BenchMark built custom 450 Ultra Magnum.

[magnanimous_j]

Have you shot it yet? That thing looks like it would blow my shoulder out of its socket.

[elkinrutdrivemenuts]

That is sweet man, did you come up with this caliber or has it been developed before? I have always wondered how much it would cost to create a wildcat caliber and build a gun around it, was it pretty spendy?  Can't wait to hear how it shoots and what kind of velocities you get out of her. 

[Huntboy]

Very nice looking rifle.

[Biggerhammer]

Got it out on the range today and broke the barrel in using 350gr Hornady interlocks with Win 748 powder. Started at 84gr and started working up checking for pressure signs or that slightly sticky bolt. Worked up to 97gr and I was still good with a velocity of 2842. The first eleven rounds, I cleaned the rifle after every shot. Using Hoppes Benchrest and a scrub with Sweets 7.62 solvent.

Here is a picture of the barrel break in target, cleaned between every shot. Powder charges 94, 95 ,96 and 97.




I did the math and came up with 94gr of Win 748 to start with for the 370gr CEB's, Loaded up 9 of them on the range. Fired 3 rounds to get my 200 yard zero. Then I fired two 3 shot groups at 200 yards that went  about 2" inches or less for both 3 shot groups(Average Vel 2640) By then the sun was around and directly in line with the target. I had fired 22 rounds total, that was enough for me for the day. I would have taken photos of the 200 yard groups but the range had filled up and I wasn't waiting around for the photo op. Bellow is a better look at the CEB BBW#13 370gr.




Yes, it does have some SERIOUS recoil, even with the brake. 15' out in front of the rifle the muzzle blast was constantly screwing up the chronograph.

[JimmyHoffa]

Sounds awesome.  Those velocities for that weight is great.  Now you need to find an elk to break it in on!

[yorketransport]

Very cool! I've seen the 458 done on an Ultra Mag, but never set up quite like yours. I like it! 

Those bullets have my attention as well. I've never seen anything like that before.

Andrew

[high country]

Given the looks of your ladder, you got a winner for sure. Any idea on the bc of the pills.

[Biggerhammer]

More Advil and fire forming today, I think I found my plinking, ground hog shooting and carp blasting combo. Shot this group today at 200 yards while forming brass. Going to give the same powder charge a try with the Barnes 350gr TSX as soon as they get delivered.

Tomorrow I work on 300 yard scope dope.

[50CalJim]

Sweet looking Gun. I feel sorry for whatever your shooting at though.

[demontang]

Looks and sounds like it kills on both ends lol. You do know dinosaurs are extinct right   

[Biggerhammer]

Well after 48 rounds the Vortex Viper crashed from recoil, along with my bloody shoulder.

[high country]

You are likely going to do like I did with my 7# 300rum w/o a brake......buy every scope made and then break them. I would have a bloody patern of the fabric come through my skin. Fwiw.....I never found a scope to last.  Good luck.

[demontang]

Yea that looks painful. And a scope might be a fun thing to find that will stand up to that round. I had a problem with a few scope just on my 338 win.

[carpsniperg2]

That is one outstanding rifle! Love the custom work stuff

[Biggerhammer]

Had enough of that Harrell brake doing absolutely nothing. My .375 Ultra sporter weight without a brake recoils less than my 450 Ultra. It's on its way back to Benchmark to have a 4 port Center Shot " Muscle Brake " installed. I figure if the 4 port Muscle brake works on the .408 CheyTac then it sure should work on the 450 Ultra. Should save me a bunch of trauma.

Yea that looks painful. And a scope might be a fun thing to find that will stand up to that round. I had a problem with a few scope just on my 338 win.