The Marlin model 60 is usually very accurate rifle. Have had many Marlin semiauto variants and two 60s could average well under 0.5" for consec groups at 50.
They are particular as to how to use them. First run action very clean and near dry with almost zero oil on parts - just a drop on bolt. Then give that barrel a good clean, then shoot in to relube it with 10-20 shots as required. Then try CCI products - Marlin microgrooves usually like them. My present model 795SS semiauto will average in the 0.4s for consec group sets at 50m with CCI Minimag HV. Old Aussie powerpoint worked well in one of mine, but recent US sourced winchester is nowhere near as good. Here is a basic set of Marlin semiauto guidelines I put together 10-12 years ago for the US RimfireCentral site.
https://www.rimfirecentral.com/threa...iautos.507000/
And this is what one of my model 60s could shoot - set of 5 shot groups at 50m with plain Tasco 3-9 on it. There was another 0.3" group too but couldn't find it. This is with Aussie HV Powerpoint:
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