Your CCI 200s are fully fine on your Garand. Just make sure that You mostly seat your primers under flush. I use CCI 34s, but I would not wait for a second to work with CCI 200s. I have employed BR-two's in 7mm rem mags with very good final results, https://ccizndhtchen79288.idblogz.com/32079484/the-2-minute-rule-for-federal-205