I'm fairly new to 4570. Been loading 350 Hornadys in my Guide Gun. It shoots them very well. I tried some 400 Barnes last time and they didn't work out 3-4 inches. While at the range I talked to a couple of guys, one said his accuracy load was 1/2 grain more 3031 than mine but with the 405 Rem. I tried it today, two 1" groups. Maybe not the best for D/G but I bet it works on close range Deer. Oh ya the load is 51.5 grs. 3031 405 Rem. My 400 Barnes load was going 1775 fps. with 1/2 gr. less. Just thought I'd pass it on.