Originally Posted by
uscra112
Yes. The Favorite and Model 44 share a serious weakness, which is that the geometry of the toggle linkage is such that the compression load on the link is almost 80% of the bolt thrust. Repeated firing batters the link holes oval, and headspace opens up. The link in the '94 Favorite is thin, and particularly susceptible. I've repaired a good many by fitting oversize pins, (4mm for Favorite, 5mm for Model 44). This requires some chucking reamers, which ain't cheap, but it does the job. Meanwhile keep your loads mild.
Can I assume you are dumping the powder from those blanks? Blank fire powder is extremely fast, and creates unusually high pressures. (A historical note is that the bursting charge in American WW2 grenades was just "blank-fire powder".)