Swiss is hotter burning powder, giving more velocity for the same volume of powder. You may have to reduce the powder charge by 10-15%. The difference in velocity does not justify the extra cost of the powder, unless you are a bench rest target shooter. Those folks don't shoot .32 caliber guns, either.
Schuetzen and Wano powders are on par with Goex as velocities go, and sometimes can be purchased a bit cheaper than Goex.
The Chamber pressures on hot loads in the .32 are much higher than anyone previously believed. Be very careful how much powder you load. The last thing you want is a Nipple flying back at you, along with powder debris. Always wear eye protection when you shoot. If you have a chronograph, or access to one, use it when developing Safe loads.
Its not difficult to send a .310 PRB out a barrel at 2,000 fps. or faster. The real question is " WHY?" Because of its light weight, its good for small game out to 25 yds, and perhaps on larger varmints to 50 yards. But any wind moves the ball around a lot, making hits at longer yardage a real problem when you have any kind of breeze. Its not going to be a .30-06 with anything you are loading in the gun, so just enjoy these pea shooters for what they are. Keep the balls subsonic, and they will be as accurate as you can hold your sights, and give you hours of pleasure, plinking at cans or whatever you have, and will be a wonderful choice for that squirrel hunt with a buddy. :thumbsup: