My #1A in 7x57 had only a 22" bl. It made lovely little groups with 140gr Nosler Partitions driven by a decent load of IMR4320 - 2,940fps. The fellow I sold it to used it as his main hunting rifle for a number of years, shooting 1 or more deer and 2 black bears with it, each year. He used the same load.
A modern 7x57 Mauser rifle will duplicate or exceed the same barrel length 7mm08. The '08 case has a better shape, the 7x57 a couple gr. more capacity. They are pretty much dead even with the lighter bullets. Sometimes magazine restrictions hurt the performance of the 7mm08 with heavier bullets.

CIP specs for the 7x57 Mauser is 57,000PSI - same as the 8x57 and 9.3x62.