I just had a new run of 577 T-Rex brass made and have it for sale as un-primed cases. We are also building rifles; I have four going at the moment. The brass turned out better than I could have hoped for. The dimensions are spot-on to original A-Square brass, and after shooting it, I think it is stronger than the A-Square or the Horneber. I've taken it to 2,580 fps with the 750 gr. CEB flat nose solid, that's 11,000 ft/lbs. of muzzle energy, before I ran out of room for powder.

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Finally! Someone had the foresight to revive this monster! :-)

Can I get it in a little field gun that tows behind a four wheeler?

Amazing!

We also ran out at 2581 fps!!!???

The A-Square brass is too soft, and we do have some Horniber brass, but have not tried it yet.

Best of luck.

Help me out here...the top brass looks like it doesn't have a belt, the bottom horizontal looks belted and rebated.

quote:

Originally posted by BaxterB:
Help me out here...the top brass looks like it doesn't have a belt, the bottom horizontal looks belted and rebated.

The 577 T-Rex brass is propped on the butt end of a 600 Overkill case.
Advertising two birds with one stone.

I started thinking what I could wildcat that brass into, something smaller in caliber.
Then I went and laid down and the urge went away.

THE FEW THE PROUD THE 395 FAMILY
Rip

RIP, you are correct; sharp eye.

Saeed, have you tried Vitahvouri N550 yet? I want to try that next. I was using H-4350.

186 grains of VVN 550 give us 2581 fps!

quote:

Then I went and laid down and the urge went away.

I wish I could learn to do that :-(

What is the price?

quote:

Originally posted by RIP:

quote:

Originally posted by BaxterB:
Help me out here...the top brass looks like it doesn't have a belt, the bottom horizontal looks belted and rebated.

The 577 T-Rex brass is propped on the butt end of a 600 Overkill case.
Advertising two birds with one stone.

I started thinking what I could wildcat that brass into, something smaller in caliber.
Then I went and laid down and the urge went away.

THE FEW THE PROUD THE 395 FAMILY
Rip

Gracias.

The price is $7.95 each. Less if you order a rifle with it :-)

I'll bet this will generate some more build orders for T-Rex rifles for you.

Bitterroot,

Who made that brass that is better than Horneber product?
That is quite a good recommendation.

quote:

Originally posted by Saeed:
186 grains of VVN 550 give us 2581 fps!

577 T-Rex 750-grainer Velocity Competition:

Wayne: 2580 fps with H4350 XXX grains
Saeed: 2581 fps with VVN550 186 grains

One-up-manship by a whole 1.0 fps!

No mention of respective barrel lengths for those velocities?

We'll give 25 fps credit per inch of barrel length discrepancy, + to the short barrel, - to the long barrel for a fair comparison.

And Saeed was using VVN550 which Wayne has not tried yet?

This is gonna be a nail-biter!

THE FEW THE PROUD THE 395 FAMILY
Rip

Mr. Bruce Bertram made the cases to my specs and fit to the case gauge I supplied him. They hold a little less water capacity than the A-Square or Horneber so this is probably adding to their strength. The case gauge was made from my reamer so the cases fit my chambers perfectly. The dimensions are also the same as new A-Square brass that I have.
I am shooting a 26" barrel right now mounted on a Granite Mountain Arms African magnum action. I'm only using 175 grains of H-4350 compared to Saeed's 186 grains of N550. Saeed must have a shorter barrel. Usually N550 will give me more velocity with lower pressures using the same amount of powder. Don't know what bullet he's using either. I'm using the CEB solid which takes up a lot of powder room. I'll be trying some Woodleigh softs soon and see how they perform.

I am building another T-Rex that will be a real monster. 30" barrel, 1.4" diameter straight taper, and as heavy as I can make it. Actually it will be a set of three matching rifles; one in the T-Rex, one 600 OK, and one 700 AHR.

quote:

Actually it will be a set of three matching rifles; one in the T-Rex, one 600 OK, and one 700 AHR.

Wayne, cash his check before the guys in the white coats show up :-)

quote:

Originally posted by RIP:
Bitterroot,

Who made that brass that is better than Horneber product?
That is quite a good recommendation.

quote:

Originally posted by Saeed:
186 grains of VVN 550 give us 2581 fps!

577 T-Rex 750-grainer Velocity Competition:

Wayne: 2580 fps with H4350 XXX grains
Saeed: 2581 fps with VVN550 186 grains

One-up-manship by a whole 1.0 fps!

No mention of respective barrel lengths for those velocities?

We'll give 25 fps credit per inch of barrel length discrepancy, + to the short barrel, - to the long barrel for a fair comparison.

And Saeed was using VVN550 which Wayne has not tried yet?

This is gonna be a nail-biter!

THE FEW THE PROUD THE 395 FAMILY
Rip

I am using a genuine, original, A-Square rifle built by non other than Colonel Art Alpin himself.

It has a 23 inch barrel, shot hundreds of times, dropped literally hundreds of times.

It bears many battle scars, from breaking the stock several times, breaking the front sights even more times.

