I have shot square patches for 30+ years. I have tried round ones, cutting at the muzzle, etc., makes no dif in my shooting. For a true marksman in competition it may make a dif., but for me I see no dif. If I can shoot a 1 - 1 1/2" group off the bench at my age & eyesight I am as pleased as punch ! ha ha !
I cut my patches with a rotary cutter & can cut about 3500 patches for the .54 cal in about 15 minutes. Actually takes as long to set up than to cut patches. About 10,000 patches for the 40 cal. in the same amount of time. In an hour you can cut more patches than you will shoot in 2-3 years, using a rotary cutter, cutting mat & guide.
:-)