I just started having this problem shooting today. I shot about 17 rounds 2 rounds at a time to sight in my scope for deer season. This is a 1970 model year so it's a older but a good rifle. Used it last year and dropped a deer in it's track's at 150 yards slightly up hill. Today it miss fired like 3 times also. I broke it down after shooting to clean it good and it's still hard to pull back. It feels like it's getting hung up on something even when there's no magazine in. Any ideas would be good as tomorrow I'm going to check the scoop for accurate groups to make sure I didn't throw the scoop off some. Thanks in advance.