My personal opinion is "Rugers are built to take it, and the Seville could pick up where they left off."
It was that good from where I stood - on the range. I worked up a load to use in a Super Blackhawk Silver Jackhandle, back around 1991. It was a great piece of work. 304gr SSK 16bhn, I forget the powder charge or even which powder. It was all the Ruger wanted. Primers were just short of flowing (I backed it down from "flowing pressure" and likewise from "sticky extraction". It was designed to hunt bear and had to be flawless. It was. Accuracy was totally acceptable. Ran 10 for 10 at pigs at 100m. The owner of the Seville stepped over, discussed the load, etc and asked if he could shoot a couple. He did. Then asked if he could shoot a couple in his Seville, at his own risk. He did. Absolutely no pressure signs. Accuracy was right there. I had more of the "flowing primer/sticky extraction" loads and, you guessed it, he shot those up without a hiccup. Sevilles are built stout.
Check out "Shooting Steel" - It is 420 pages of 'the best from 10 years of "The Silhouette" 1977-1986'; the 10th anniversary of IHMSA. Lots of stuff on the Seville and others of that time period.
Sure hope you get it!! I had a couple Abilenes, which is a very distant cousin to the Seville. I never broke one, and they were accurate, but I didn't think they had the fit of a Ruger, and I was leary of their strength - they are not up to a Seville - JMHO. C-O-L-T cocking the hammer came out ping-ping-ping-ping like a tinny sound from cheap parts. Like I said, I never broke one, but I didn't drive them very hard and didn't have them very long. I paid $185 a piece for them and sold them for $285 about 8 months later. I was going through a divorce and needed the money. They go for $500 or better right now. Not sure where a Seville runs, but for sure they aren't cheap.
Jeff