Curious cold rifle with a suppressor question. I am just getting into .22lr Trainer shooting and I went and bought the MK2 FV-SR with a threaded barrel. I put a 3x9 Red-field scope on it for now and made sure every thing was torqued. Zeroed for 50 yds I stared shooting the rifle with standard ammo from CCI. I would get a very tight group all day so I played around never removing the suppressor. I let the rifle sit for 3 hours came back placed 3 shots and they were way off. Then placed 10 more and they were perfect. Thinking this was a fluke tried it all week end and repeated this all weekend, let the rifle sit and get cool shoot 3 to 4 after 3 or 4 shots and the rifle starts to preform. I did this with and with out suppressor.The temps ranged from 48-64f this weekend. I understand this is not a 1000 dollar rifle just curious about what is causing this.