I just purchased a Marlin .44 mag. with a micro groove barrel. Any information on loading lead bullets would be appreciated. I am an old timer and have been reloading since 1958. Thank you, Ed life member VFW & NRA.
In my opinion the issue with micro-groove was that the barrels were often not reamed completely smooth.
It's definitely one of the issues, whether or not better reaming would fix the entire issue.
Here are some bore pics of .22s: Rough bore picture New picture added. — GunBroker.com Member Forums
If I am correct, then the quality of the bores probably tends to vary, so there would seem to be a chance you might do OK even if the critics are right.
harder bullets, gas checks, & slower powders (4227, 5744, 4198, ect)