With supplies in such high demand and not knowing when it will let up, I decided to use some of my rarely used supplies like IMR 4350 instead of H4350 and Winchester WLRM's instead of GM210 primers. For plinking steel to about 700 I figured it would work just fine. So I settled on 39 grains of imr 4350 which gave me about 2615 fps with an SD of 10. I loaded up a dozen and shot them at 100 yards and they maintained decent groups just under .75" (just fine for me for plinking around). I shot groups at 100 yard increments out to 500 and everything was great, easily sub moa. When I got to 600, I could barely keep them on a 12" gong, switched back to my proven load and they were easily sub moa. I guess my question is... Can a load fall apart that quickly from 5 to 600 yards with a decent SD of 10 and they grouped decently @ all closer distances? I used the same 140 grain eldm bullets on both loads in an 8 twist Savage, I wouldn't think stability is an issue. Just trying to keep shooting without having to use my good stuff. Anyone ever have a load just fall apart like this?