505 Gibbs load data

shooter93

I'm looking for some load data for the 505 Gibbs using slow powders....7828 etc.....535 and 600 gr. bullets. Everything I found googling listed faster powders using fillers which I prefer not to use if possible. Thanks.
Scott

nononsense

shooter93,

That's because of the size of the case and lack of slow powders when so much of the development work was going on. Loads that feature the slower powders are noted for their drastic inefficiencies, most wasting somewhere between 10% and 15% of the total load. That can amount to 21 grains of powder wasted on each shot. Here is one batch:

http://reload.thor420.com/505gibs525gr.htm


And something slightly different:

http://gunloads.com/modules.php?name=Gunloads&cmd=Gunloads&did=389

And some more:

http://www.lima-wiederladetechnik.de/505/505-Magnum-Gibbs-Loads.htm

These folks are diehard Big Bore shooters and they have a forum and links:

http://nitroexpress.com/

You can call Hodgdon and ask for some data using their Retumbo powder which I think is pretty good for this cartridge and the 600 gr. bullets. You might also check on their US869 powder as well.

Best.

shooter93

Thanks....I figured as much and most of the load data I have is from that time frame.