.600 Nitro Express, Mr. Darkhold? I don't think you've told the rest of us about this experiment of yours. If you recall, I've got a part-time job at a shooting range, so I am in a position to pick up used brass. Not that it's much help, as I've only seen one elephant gun in there.
Crap. I just did an image search on that thing. That is a very big bullet.

Hey if you are looking for something with lots of stopping power relitivly cheap ammo,more ammo capacity than an elephant gun(up to 10 rounds vs 2 at most for an elephant gun),and a less expensive gun ( Most of your .600 nitro Guns are custom works of art that will set you back A minimum of $10000.00 probably more, lots more!) As well as a hell of a lot more range.
look into the .50BMG. Ammo can be had at about $3.00 a round(if you buy in bulk; 500 round minimum)in most gun publications or on line. The gun that fires it will run about $1500.00 to $8000.00 plus optics depending on what you want, single shot, Bolt action or semi auto for a little more and if you got the right contacts or permits you can even go FULL AUTO!!!!.Ammo is also availible almost world wide.The Brass is also reloadable, the goverment sells it as scrap and the gun can be used to deal with things of a less than Supernatural nature. Vrey accurate shots of 1200 meters not a problem with the right optics, Infra red and Night vision optics are availible.The single, bolt action and semi auto guns are all man portable weigh about 34-38 lbs. and have about as much recoil as a 12ga shotgun with heavy loads.The Full auto gun is a crew served weapon and would require a crew of people (3-4) to move it around or a vehicle or stationary mount.

Only pointing out other options for lower cost more effective items that can be used in place of .600 nitro,which would also have the draw backs you mention.Also hearing loss is a problem you will run into with pretty much any firearm( yes even the lowly .22 will have adverse effects on ones hearing) and as stated in the first post the ammo(brass) will be magicked so has to take care of the over penitration and possibly the sound problems the bullets are mearly a carrier or focal point for the magics.
I do however agree if you are going after things you need to use an elephant gun on should bring a larger team or try to get your mystical ammo to run in more consealable type of weapon.perhaps a submacheine gun(lots of smaller less effective progectiles vs one super one)?or a large calibre revolver .454 casull or .50ae

As to the .50BMG, part of the problem is the fact that they are now illegal in california and it's easier for me to explain my H&H than, say, a Barrett heavy rifle. Another problem is that the shape of the .50BMG cartridge, which is bottlenecked and that makes it almost impossible to properly place the required components. that is partly why I chose the .600 NE, for its shape. I currently side lining the H&H project and I'm working on shotguns right now, but I'm running into problems with both pump and semi-auto shotguns and right now I can only get single and double barrel (single shot) shotguns to work...the others have had this nasty tendency to cause the magic cartridges to fire while chambering them...I'm currently healing 3rd degree burns on my right arm and part of my torso from one of them detonating in the gun, at which point the gun blew up in a fairly unpleasant fireball.

Another reason that I like the H&H is that I'm comfortable with it, having been using for sometime as a big game hunter, I've also been taking it with me on some recent trips to certain odd locations where it has given me an edge that a shotgun wouldn't...namely a little extra range and power that has saved my life

me too...after my less than stellar succes with the semi's I was pretty sure than pumps would work. I may have a problem with the spell cartridges themselves and that would be rather...annoying, to say the least. I'll let you know what I come up with...

Or perhaps the lack of it is what makes it so sensitive?

I get the idea that it's more mystic then conventional. But it definitely sounds a lot more twitchy then anything I'd like to carry.

the spelled shells are activated basicly by a spelled firing pin that releases the magical charge in the cartridge on contact. I designed the gun so that it could still fire conventional ammunition as well as my experimental stuff...I'm going to look into the firing pin as well as the enchantments that I placed on the barrels and reciever of the weapon itself. I'm half way afraid that the number of enchantments that I've had to place in the pump and semi shotguns may be reacting with each other and setting the cartridges off.

It would be more useffull, but the enchantments to the gun itself are required so that it can handle the energies that pass through it. Without the enchantments the weapon would likely destroy itself on firing. I've been going over the weapons that I'm using and have already enchanted, and I think that I've figured out the problem, it appears that the enchantments that I put on the pump guns were flawed somehow and were behaving erraticly as a result. I find this to be rather odd because I know that I didn't make any mistakes during the ritual...I may be having sabotage problems on top of everything else. When I fix the firing enchantments the pump system should start working fine...cross your fingers.

Cross my fingers, hope you still have your's next time I see you.
And boss? Don't die. Losing my job would make that part of my life a bit harder then I care for.

Well, the good news is that I got the pump system working perfectly, the bad news is that the enchantments were sabotaged and I still don't know who did it...I used to think that my residence was pretty well protected against such intrusions but apparently I was wrong. As soon as I have any new info I'll post it else where.

Just curious, but are there any businesses tied to Phillip Donaldson in your area?

There might be, but the name isn't ringing any bells right now...but then, I have been rather distracted. Why?

He's a rather wealthy man who has an interest in these sorts of things. I had the displeasure of being present at a meeting between himself and the REC Board of Directors once (I was responsible for making sure the computer we were unveiling publically the next day was up and running). He struck me as being very arrogant and not a little creepy besides. On top of that, one of his companies tried to buy us out about five years ago. Thankfully, the SEC put a stop to that.

I'm thinking you might be the victim of a kind of occult industrial espionage.

I know for certain that it is occult espionage. To get inside of my residence uninvited, you have to deal quite a few protections that I have placed around the place, these are designed to keep out everyone from your common burglar to supernatural invaders with effects that range from non-lethal (for dealing with non-supernaturals) to highly lethal...This Phillip Donaldson would have to be a Sorcerer of the first degree to get inside.
So I don't believe that he's responsible, though I will keep that option open and look into his possible activities. My suspicions are tending to lean towards something more dangerous, like demons or a large cult or, even worse, both.