Washington State Obsevatory Unit bull, 300 yards with a 26", 14 twist barrel, muscle brake. Benchmark built 450 Ultra Magnum. Shooting a (.458 cal) 350gr Speer HotCore just shy of 2800 fps. It flat CRUSHED him to say the least. Dead right there, didn't even twitch after the shot. I recovered the bullet just under the hide on the off side, the recovered weight of the bullet was 248.4 gr.

Interesting wildcat - 450 UltraMag. I'm having a 416 UltraMag built (aka., 416 UltraCAT). I plan to use it in Africa on Cape buffalo, elephants, etc.

What are your plans for the 450 UltraMag. I believe the 338 RUM or 375 RUM would make better long range elk cartridges.

Regards, AIU

I already shoot a .375 Ultra Mag and a 260 Accubond.

This is a 260gr .375 bullet recovered from a mule deer shot at 560 yards facing me head on, the hit was center of the chest and I recovered the bullet near the pelvic bone.





I wanted a big bore but something out of the ordinary and I didn't want a factory offering. I like to do my own thing, I had PTG build me a reamer and RCBS do the dies. I haven't made any definite plans for the rifle in the future but it would be safe to say, depending on my bullets selection I can take anything on the planet with it.

What was the range? How fast do you think the bullet was going when it hit?

I'm using that bullet in my 458 Win Mag for deer this year. I was told that bullet is "too soft" for whitetail deer at Win Mag velocities.
Shoot a few more and let us know how it works.

quote:

Originally posted by SMACK!!!!:
I already shoot a .375 Ultra Mag and a 260 Accubond.

This is a 260gr .375 bullet recovered from a mule deer shot at 560 yards facing me head on, the hit was center of the chest and I recovered the bullet near the pelvic bone.





I wanted a big bore but something out of the ordinary and I didn't want a factory offering. I like to do my own thing, I had PTG build me a reamer and RCBS do the dies. I haven't made any definite plans for the rifle in the future but it would be safe to say, depending on my bullets selection I can take anything on the planet with it.

Smack,

I admire your independent spirit. That 450 RUM with be GREAT in Africa, yet you'd not likely notice much difference in field performance from the 375 or 416 RUM. Some PHs like the big heavy for caliber bullets shooting buffalo thru the bush - they say less deflection from hitting twigs, etc. between you and the buffalo.

Another topic - what do you think that 260 Accubond would look like if you shot that deer at 50 yrds head on? It mushroomed quite a bit at 560 yds, maybe it'd be a pancake at 50 yds, which could be a problem for penetration? Nosler says not to worry about the penetration issue with the Accubond and recommends no upper limit on velocity. Your thoughts?

Regards, AIU

Great looking gun! Did you build it or have it built? (maybe I missed that somewhere)

Greg

quote:

Originally posted by Ackley Improved User:

quote:

Originally posted by SMACK!!!!:
I already shoot a .375 Ultra Mag and a 260 Accubond.

This is a 260gr .375 bullet recovered from a mule deer shot at 560 yards facing me head on, the hit was center of the chest and I recovered the bullet near the pelvic bone.





I wanted a big bore but something out of the ordinary and I didn't want a factory offering. I like to do my own thing, I had PTG build me a reamer and RCBS do the dies. I haven't made any definite plans for the rifle in the future but it would be safe to say, depending on my bullets selection I can take anything on the planet with it.

Smack,

I admire your independent spirit. That 450 RUM with be GREAT in Africa, yet you'd not likely notice much difference in field performance from the 375 or 416 RUM. Some PHs like the big heavy for caliber bullets shooting buffalo thru the bush - they say less deflection from hitting twigs, etc. between you and the buffalo.

Another topic - what do you think that 260 Accubond would look like if you shot that deer at 50 yrds head on? It mushroomed quite a bit at 560 yds, maybe it'd be a pancake at 50 yds, which could be a problem for penetration? Nosler says not to worry about the penetration issue with the Accubond and recommends no upper limit on velocity. Your thoughts?

