I agree that you are more likely to get really small, < 1/2", groups with customs. And with glass, 99% of the time you get what you pay for, although the law of diminishing marginal returns applies. A lot of rifle manufacturers are guaranteeing moa with premium factory loads and with all this long range shooting popularity there are some really nice factory rounds available. I just point that out because it is easier nowadays than ever before to get lucky with cheap factory guns, optics and ammo. I will never talk anybody out of spending coin on guns and optics tho.