I think that it is because I fed round direct into chamber as rifle is controlled feed.
Yes, that can be bad depending on the rifle. M70's are supposed to be okay with it and I have done it my mine. Regardless I don't normally do.
If you feed out of the magazine and you're still having problems, then I'd say your COL is too long for your rifle. Each rifle is a system to it's own and so what works in one rifle won't necessarily in yours.
An old and simple trick.
1. Take a spent piece of brass where the bullet your loading will fall right into the brass if you let it. Press the end of the neck a bit against a table to create a flat spot.
2. Seat a bullet now into this piece of brass a bit longer, maybe 0.1", than what you're currently seating. This may be too long, but I'll address that.
3. With a lit match, soot up the bullet or alternatively use a black marker. Measure the COL and note it.
4. Put the round in the magazine if you can. If you can't then at least push the back end of the brass down into the magazine and push the bolt forward allowing the round to come up between the extractor and bolt face as normal and close the bolt fully. If the bullet as expected is seated a bit too long, it will get pushed up against the rifling and subsequently the brass will be pushed up the bullet.
5. Now extract the round slowly. As you do so the rifling may "grab" the bullet enough to pull the bullet a bit out of the brass. This is the purpose of the soot on the bullet.
6. Carefully inspect the bullet for a clean spot where the flat spot scraped off the soot as it was pushed up the bullet when the bullet was stopped against the rifling.
7. If you see a clean spot, then slowly seat the bullet up to the front edge of this clean spot and measure the COL. This is your maximum COL for your rifle with this bullet. Normally most folks will back off of this measurement by 0.02" minimum. Frequently even after backing off by this amount, you'll be limited by your magazine length and that will essentially become your maximum COL. However depending on the bullet and rifle, your max COL is less than what your magazine will allow.
8. If you don't see a clean spot at step 7, it would mean that the rifle didn't grab the bullet on extraction. Measure the COL before you do anything else and compare to what you measured at step 3. The COL should be less than what it was at step 3. Now you can pull the bullet a bit to find that clean spot which should show almost immediately.
It may take a couple of times thru this process for this to sink in, but it's really not that difficult to get what you're doing.
Once you're confident in what you're doing, repeat the process 3-4 times noting your measurements each time. You should come up with pretty close numbers each time. If you're getting significantly different measurements, then something has gone awry, but that's never happened to me. It's been awhile since I've done this, but it seems like my shortest/longest measurements were normally with 0.002" of each other.
