Dang boy! That brings back the memory of firing my .500 A-Square for the first time.
I bought the rifle in 1996 from the original owner out of California. He had never made it to Africa so wanted to get rid of it. Once it was here I put it on a baby scale and with four cartridges weighed exactly 11 pounds 4 ounces. I telephoned Art Alphin at his old facility in Kentucky to ask him what this thing would do to me. He told me it recoiled like a .375 H&H due to the large area of the butt. Okay, I have a .375 H&H. Art lied. It was something I cannot even describe. Kind of like your photo; it is better than words. Dang!
Every time I hear someone say the 500s are more of a "push" and their 300 Mags recoil is more unpleasant I start to laugh. I have a friend who has a 6 lb 338 Mag and he was thinking of putting a muzzle brake on it. I let him shoot my 11 lb 500 Jeffery and he said "you're right, my rifle doesn't kick much, I don't need a brake"
Yeah, I think the comparison between a 300mag and a 500Jeffery is too much of a stretch - there's just too much recoil energy from the Jeffery.
I have fired a 300WinMag and a 375H&H mag in the same rifle (Brno 602s, both the same vintage) and the 300WM's recoil was less pleasant that the 375H&H. I could bench shoot the 375H&H all day but gave the 300WM back to my mate after a couple of bench shots. They did have the old ventilated rubber style recoil pads though. I suspect the outcome using the modern CZ550 magnums with their soft pads would be a different story though.
