I have a .223 that's giving me fits. After load development, I thought I found a load that shot really well....so I loaded 50 more of them (55gr Nosler w/ Benchmark powder). But, at the range today, the groups were erratic. One group would be 3/4" or so, but the very next group was 2", or something crazy like that. One group at 200 yards was 3/4", but others were terrible.
The rifle is not bedded (yet), but the barrel is free-floated, and I just had it re-crowned. The crown is perfect. All the screws are tight. All the ammo was virtually the same - prepped cases, hand-weighed powder charges. I brought my cleaning rods to the range, and groups were fired from clean barrels as well as dirty barrels. In addition, I shot groups with everything from a freezing cold barrel to a fairly warm barrel. There didn't seem to be any rhyme nor reason the rifle's accuracy streaks. One group would shoot great, and the next one would suck....so went my day.
While I certainly don't claim to be perfect, I don't think I am the one to blame this time. I didn't have any troubles shooting sub-MOA groups with my other three rifles today....and they are all much larger than my .223 Rem.
Anyone got some ideas?