NO!!!!!

Either you misunderstood him, or he's an idiot and should not be listened to. Varget is a great rifle powder, and can produce excellent results in a number of rifle cartridges (but not all of them), but it's not "universal" and can't just be used in anything. Varget is a medium-slow rifle powder and is too slow burning for pistol cartridges, so I can only assume that he's referring to pistols chambered for rifle cartridges like the T/C Encore pistol.

What you need to do is get a handloading data manual (the more the better) and use the data from it. All the major bullet manufacturers put out fairly complete load manuals for their bullet lines. There is also a number of companies (mostly powder manufacturers) that put some or all of their load data on their websites and Hodgdon, Winchester, IMR and Alliant put out free mini-manuals that contain a few loads each with select bullets for a number of more popular cartridges. You can usually find them near the more comprehensive manuals that are for sale.

You also need to be careful about useing data for the specific bullet you plan to use because different bullet designs can create dramatically different pressures with the same amount of powder. There is a lot more to handloading than picking whatever powder, bullet, brass and primer combination you happen to like and throwing it all together. You MUST use the appropriate data for the components and cartridge you plan to handload for and start with a reduced load and work up to published max loads.

I truly hope you appreciate that fact so you don't hurt yourself or others with dangerous handloads.

Mike