quote:

---

Originally posted by Mitch:
MLindsay, The 500 A-Square would be your best bet. Because there is plenty of good quality reasonably priced brass available for this cartridge, unlike many of the other 500s. All you have to do is neck up 460 wby. brass. The 500 A2 is a very powerful cartridge that can push a 600 gr. bullet to 2400 fps. with no problems. I own a 500 A-Square that I had built on a Weatherby Mark V action and I have been happy with it.

---

I have problems with my 450 Ackley as far as case capacity with 500 grain X-bullets. Do you have experience with X-bullets and your 500 A-square.

[This message has been edited by Mitch (edited 10-10-2001).]

[This message has been edited by Nickudu (edited 10-11-2001).]

I'm not inclined to accept this conclusion, because it seems to me that there can't be much difference between filler and 4 or 5 more grains of bullet. I feel I have to trust the people with pressure guns and statistically significant data, though.

As far as a 500/460 shooting 570's at 2400, I would think that would be nearly maxing out what the round would do, and I wouldn't think there would be a faster powder that would achieve those speeds, and signifigantly reduce recoil. Lets face it, if you are going to push a 570 gr bullet 2400 from a rifle, its going to push back. I am intriqued with that combo though, and it is my goal load for my 500 jeffrey, whenever it gets finished.

If you are concerned about recovery time and are planning on launching a 570 gr bullet at 2400 fps you must be planning on having one heavy rifle!

I have a 500 AHR and recovery time is nowhere near as fast as with my 416 Rigby. Even with the muzzle brake I cannot match the recovery time I get with the Rigby. My hunting load by the way is a 570 Woodleigh at 2475 fps.

One important question you may need to ask yourself is how much power you truly need. The 500's kick very hard; therefore, recovery time is greatly reduced.

By they way, my recommendations in the 50 caliber bracket would be the 500 AHR or the 505 Gibbs.

Todd E

The BRNO action is excellent with the proper gunsmithing.

The 500 A-Square or .510/460 Long type cartridge is the best way to go for many reasons.

The 505 Gibbs, 500 Jeffery, and 500 AHR all have larger case capacity. Unless going with the rebated rim Jeffery case, you really ought to get a Dakota or bigger bolt diameter for those monster rims. I hate seeing a CZ or BRNO opened up in the bolt face to 505 Gibbs diameter, though it can be done.

The .510/460 is the most efficient at delivering your goal ballistics with the minimum fuss all around: a full case of the most accurate RL-15 at the least charge weight to produce the desired velocity with the least recoil and safe pressures, below 50,000 PSI, I believe. Refer to the A-Square Manual, still one of the best books out there.

The only negative about it is that it head spaces on the belt. This is no more a negative than it is for the 458 Lott. Feeds fine in my gun.

------------------
Good huntin', shootin', and spear chuckin',
RAB

I currently carry a 450 Ackley in my journeys and it has done everything I need but!!!! I guess I want something new and researching and tinkering is wonderful.

What brought this discussion on was the info on the 505 loads. The recoil data found here gives it a rating of 1623.3 which is barely higher than my 450.
I know 570 grains at 2400 will push back but if there is a load technique available that will decrease that I don't mind trying it.
Plus my buddy from Cameroon is giving me a Brno 602 with the 3 position safety installed and some other bells and whistles.

Thanks,
Karl.

Jiri

Haven't been to Africa yet with this rifle. I have shot an American Bison and a Moose with it though. Bullet performance was good although I did not get to recover either bullet. The effect on the animal was devasting, they just fell (or should I say got knocked) over. Both one shot kills through the shoulder/spine complete penetration. Bison around 100 yards, moose around 150 yards.

Jiri,
I hesitate to publish loads, that said this load is safe in my particular rifle and is;
132.5 grains of IMR 4350 with a 570 grain soft point Woodleigh. I don't remember the min/max velocities and I am too lazy to go and look them back up. I have no pressure measuring equipment, but there are no signs of pressure with the case. Barrel length is 27 inches.

Todd E

As I stated earlier the 500's push back somewhat more than any 458 variable. For reference I have owned the 500 AHR, 505 Gibbs, and a 460 Weatherby and others. Of those the 500 AHR (my load) is the worst, the factory loads for the Gibbs are not that bad actually a little less severe than the Weatherby. The load that you describe 570 grain @ 2400 fps will kick pretty darn good in a 11 pound rifle. If your rifle weighs in at 13 pounds or so the recoil will be much more manageable. Futhermore, have you length of pull as long as you can comfortably handle and use a long barrel. Short barrels mean muzzle flip plain and simple. The LOPs on both my AHR and my Gibbs is/was 14.75" both sporting 27" barrels. The Weatherby was a factory stock MkV. The AHR and the Gibbs both pushed pretty much straight back and were very controlable during recoil. Additionally, you can incorporate a cast-off as well.

Todd E

[This message has been edited by Todd E (edited 10-13-2001).]

1. There is no muzzle blast due to the long tube. At least there is no muzzle blast that I can detect. Perhaps the recoil is distracting me.

2. The recoil will push my shoulder back a foot, but there is no muzzle rise to to a pretty good express stock.

3. The recoil is about like a 12 gauge 3 inch magnum turkey load, or maybe the 3.5 inch version.

4. Second time I shot this rifle, at shot #18 my nose started to bleed.

5. I have a 14" LOP and there is NO danger of the scope hitting my forehead, due to stock design.

6. 20 rounds per day is max in this rifle.

7. I have shot some groups under 1" at 100 yards with this setup.

Based on the above, I think that a 13 pound 500 jeff, 505 gibbs or 500A2 would be reasonably comfortable to shoot.

Karl