Marlin 336 in 35 remington when I was ten. 200gr Silvertips and a Bushnell 3-9 in seethroughs. Scope promptly fogged solid the first morning of season so I removed it and used the irons.

260 Rem Model 7 with 140 GrandSlam Nitrex factory loads, M8 4x up top was next when I was about 13. Burned all 12 rounds I was carrying without cutting a hair as a big cow stood and looked at me. I think I might have been excited.

Got a sporterized 03 in 30/06 when I was 15 and managed to knock my first bull down with a single 180 X bullet I'd handloaded. I was 19 at the time.