If we are talking just the gun and not the shooter,I would say the bore is being "seasoned".
You have only fired a few shots after god knows how long that gun has been idle.All the rough spots,rust,dried oil etc are being shot out the end/filled up etc.
You may have fired your first two from an oiled bore as well.I wouldnt expect any kind of stability for a good 50 shots and even more after you have cleaned it and fired it a few times.
Thats what I recon anyhow.
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