Regards, AIU

My experience is, I feel it would do just fine. I point blanked a Mulie at 20 yards in the chest with a hand load from a .270 WSM and a 140gr Accubond right at about 3200fps. The the recovered bullet almost looked identical to the recovered .375 260 Accubond. I recovered the .270 140gr Accubond just under the hide high on the Mulie's left rear hip. It is my experience that they only expand so much and are a very stout bullet. I have a feeling point blank in the chest with a 260 Accubond out of a 375 RUM @ 3000 fps And it's going right on through like freight trail. I'll have to try it to know for sure.

quote:

Originally posted by Greg Brownlee:
Great looking gun! Did you build it or have it built? (maybe I missed that somewhere)

Greg

Greg,

I was shooting a .375 Ultra one day and thought, I should neck this bad boy up to .458 and give it a try, I did consider .416 diameter but .458 won the debate for a mid range crusher. I had the reamer built by Dave Kiff at Pacific Tool And Gauge. The dies built by RCBS and ordered the 26" 14 twist barrel from Lilja. Then I sent everything to Benchmark barrels in Arlington WA and had them smith the complete custom rifle.

I went with a Harrel's brake the first go around but after a few bench sessions and having to peel my bloody t shirt off my should. I talked to some big bore guys that told me that brake wasn't working properly with the small hole pattern for my bore/ cartridge combination. So I sent it back to Benchmark and had the Harrell's replaced with a 4 port muscle brake and it made the rifle more manageable withe the 500gr class bullets off the bench.

Here is the first brake(Harrel's)



My shoulder after day one on the bench with the rifle and the Harrel's brake. Day two was worse, day one softened me up and day two hammered me!



This is the new 4 port Muscle brake with a extra port machined in the top and a set screw installed. Pictured with a 450 Ultra Magnum cartridge loaded with a 370gr CEB BBW#13 Non Convenional Hollow Point with a hi BC polymer tip.

A nice elk crusher wow cool ect

The rifle was built and chambered to shoot the CEB BBW#13 Non Cons. I just had a rough go making it all happen before my elk season. Broken scopes, trashing aluminum bases and rings, quick release rings failing. Just a pile of recoil issues, ran out of CEB's, had to rush to put together a load for my elk season. I almost left the 450 Ultra at home if it hadn't been for the 350 HotCores shooting so well. The CEB's BC dwarfs the 350 HotCore. I'm also going to give a assortment of custom Hawk bullet spire points a try.

Here is a little closer look at the CEB BBW#13 Non Con hollow point. I'm also going to order and try some of the 420gr CEB's

CEB should have the new ESP Raptors, double ended BBW#13 nose profile with FN Solid one end and HP NonCon the opposite, available along with the tip inserts in the next month or so – 230gr in .375 caliber and 350gr and 400gr in .458 caliber. They should work very well in your Ultra Mags.

quote:

Originally posted by capoward:
CEB should have the new ESP Raptors, double ended BBW#13 nose profile with FN Solid one end and HP NonCon the opposite, available along with the tip inserts in the next month or so – 230gr in .375 caliber and 350gr and 400gr in .458 caliber. They should work very well in your Ultra Mags.

I used the Speer 350 on two whitetails yesterday from my 458 Win Mag. The buck was through the neck, any bullet or would have had the same result.
The doe was a better test of the bullet. The doe was walking almost straight toward me down a steep hillside at 50 yards. I hit her in the back of the neck near the shoulders. The bullet it the spine at a shallow angle and kept going relatively straight, exiting at the rear of the rib cage. The load was a middle load of IMR 4198, less than an Ultra Mag, more than a 45-70. From your experience and mine, I won't be afraid of Full power 458 mag loads with this bullet.

quote:

Originally posted by SMACK!!!!:
Dead right there, didn't even twitch after the shot.

I'm not surprised. That's a mighty big hammer for an elk.