The initials make me think it could be made by Ron Snover.  If this is true, you've got a top grade bbl.   FWIW,   Ken

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Also his middle initial is K.

He is Canadian.

The RKS stands for Ron K. Smith, the 90 means it was made in 1990, the 24.5 is the 1:24.5 twist at the chamber and the 15.7 is a 1:15.7 twist at the muzzle and the bore diameter is .321 inches.

These 32 barrels were best with 200 to 210 grain bullets.

Although Ron prefers the stainless he also makes chrome moly barrels as well. He also makes both 8 or 6 groove barrels.

Dave

The .32 RKS is a .357 Maximum case trimmed back to 1.470" and tapered with a .223 Remington die. (and then retrimmed to 1.470").
This requires annealing of the case or else you will loose half to a third when you size them.

The load for the .32 RKS is 11.0 to 13.6 grains of Accurate Arms #9 or H108 powders. (same loads for both powders).

My best competition score was a 1245/1250 using 13.2 grains of H108 using a 232 grain Paul Jones spitzer sized to .323 in my RKS gain twist barrel that finished at 1:11.5 twist.

My 1:14 gain twist barrel in 32 RKS was best with 12.8 grains of Accurate Arms #9 or H108 powders using a 210 grain Paul Jones spitzer.

Testing of powders has indicated a sweet spot in the barrel for every .3 grains of powder so when fine tuning do not test every half of a grain of powder like some people do. You need to test loads that are .1 grains apart.

Note: Schuetzen shooters have been going to heavier/longer bullets and tighter twists to gain slight improvements in the windier conditions.

Dave