Using the Pac-Nor barrel weight calculator,
I reckon that a 20"-barreled No. 5 contour is going to be only 2 ounces heavier than a 23"-barreled No. 4.
I will be doing a No. 5 sporter on my next one:

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Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.