I ran 20 rounds through the Ruger 10/22 with one dud round that failed to fire. I got middling group sizes averaging about 3" at 50yrds. But when I ran it through the Marlin 60, the shots were all over the place. Average group sizes were over 5 1/2" and numerous failures to cycle.
I thought something might be wrong with my rifle so shot a few rounds of Aguila Super Extra HV and those shot normally in a 1.7" group. Then I reloaded it with more Fed Range and again got loose, inconsistent groups again. I even had another shooter try shooting the ammo in my Marlin with same session with the same poor results.
In 3 testing sessions, I noted that the rounds sounded more muffled when fired in the Marlin than the Ruger. I experienced 3 failures to cycle; where the spent case was ejected but the bolt did not feed the next round. And one squib that I had to push out with a cleaning rod.
That isn't to say this ammo is completely garbage. It shoots fine in my bolt gun and my AR style 22LR. But my Marlin really does not like this ammo. We've all been told that ammo do shoot very differently in different rifles; this is one of most extreme examples I've experienced.
Has anybody else experienced anything like this in their Marlin 60?

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