You cannot force a 5.56X45 NATO cartridge into a 5.45X39 chamber, there is almost 1/4" of difference from the case head to the shoulder and the forces required would be fantastic. The 1/4" he is seeing when the bolt does not go into battery is the distance the bolt head has to travel into the bolt carrier in order to cam the lugs into the barrel extension.
It does sound like the chamber is too tight. Find a gunsmith that has the appropriate reamer and headspace gauges and have the chamber touched up.
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