The 5.7 gun with 16" barrel is surprisingly accurate and I'm impressed with the 5.7's ballistics. I've been consistently hitting a 6 inch gong at 200 yards with a red dot, no need to adjust elevation from 100. By far my favourite plinker at the moment.
And not having to worry about stripping the case coating for a single shot, 5.7 is very easy to reload. Just need a source of cheap 40gr bullets.
Current load is Fed 205 primer, 5gr of CFE pistol, Hornady 40gr Vmax, COL 1.58". With RCBS dies just make sure the expander/decapper is turned out enough or else you crush the necks.