Higher pressures - e.g the sort of pressures developed in a big game hunting cartridge, which is beyond what is generated in a military cartridge of that era. My figures for the 98 are from our friend wikipedia - I’ll check SAOTW & Jane’s when I get home.
A match rifle is a rifle optimised for shooting at targets in competition. Springfield only had to pay royalties until WW1, since there are large chunks of the design ripped off the Mauser 98. IMHO, the Springfield is the best of the cocks-on-opening Mauser-type rifles.
The criticisms levelled at the SMLE by people schooled in the “Bisley school of thought” proved to be the exact reasons why it was a great battle rifle! If you want to see what satisfies the Bisley school of thought, you need look no further than the Ross and the Pattern 14, which were heavy, unwieldy, more dirt-sensitive, had smaller magazines, & were slower to operate, although more accurate than the SMLE. But, you only need a rifle which is inherently accurate enough to hit a person out to realistic combat ranges, and the SMLE can do this admirably, and can be fired faster than any other bolt-action rifle (the record is 38 rounds in 1 minute, all being hits at 200 yds by a Pte Snoxall). My personal record is 25 rds in about 50-55 secs (I ran out of ammo!), starting with only 5 in the rifle (rather than 10, due to competition rules).