I use a 686+ for SC makes me concentrate on my shoots. The last match I used 150 rounds for a 145 round match. It's fun beating shooters half my age when they use hicap auto loaders.
Dump the Winchester garbage stick with Mini Mags. Polish the spring guide and charging handle. Look for sharp edges on the bolt. Better yet replace the bolt and charging handle and spring guide with a Kidd. Scotch bright the inside of the receiver and check for screws from the sight base protruding into the receiver.
Our out law matches run on monday evening 2X a month 20-30 shooters. Four stages four strings six rounds. Some stages have six plates some four plates but six rounds per string all stages. One will be a speed stage . One might have a mandatory reload. At least one will have six plates shot in a certain order that changes each string. A sitting start gun on the barrel back to firing line is not uncommon. Another will be strong hand one string weak hand one string free style two strings. They take about 2-2.5 hrs. We run all SC classes and a micro carry class a little something for every one. The only people we loose are the ones that can't hit anything and aren't interested in improving they shoot two matches and give up.
I spent most of my working career in the tool and die trade and can say from experience some people are way better than others when it comes to knowing how things should fit together.
Nothing wrong with cutting the rear sight with a hacksaw to remove it. Some times when they press in the sight it is to tight and galls and are almost impossible to remove without cutting them. As far as using a Dremel unless you have a lot of experience using one and are real steady the hack saw is safer. I was in the tool and die field most of my working career and can tell you a Dremel is a great time saver if the operator knows what he is doing. I have also witnessed the results of someone that thought they knew what they were doing.
Sorry I didn't see your first post most of the time I only look at the rimfire posts.
I had that problem. The first thing I did was the TK mag tune and break the sharp edge on the chamber. Out of six mage five are blue. The next thing was remove the mag eject plunger and spring. Last I replaced the extractor. Every step the feeding became more reliable. Over at rimfirecentral they have quite a few threads on this problem. The last recommendation was replace the mag release with an aftermarket one.
What annoys me the most about this my S&W Victory fed everything right out of the box no tuning or troubleshooting and cost me $250.00 less.