Has anybody put some real time behind copper monos and noticing a barrel wont group well or keeps having POA/POI shifts if you fired traditional lead jacketed bullets first? I saw a thing on youtube *backfiretv* and ron spomer TV, both talking about this, and have noticed the same trend.
Ive shot around 3-400 rounds of hornady CX bullets & Barnes TTSX for hunting season, and was having some wacky POA/POI shifts. Groups would be around 1.5 MOA then random outings the rifle would hammer, sub 1/2 MOA, shot a 4” group at 1040yards with the 190CX in 300PRC. I could not for the life of me figure out why things were so inconsistent. I was having issues with vertical POA/POI shifts as well as horizontal and thought it was my technique, rifle, loose screws, etc, would go back to 225ELDM reloads trying to save some coppers (i train with 225ELDMs for cheaper cost) and the issue would go away, then back to factory 190CX ammo or reloads with copper and i’d shoot a 5 round group re-zero and my next group would be like .3 mills or more off. Go home, clean, back to zeroing and I’d be chasing a wandering zero for days. I thought something on my rifle broke, changed the optic, even re-barreled it with another proof barrel.
It seemed the barrel just would never settle down. My reloads would shoot fine with ELDMs, and some days the coppers did okay but others it shot like crap. That’s when I saw an episode on Youtube of backfire tv shooting coppers fine, shot lead fine, then back to coppers and shot like 5 groups or something and it all shot like crap.
A lightbulb went off in my head, I cleaned my barrels down to bare steel, and shot again. Huge vertical (3MOA) while the rifle fouled in 6-9 rounds. then it kept POA / POI over 3 different days, cold bore at 600 grouped .7 MOA and POA/POI was perfect.
Has anybody else noticed this?
Ive shot around 3-400 rounds of hornady CX bullets & Barnes TTSX for hunting season, and was having some wacky POA/POI shifts. Groups would be around 1.5 MOA then random outings the rifle would hammer, sub 1/2 MOA, shot a 4” group at 1040yards with the 190CX in 300PRC. I could not for the life of me figure out why things were so inconsistent. I was having issues with vertical POA/POI shifts as well as horizontal and thought it was my technique, rifle, loose screws, etc, would go back to 225ELDM reloads trying to save some coppers (i train with 225ELDMs for cheaper cost) and the issue would go away, then back to factory 190CX ammo or reloads with copper and i’d shoot a 5 round group re-zero and my next group would be like .3 mills or more off. Go home, clean, back to zeroing and I’d be chasing a wandering zero for days. I thought something on my rifle broke, changed the optic, even re-barreled it with another proof barrel.
It seemed the barrel just would never settle down. My reloads would shoot fine with ELDMs, and some days the coppers did okay but others it shot like crap. That’s when I saw an episode on Youtube of backfire tv shooting coppers fine, shot lead fine, then back to coppers and shot like 5 groups or something and it all shot like crap.
A lightbulb went off in my head, I cleaned my barrels down to bare steel, and shot again. Huge vertical (3MOA) while the rifle fouled in 6-9 rounds. then it kept POA / POI over 3 different days, cold bore at 600 grouped .7 MOA and POA/POI was perfect.
Has anybody else noticed this?
