Like SalmonEye said;
for plinking loads (ie: 7-10gr of Unique) I use bullets w/o gaschecks and tumble lubed sized and unsized. Good to ~1,500fps.
For hunting/long-range loads; I load to 2,000-2,200fps and definitely use gas-checks and SPG or NRA 50/50 type lube (several mfg's make good 50/50).
If you size, go .002" over bore diameter.