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It happened with the last round in my "problem" magazine at 85 rounds into a box of 100. This time the SP was higher up with the tip of the bullet at the top of the chamber instead of being jammed on the feed ramp. It also dented the brass hard enough that it's a bit tight in the chamber. After getting home I looked closely at the round that jammed and it looked like it has a cut in the crown of the bullet from the left hand edge of the feed ramp on the barrel. Basically, the cut looks like it came from the edge formed at the feed ramp and the rear outer flat of the feed ramp. BTW, at this point the feed ramp is fully polished to the original factory profile. When comparing the point of the WWB ammo to the Sellier & Belloit I have been shooting in the past, it's apparent that the WWB is wider at the flat on the point. So, in my opinion that wider point just increases the likelyhood of a round catching the edge of the feed ramp. Which I think is what happened in this case.
Some good news is the point on the Winchester Ranger HP's that I have for defense matches the Sellier & Belloit profile perfectly. So I believe that I am good for my defensive ammo and the 50 rounds that I tested functioned perfectly.
More good news is that now that i have radiused the edge on the fixed ejector I am no longer seeing any cuts in the ejector rim of spent cartidges. I also didn't see any hint of hte fixed ejector peening after 150 rounds and the ejection is funtioning perfectly. So, one potential area for my SP issues has been fixed. However, I still had that one SP when shooting WWB for the first time. So, the pistol is still a bit fussy about feeding.
So, I am contemplating widening the feed ramp just slightly so that it will feed more reliably. Mainly by removing just a bit more material at that sharp edge at the rear of the feed ramp where it's squared up. However I hesitate doing this without some input from those with more experience. If it's a bad idea, I'll pass up fooling with the feed ramp and put up with the miss feeds when shooting the cheap stuff at the range.
Now, about the Truglow TFO sights that I just had installed. Even though they were designed originally for the XD series I am happy to report that the sighting on the XDm is spot on near perfect. Off a bench rest these sights present a 6 o'clock sight picture that is nearly dead on perfect at 40 feet, a very careful 3 shot group hit just 1/4 to 1/2 inch high. Off hand in rapid fire drills I was initially shooting about 2 inches high at 40 feet but I believe that will disappear as I get used to the new sights. As I shot more rounds I noticed my grouping shifting down and in careful slow fire I was hitting the mark nearly perfectly centered. They are taller than the original sight set so it will require some practice in order to get used to them.
As for the XDm, round count is now up to 700 and if I could get the mis-feed issues solved I would consider it perfect. I can now hit 8 out of 10 into a 2 inch circle shooting offhand Weaver slow fire at 40 feet and the flyers are starting to move in. Next up is to work on shooting with strong and weak hands. I did some today and was shooting 9 inch groups lefty and 6 inch righty at 40 feet. I may have to get the dumbells out of the basement and do a bit of weight training and see if that will steady me up. I also think that I'll need to work on my trigger control when shooting with an unsupported grip, my patterns were about 1.5 times as wide as they were high, which indicates that I'm pulling my aim off during the trigger pull.
Some good news is the point on the Winchester Ranger HP's that I have for defense matches the Sellier & Belloit profile perfectly. So I believe that I am good for my defensive ammo and the 50 rounds that I tested functioned perfectly.
More good news is that now that i have radiused the edge on the fixed ejector I am no longer seeing any cuts in the ejector rim of spent cartidges. I also didn't see any hint of hte fixed ejector peening after 150 rounds and the ejection is funtioning perfectly. So, one potential area for my SP issues has been fixed. However, I still had that one SP when shooting WWB for the first time. So, the pistol is still a bit fussy about feeding.
So, I am contemplating widening the feed ramp just slightly so that it will feed more reliably. Mainly by removing just a bit more material at that sharp edge at the rear of the feed ramp where it's squared up. However I hesitate doing this without some input from those with more experience. If it's a bad idea, I'll pass up fooling with the feed ramp and put up with the miss feeds when shooting the cheap stuff at the range.
Now, about the Truglow TFO sights that I just had installed. Even though they were designed originally for the XD series I am happy to report that the sighting on the XDm is spot on near perfect. Off a bench rest these sights present a 6 o'clock sight picture that is nearly dead on perfect at 40 feet, a very careful 3 shot group hit just 1/4 to 1/2 inch high. Off hand in rapid fire drills I was initially shooting about 2 inches high at 40 feet but I believe that will disappear as I get used to the new sights. As I shot more rounds I noticed my grouping shifting down and in careful slow fire I was hitting the mark nearly perfectly centered. They are taller than the original sight set so it will require some practice in order to get used to them.
As for the XDm, round count is now up to 700 and if I could get the mis-feed issues solved I would consider it perfect. I can now hit 8 out of 10 into a 2 inch circle shooting offhand Weaver slow fire at 40 feet and the flyers are starting to move in. Next up is to work on shooting with strong and weak hands. I did some today and was shooting 9 inch groups lefty and 6 inch righty at 40 feet. I may have to get the dumbells out of the basement and do a bit of weight training and see if that will steady me up. I also think that I'll need to work on my trigger control when shooting with an unsupported grip, my patterns were about 1.5 times as wide as they were high, which indicates that I'm pulling my aim off during the trigger pull.