Thats probably an spanish made gun, Invest Arms I think, something like that, just like a Lyman. If so it will have pretty deep lands/grooves soooo... 90 grs of 2 or 3f or equivalent, you'll have to experiment. 490 ball with more than likely a .018 patch. I bet a ballistol water mix of 1 part ballistol to 7 parts water will work well but you can experiment with that to see what works best.