You don't seem to be a troll based on your profile, so I'm not sure what would cause you to focus on details like the fact that it was a 7.62mm rifle and that you would know what the recoil looks like for various types of rifles.
I'm assuming you got fed this idea somewhere else, and went with it. Either way I'd urge you to really try and re-evaluate from a neutral standpoint and see if it genuinely seems probable.
Allowing your mind to go down this road unchecked seems like a path to Fischer-esque paranoia and self delusion.
You don't seem to be a troll based on your profile, so I'm not sure what would cause you to focus on details like the fact that it was a 7.62mm rifle and that you would know what the recoil looks like for various types of rifles.
I'm assuming you got fed this idea somewhere else, and went with it. Either way I'd urge you to really try and re-evaluate from a neutral standpoint and see if it genuinely seems probable.
Allowing your mind to go down this road unchecked seems like a path to Fischer-esque paranoia and self delusion.