.577 TYRANNOSAUR and .585 NYATI owners...!

What barrel length do you have on your rifle???

Per577..!

How long is the barrel on Ulriks .577 TYRANNOSAUR

Thanks...!

28 inches including brake.

To get the velocities you are after, I suggest 32.75 inches.

Overkill.If i haven't already mentioned it, Ulrik has a 24" barrel in his hannibal rifle.

Per577...!

I have forget that

If Ulrik get 2750 f/s with 750 grain solid bullets in a 24" barrel what velocity do you think can be possible with a barrel lenght of 28"

OK from what I have been told you can add 30-40 fps for every inch longer and subsequently subtract 30-40 fps for every inch you take off.

Thanks to all!!! I learn a lot with your responses.

Thanks again!!! Nicolas Carone (from the bottom of the world)

PC...!

So you mean that 1 Inch longer barrel will give 30-40 f/s more. Yeah i have read it some were my self.

Per577...!

If the velocity go up 30-40 f/s for 1 inch longer barrel. Then if Ulrik get 2750 f/s with 750 grainers in his .577 TYRANNOSAUR with a 24" barrel. Then the velocity would be 2870 in a 28" barrrel if the velocity is going up 30 f/s of 1 inch.

Overkill - The pressures will be far beyond safe i think, and iwould never pull the trigger,cause even in a strong action and good brass(horneber)this can not tell you wether you should cease fire or continue firing loads like that(750 gr.solids at 2700+ fps velocities).I think loading 750 grainers, barnes mono sol. at 2715 fps will develop some psi's in the area of 80.000-90.000 psi, thats just a guess. Maybe experienced handloaders will reduce pressure by knowledge,,in seating the bullets right to get the most out of it,,and equipment like a drop tube that will fill the case up totally and uniformely,,,like mitch with his .500 A2 and 136 gr. of imr-4350,,,,and that i thoght was impossible !Powder is also an important factor,,,where vith.550 and 560 seems to get the most velocities out of the .577 Tyr,,and the good old imr-4350 for the .460 Wby.
Even tough 750 gr.at 2500 fps will get your attention pretty soon,,and it does make you consider something of less power after the first shot,,,so i must admit that discussing 750gr. at 2700+ is silly,,period,,,,on the other side it make a person feel more safe, even that seem obscure,,and so on the person may feel he gets more "power" so the harsh reality could be put to a distance. The rifle symbols power over life and independency and safety, so this could maybe be the explenation to why someone would even consider having their collarbones broken,he,he.Or maybe it is just for the kicks, but even then a .460 Wby is more than enough.

Per "psychologist"577

750 grains at 2100 fps is plenty for any hunting.

Per577...!

How can the pressure be higer in a longer barrel

If you use the same load in a 24" or 28" barrel how can the pressure be higer in the 28" barrel.

Overkill. I said nothing about how loads will raise 'cause one adds 2 or 4 inches !?
And i've heard no talk about the subject in any of the books,mag. that i've been reading.Cannot give you the proper answer to that, sorry

As 500 grains pointed out - a 750 grain bullet at 2100fps is all you need for any hunting on the planet.

Accordingly, I don't believe that you need a long barrel in the .585 Nyati. A good friend of mine has a .585 Nyati and he has just reduced the barrel length to 23 inches after playing with 26 inches. At 23 inches the rifle is more 'pointable' is less muzzle heavy and produces all of the performance anyone can possibly used.

I have a .585 Nyati under construction and I am planning on making the barrel length 22 inches and I am certain that I can achieve all the performance I what and will have a much more shootable rifle. I intend for this rifle to be a true hunting rifle and will be taking it to Africa and to the Northern Territory when it is finished - I am not building a 'range only' rifle nor a talking point so I am thinking about long days in the field and the problems of shooting big, nasty animals at close range in thick bush!

I am also a firm believer choosing calibres that allow good performance at relatively low pressures. This provides, not only a big margin for safety, but longer case, longer firearms life and a lot less strain on my wallet! Cartridges like the .585 Nyati allow us to achieve performance in excess of the likes of the .577 Nitro but still within what would be termed 'low pressure'.

I believe that we are, all too often, seduced by the lure of higher velocities and performance at the expense of logic and sensible practicalities. The firearms manufacturers, and some gunsmiths, prey on this trait and we need, from time to time, to step back and ask ourselves 'what do we really NEED from this rifle?' before committing ourselves to a path that later proves to be impractical.

OK, mine will be 27" including break.

You are all forgetting some important points! The NYATI is not a PRACTICAL hunting round IMHO. Not even for those savage Swedish bears! Other than 500 grains, I don't personally know anyone who has really hunted dangerous game with one. The brass is paper thin and if droped easily dented and at full power the recoil can set the almost negligible shoulder back so it won't feed. Crimping makes the situation worse! You can't even build one on a reasonable action that will hold three rounds in the magazine! With any barrel length it kicks like a mule and few people are going to be able to recover fast enough for a rapid second shot. Yes, you can load it way down to .577NE ballistics, but then you simply have an unreliable .577 NE clone. Since I got into this cartridge I seen at least 5 NYATI's built by gunsmiths who didn't have a clue!. Each of these folks have called me to help sort out one problem or another usually involving failure to feed/eject and split stocks. Heck, half of these even use the .590 rim which we have learned the hard way doesn't work! After firing one, most people will be so afraid of the recoil that they won't hit anything anyway. It would be fun for Pigs and such like PC is building one, but for dangerous game in Africa not me! Shorter barrels will decrease the weight of the gun significantly which is no help at all in this caliber. Mine has a 28 inch barrel which includes a integral muzzel brake. Let's face facts, this is a stunt cartridge that was badly designed in the first place and only deserves to live because it is possible to build one and it will deliver astonishing power in a small package. It is fun at a nice safe range where you can rod-out the jams! When it comes to actual hunting a 500 A2/AHR etc. is the practical limit. There have also been way too many documented failures on game of .577 T-Rex's etc to make me even think about taking one to Africa. I'm going to Zim next month for buff again and I think I'm just going to take my trusty 450 Ackley. It holds four down and I'm a real believer in 500 grs at 2400 fps. Sorry if I am bursting any bubbles, but the whole T-Rex/ NYATI thing is getting boring!-Rob

First, barrel lenth has nothing to do with pressure, at least not enough to matter one way or the other...pressure decreases as the bullet moves forward because it creates a bigger chamber for expanding gases...

I like long barrels for one reason only, they balance a rifle for off hand shooting, any other difference is of no practical value in the hunting field....with a 750 gr. bullet a couple of hundred FPS in either direction is of no importance...