I'm not the least bit warmed by the appearance of the A Square rifles, but Art Alphin's A Square loading manual has a hugh amount of information for anyone interested in big game rifles, cartridges , and terminal ballistics. If you want a rifle that will kick you silly, check out Profit River's consignment page. Near the bottom of the page there's a MK-V Weatherby chambered for .500 WBY, which is essentially the same as a .500 A Square, or a .510 Wells IIRC. If I had bucket fulls of cash, I'd own it.