And best of all, it has been featured in the world famous CHAMPIONS videos, scattered all over YouTube.

We are using our own Walterhog 750 grain bullets.

So, there you have it.

No competition at all, ours wins hands down.

quote:

Originally posted by Saeed:

quote:

Originally posted by RIP:
Bitterroot,

Who made that brass that is better than Horneber product?
That is quite a good recommendation.

quote:

Originally posted by Saeed:
186 grains of VVN 550 give us 2581 fps!

577 T-Rex 750-grainer Velocity Competition:

Wayne: 2580 fps with H4350 XXX grains
Saeed: 2581 fps with VVN550 186 grains

One-up-manship by a whole 1.0 fps!

No mention of respective barrel lengths for those velocities?

We'll give 25 fps credit per inch of barrel length discrepancy, + to the short barrel, - to the long barrel for a fair comparison.

And Saeed was using VVN550 which Wayne has not tried yet?

This is gonna be a nail-biter!

THE FEW THE PROUD THE 395 FAMILY
Rip

I am using a genuine, original, A-Square rifle built by non other than Colonel Art Alpin himself.

It has a 23 inch barrel, shot hundreds of times, dropped literally hundreds of times.

It bears many battle scars, from breaking the stock several times, breaking the front sights even more times.

And best of all, it has been featured in the world famous CHAMPIONS videos, scattered all over YouTube.

We are using our own Walterhog 750 grain bullets.

So, there you have it.

No competition at all, ours wins hands down.

Yep,

Saeed is THE CHAMPION
in this contest so far.
Wayne has his work cut out for him.

However, using a stubby Woodleigh .585/750-grainer and VVN550 might allow him to pull out a win here.

But Saeed gets to add 75 fps to his velocity from 23-incher: 2581 + 75 = 2656 fps for 750-grainer

2656 fps

Wayne, can you beat that with your 26-incher?

THE FEW THE PROUD THE 395 FAMILY
Rip

[quote]It has a 23 inch barrel, shot hundreds of times, dropped literally hundreds of times.[/quote


Some owner have a bit Satanist in them.

Oh no, what did I get myself into?
It will be a while before I can shoot it again; gotta finish the rifle first. It's good to have the T-Rex back in the mix of ultra big bores. Exciting times!!!

I think Saeed's rifle has set a record for most time in the air. The videos are entertaining. Would I shoot it, don't know.

Dave

quote:

I think Saeed's rifle has set a record for most time in the air.

As I remember, the 3 recoil reducers that are standard have been removed on that rifle :-)

quote:

CHAMPION

Vestals shot 750gr with our 585 at 2778 from 22" barrel.

Wasn't a top load. If full load and right length barrel,

would be near 3000 and 15,000 ft lbs,..Ed

No doubt , awesome carts and rifles . I just have 0 desire to squeeze a trigger on one.
Now at 2100 fps . it should make a great working rifle.

Yeah these high velocities are good for one or two shots just to say you did it and survived. 2,150 fps is the sweet spot, very manageable and fun and easy on your brass.

I sold my A- square T-Rex and was glad just like the .600NE Heym to get rid of it. It frankly never impressed me. Ed's 585 would be my choice in .585. kudos to Bitterroot though in getting T-Rex brass made and available again! That was probably no easy task.

Folks how does the .585 HE Compare against the .577 T-Rex which is the more powerful round ?

Out of curiosity I measured the water capacity of the T-Rex case and the 585 HE. I just picked one new case of each, nothing scientific here.

AHR T-Rex case - 193 grains of water

585 HE - 197 grains of water

Horneber T-Rex case - 213 grains of water

Don't have an empty A-Square case to measure at the moment.

So, all else being equal (powder, bullet, barrel, action)...........

Apparently Mr. Bertram has some new machinery, uses it well on brass of proper metallurgy,
and AHR 577 T-Rex cartridge cases are the result.

THE FEW THE PROUD THE 395 FAMILY
Rip

Our 585 HE case fresh from factory is smaller than specs,

shoulder diameter is .022" under, fired cases here 210gr capacity.

Vestals Smithing built 22" barrel one with lapped Mcgowen mirror finish barrel.

And got 750gr CEB -- 2778 fps with load 5 gr less than max I've tested.

If full load in original 27" barrels that I have bunch here, would

have close to 3000. Straight case we can use full load H335 ball,

ball powder, can't do that in Trex case. We just lucked out..

My 585 load testing many years ago was big Enfield with a slow rough 28" long

barrel and I got 650 gr soft to 3000 and 750 gr soft to about 2800 max,

McGowen barrels are nice.Ed

Our 585 left, Trex right, inside cases are about the same diameter

and all extra brass in the sides relative to the

size of the case makes case that doesn't spring back real good,.

Rob can tell what that means as far as strong loads.....

Hornebers made with thinner sides

That is why our 585 case is doing great necked, for the 375 2 mile target cases,

they are springier and take high pressures and extract ok.

We lucked out..Case on left fired many times.Ed