Like Dick Wright, I also had my gunsmith (a "pro") install the Kepplinger Single-Set Trigger on my #1 RSI and am very happy with it.
My gunsmith set the regular trigger let-off at slightly less than 3 lbs... and the "set" let-off at just a half ounce or so.
Accuracy definitely improved after the Kepplinger was installed and as long as I let the short, thin barrel cool down some between shots, the sweet little rifle in 7x57mm now shoots 3-shot groups into a bit less than a 1-inch at 100 yards with my hand-loads.
The Kepplinger set trigger is a "natural" with the Ruger #1 rifle.
Strength & Honor...
Ron T.
