Hi Guys, looking at load data for the 570g bullets in both "Any Shot You Want" and the "Barnes Reloading Manual #4" show the 500 Jeffrey maxing out at around 2250 fps and 38000 PSI.

Looking at the real guns web article on the CZ in 500 Jeffrey (which is what I have) gives much faster (and I assume hotter) load data, running the 500 Jeffrey up to modern pressures.

http://www.realguns.com/archives/157.htm

For example my Barnes manual lists 105g max of RL-15 with the 570g TSX at 2286 fps. The real guns article STARTs at 112g of RL-15 with the 600g Woodleigh PP.

Anyone used RL-15 or IMR 4350 with the 570g TSX in a CZ 500 Jeffrey?

Thanks,

Chuck

Chuck:

That data in the real guns article is really hot. The purpose of that article was to test the LIMITS of the .500 Jeffery when loaded to modern pressures like those shot in the .500 A-Square. For example, with a 535 grain bullet, he STARTS at 118 grains of Reloder 15. With that same bullet, I shoot 110 grains, maybe 112 max. I think the recoil generated buy those loads would be way to much for me. For me anyway, I will stick with the more traditional ballistics. They provide wonderfully low pressures and will kill anything that walks the face of the earth. I never even saw any need to more up to the 600 grain bullet. I shoot Woodleigh and Barnes 535 grain solids and I think they will shoot through most any game animal and do so with a lot less punishment to the shooter.

My 458 Lott 500gr bullet goes 2280fps. The solid goes 2350fps. I use IMR4320 powder. 85 grains. I'm not saying this powder would work for you. I got my load dada from Steves Loads.

Reloading pages here on AR give 570 gr Barnes X with 105 gr of IMR 4895 for a velocity of 2250 fps....in case you hadn't seen that. I'm with Dave, I load RL 15...110 gr with 535 Woodies for right on 2350 fps out of a 24" barrel. Have used 105 gr of Varget with the same bullets (got that from RIP)...with very good results also. I should think that dropping back to about 104 gr of RL 15 with the 570 gr bullet and working up should be fine.
No reason to hot rod the 500 Jeff IMO....it worked very well at the original speeds....and my body can't take too much more from an 11# rifle....at least from the bench.

Gary
DRSS
NRA Lifer
SCI
DSC

Thanks Dave and Gary, that's what I thought. I have H4895, RL 15 and IMR 4350 in house. My two loading manuals list:

(Any Shot You Want)

101g H4895 570g A-Square Solid 2300 fps (MAX)

and

Barnes Reloading Manual #4

105g RL-15 570g Barnes TSX 2286 fps (MAX)

Both are using 40,000 PSI as max.

I loaded some 570g TSX's with 95g of H4895 chron'd at just under 2100 fps. It was already starting to get my attention off of the bench ... I'm thinking 2150 fps with a 570g TSX or 600g Woodleigh PP should be enough ...

Chuck

Chuck:

2150 with a 570 or 600 grain bullet puts you rith up there with the .500 NE. That should do it alright

Thanks Dave,



Chuck

quote:

Originally posted by chuck375:

(Any Shot You Want)

101g H4895 570g A-Square Solid 2300 fps (MAX)

and

Barnes Reloading Manual #4

105g RL-15 570g Barnes TSX 2286 fps (MAX)

Both are using 40,000 PSI as max.

A-Square specifies 41,364 CUP not PSI as the max allowable pressure.
That is equivalent to 47,170 PSI Piezo PSI.
And that is very close to what CIP recommends as max average chamber pressure allowed for the 500 Jeffery:
3300 BAR
47,850 PSI

The A-Square load chuck375 shows above has a pressure of 38,900 CUP.
That will be well over 40,000 psi. Probably about 44,000 to 45,000 psi, but still sub-maximal.
Barnes does not say anything about their pressures but it looks like they must be staying under the CIP/A-Square max.

RIP (Ron Internationale Permanente) max average pressure for the 500 Mbogo-Mobogo (the mo' betta 500) is 60,000 Piezo PSI.
Surely CIP (Commission Internationale Permanente) will soon be listing 4138 BAR for the 500 Mbogo.

Thanks RIP, I plan to stay within the A-Square and Barnes loading manual limits. No reason I can think of to go faster. Thanks for the correction on pressure too.



Chuck

Chuck375,

I have no data for the 570gr TSX, but with Woodleighs of that weight IMR4350 should get you over 2300 fps while staying under 47500 psi with some powder compression, which in the Jeffery can be a good thing.