4seventy:
NitroX's first double is a 24-inch barrelled Jeffery, so I don't think he need look any further for 'magic' handling qualities! Its all downhill from there!
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When I passed the comment that the .577 x 2 3/4 is a cartridge whose day may finally have come, I had in mind two important factors which render all the old rhetoric obsolete. They are:

1. Newly made doubles (like the Searcy), with modern steel, made to the customer's weight and power requirements. We are no longer bound to 1650 fps like the old 'nitro-for-black' loadings, or a specific factory load, anything up to 1950 fps (or more?!) can be regulated by the manufacturer on demand.

2. The two new Woodleigh bullets (Catalogue Nos. 3A and 4A). Never before (to my knowledge) has a 650-grain bonded-core bullet been offered with the thick jacket , and if Kynoch ever made a steel-jacketed solid in 650-grain with a reinforced nose, they are too rare to shoot today. With these new bullets, the old penetration prejudices simply no longer hold.

These new rifles and bullets extend the usefulness of the .577 Light Nitro way beyond that ever envisaged by the British gun trade a century ago. Over 5,000 ftlbs of ME, with bonded-core softs or steel-jacketed solids, has definitely moved this cartridge up from the realm of a 'good tiger/lion gun' to a versatile modern big-bore and perhaps the perfect buffalo gun. For the 99.99% of us who will never pull the trigger on an elephant or rhino, I reckon this chambering is worth very serious consideration!

Woodleigh 650-grain .577 Weldcores recovered from buffalo:
Left: CatNo.5 (for BP), Right: CatNo.3A (for Nitro)