Milsurp for big bores...?

[Idaho Sharpshooter]

I am building a 510 Kayser Express (510 Wells minus the stinking belt) and a 550 on the 505 Gibbs cartrdige case. Anybody got any thoughts on powder?

thanks,

Rich
:castmine:

[swheeler]

ISS; I have no experience with either caliber you mention, but I'll bet not many do. It would seem to me that surp-powders 4895 and 4475 should be about right, and in ball powder maybe special ball(H380 speed)
With the case capacity, groove dia, barrel length, and bullet weight there are several people on here with software to give you starting loads, Bass Akwards can give you estimated pressure with the data.
Scot

[Buckshot]

..........swheeler is right. In most any straight walled rifle case you're going to want a medium to medium-slow powder. THE powder for high intensity loads in the 45-70 is IMR3031. However I'm also going to say I really have no idea of the capacity of the 505 Gibbs. I believe 45Nut has a 505 Gibbs and would have some insight.

The safest way if there isn't any or much data, is to start with something real slow, then work backwards (faster) till you see the ballistics you want or pressure signs. By the time you get there you should be plenty slap happy from recoil :-)

................Buckshot

[frank505]

I my 505 I shoot a 600 grain gas check with 140 grains of WC 860 for 2000 fps. I do not want or need any more than that. It does kill very well. I also use 125 grains of Re 25 which I have not chrono'ed. This in Bell brass and jamison. The aussie stuff is junk DO NOT waste your money on it.

[Idaho Sharpshooter]

thanks Frank505. I have just been shooting 650gr bullet w/120gr 7828...2030fps mild recoil.

Rich

[9.3X62AL]

thanks Frank505. I have just been shooting 650gr bullet w/120gr 7828...2030fps mild recoil.

Rich

Mild recoil.......remind me to NOT ask you for weather reports, all right? :-)

[45nut]

Actually my rifle is a 500 ASquare..460 Wby necked up to .510
My favorite plinking load is the Lyman 515141 over 110grs of H 870. My H 870 supply is getting low however.
The next load level is a 725gr NEI design over 100grs of IMR 4350.
Recoil is there,but due to the muzzlebrake can be handled quite well standing,I installed a Williams peep after this picture...
http://home.earthlink.net/~chevyken/sitebuildercontent/sitebuilderpictures/500.jpg
http://home.earthlink.net/~chevyken/sitebuildercontent/sitebuilderpictures/web500a2recoil.jpg

[swheeler]

Complete Reloading Guide

Published Data
.510 Wells Magnum
600 gr FMJ
IMR 4320-105.0 grs-FC215-2150 fps
IMR 4320-109.0 grs-FC215-2210 fps
IMR 4320- 114.0 grs-FC215-2350 fps

IMR 3031- 100 grs-FC215-2300 fps

[tom barthel]

There is an attorney down in Texas who uses .45 watts to hunt rabbits. Why? Because he wants to. It's good to be different.
I'm into mild calibers.

[swheeler]

Here's what I found published on the 505 Gibbs, you should be able to work up a start load for your wildcats

505 (rimless magnum)Gibbs
525 gr bullet
IMR3031- 95.0 grs-2250 fps
IMR4064-100.00 grs-2060 fps

[Marlin Junky]

Wouldn't DP 74 be just about right for heavy boolits in this particular .50? If I was loading for that cartridge, I'd be economy conscience.

http://www.powdervalleyinc.com/

Click on powders, then on Accurate Arms. DP 74 is the second from the top and burns like 4320. Post a picture of something being blown up by your .50 please.

MJ