.458 Remington Ultra Mag

[AZDAVE]

Where did you get the brass peen made? I need on for a 416 WSM and 458 B&M.

 

[hoytcanon]

Where did you get the brass peen made? I need on for a 416 WSM and 458 B&M.

Infinimark Enterprises, Canoga Park, CA, 818-576-1121
Att; Noelle Blackshear, as she is familiar with the design requirements for cartridge peens (Bunts).

Infinimark Enterprises, Inc.

infinimark.com

Note; the peen (stamp) is the same diameter as the cartridge head, I will be modifying mine with a sleeve that keeps it aligned over the case... the sleeve can be epoxied on. This will aid greatly in keeping it in place and perpendicular for the strike more than just with the pilot protrusion that fits into the primer pocket.

 

[AZDAVE]

@hoytcanon Thank you! I will contact them.

 

[Simon Catinski]

I've been tossing around ideas for the Model 70 Classic in 300 RUM I have, and remembered a gun my brother owned briefly back in '09 or so and that I had a dummy round still on hand.

View attachment 593002

A guy had it built for a dangerous game hunt on a R700 (I know, the horror). It had this cheesy single stack plastic mag extension that would dump all the rounds every time you fired. I fired it once from standing and really wasn't too bad for a 9ish lb rifle, but it was braked. Anyways, it sure looked good and fed well in the M70 action!

View attachment 593003

I was a little suprised to not find more on it while searching last night. I found one reference to a .458 RUM and another for a .458 Super Cat. I'm assuming a bit more power than necessary and lack of properly headstamped brass is at least partially to blame.

Look up .458 Imperial Mag In Cartridges of the world. That’s pretty much what you have there.

 

[Simon Catinski]

I've been tossing around ideas for the Model 70 Classic in 300 RUM I have, and remembered a gun my brother owned briefly back in '09 or so and that I had a dummy round still on hand.

View attachment 593002

A guy had it built for a dangerous game hunt on a R700 (I know, the horror). It had this cheesy single stack plastic mag extension that would dump all the rounds every time you fired. I fired it once from standing and really wasn't too bad for a 9ish lb rifle, but it was braked. Anyways, it sure looked good and fed well in the M70 action!

View attachment 593003

I was a little suprised to not find more on it while searching last night. I found one reference to a .458 RUM and another for a .458 Super Cat. I'm assuming a bit more power than necessary and lack of properly headstamped brass is at least partially to blame.

.458 Imperial Magnum, AKA .458 Canadian Magnum. https://cartridgecollector.net/cartridge/458-canadian-magnum/

 

[kfreeze]

358 STA was my first "big gun". I had a Browning A-bolt in 300 Win that I rebarreled with a Douglas. I kind of wish I had it back, but I keep in touch with the guy I sold it to and I still have a soft spot for that chambering.

We'll see how the gun does in the classifieds. Building high dollar right handed rifles is always a safer bet, but I have a lead on a left handed Montana in 300 RUM that I'm thinking seriously about.

Michael, do you have any experience with the ADG .375 Ultra Mag brass? Supposedly they make their brass a little thicker so I wonder if that would complicate the kind of stuff you do or compliment it.

Older thread, but I wasn't impressed with ADG ultra mag brass. It showed pressure signs at book start loads. After I saw that, I went on long range hunting forum, and saw that others noticed the same. I would start with peterson brass for ultra mag. It was only the ADG ultra mags guys were not as happy with though.