I ordered some heavier pellets for this 1400cs, a .177cal, a so-called \” Ultra-Magnum\”. I had been shooting the lighter pellets, like JSB Exact Express, H&N sniper light, etc. But since this rifle tested at a high of 1413FPS wit 5.2gr pellets, I thought something heavier for greater range and stability was definitely in order! Some surprises ensued, as you\’ll see in the video. This is also the point where I bought a heavy-duty extension cord to plug in the IR lights to get more stable power to them. It does seem to cure some of those pesky errors? I was later to find that removing the Caldwell unit\’s 9v battery would also reset some of these errors at a later date.