I have a Model 70 300 win mag. I have never had it do this. I some rounds seem to go in a little harder than others but never jammed. I fired 3 3 shot groups and gave the barrel about 10 minutes between in the shade to cool. I then fired one round ejected it put another round in tried to close the action and it would not close completely nor will open. Does anyone have any experience with this? Please help