, so I can send you a little extra help.

AJMD429 · Post by **AJMD429** » Wed Dec 30, 2015 6:22 pm

AmmoGuide.com shows loads for it, ranging from 2463 ft-lbs with a 350 grain bullet to 4005 ft-lbs with a 405 bullet...

Lassiter · Post by **Lassiter** » Wed Dec 30, 2015 8:20 pm

[/quote]
You are very welcome. Careful - at least two of those listings appear to be max loads. What is your barrel length?
QuickLoad shows the cartridge, so I can send you a little extra help.[/quote]

The barrel length on this one is 22" LoadData.com was a great help, Thanks. Anything else you can come up with will be gravy and greatly appreciated!

JohndeFresno · Post by **JohndeFresno** » Wed Dec 30, 2015 8:56 pm

Lassiter,
E-mail sent to you!

Cheers -
John

Lassiter · Post by **Lassiter** » Wed Dec 30, 2015 9:36 pm

Again......you don't know how much I appreciate your help!

Lassiter · Post by **Lassiter** » Thu Dec 31, 2015 10:42 am

I want to thank JohndeFresno for all the help he has been on this project. John you've helped me more than you can ever know and I appreciate it.
I knew someone on this sight would have the answers that I needed. A great bunch of folks reside here!

JohndeFresno · Post by **JohndeFresno** » Thu Dec 31, 2015 1:30 pm

Lassiter wrote:...A great bunch of folks reside here!

Indeed.

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