Jack Lott had a hand with all of this, he used the G&A type rounds (using .404Jeffery basic brass) to clean up existing chambers, giving a good 200-300fps advantage over conventional rounds of similar calibre. Similar to the Howell rounds I believe!
The 460 G&A (Tom Santos's idea) was a different kettle of fish as it use a full length blown out & necked up.404 cas to get a case full of powder & pushing a 500gn pill at the magic 2350fps like the 416 Rigby round, but in a much more efficient size & not getting pressures too high in the process.
Jack's loads were 90gn IMR4064 with Federal 215 primers using Hornady 500gn softs in BELL brass for right on 2350fps in a 24" barrel, for solids he reduced the load by 2gns.
The smaller 450G&A was to clean up the .458WM chamber & beat it by 200fps using 78gn IMR 4895 for 2160fps or 80gn IMR 4320 with 22" barrels. Refer Page 77 in Jack Lott's Big game G&A action series magazine in 1983.
Jack's own idea (.458 Lott was a lengthened .458 WM chamber which is capable of firing both rounds in a pinch) really needs a long action, but in the case of the .450G&A it only needs a standard length action.
In reality all these rounds are going to be hard hitters & really its down to personal choice.
The non belted cases like these should have been picked up, but it is a limited market & arms makers prefer sales!
Would be a great pick up at the price quoted, but a definite handloader proposition & if taking to Africa would require appropriately marked brass!
Shame it is a really good round!
93x64mm