Excellent explanation given on that page GarretJ, thanks for finding it. I neglected to mention that it's very important not to carry the radius up into the cutout for the buffer pin. Shortening the bottom part of the bolt could be very bad indeed, as rupturing even a .22lr case can eject a lot of burning powder sideways from the action. Had that happen on a homemade .22lr bolt rifle when an improperly designed extractor blew out after 100 or so shots, leaving a small area of the brass unsupported. Very loud, when one isn't wearing hearing protection because the gun is normally very effectively suppressed.
Polishing the hammer face a bit can also help. I like to wipe a tin film of good low viscocity grease onto the hammer face each time I take the thing apart for cleaning just to ease the bolt sliding over it a little further. And of course my buffer pin is replaced with a 1/8" drill rod covered in 1/4" OD fuel line, which makes a very effective buffer indeed.