I am posting a video, which will also be sent with the order notification.

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It looks like the key is to press down the front with your index finger at the same time you press down the rear with the next round, ensuring the round being pressed gets pushed down evenly so the rim doesn't bind entering the head spacing clip at the rear of the magazine.

Thanks for that.  How is the spring tension compared to the XR9?

The spring tension is a little softer than on the XR9.  There really is no binding in the clip, per se, but you have to keep the case flange behind the clip.

My mistake, I thought some testers were having issues with getting the rim behind the clip without binding (due to case tilt?).  So the front finger push down is a forward travel stop.

It's nice that the spring is even softer than the 9.

Yes, the index finger is a forward travel stop.  It is mostly not need for ball ammo, which is what is loaded most often, but with hollow points you have to pay attention, which is loaded much less often.

Hollow point = Shorter bullet, more likely to get too far forward.

Does the XR9-S mags need to be loaded similarly? As I watched the video, I thought that looked just like what I do until y'all pointed out the forward stop action  occurring.

When I load my XR9-S mags, I always put the rounds as far forward as I can and didn't realize much slop left over. Should I retry my Underwood 147gr GDHP +P and make a conscious effort to keep them as close to the back as possible?

Alan,

To answer your questions, No, and No in the XR9.

XR9 mags have a forward stop head spacing shoulder built into the entire length of the mag.  That is the head spacing method.  In the XR45, iirc, the forward stop shoulder is only when the top bullet is against the feed lips.  Once it is pressed down to load the next round, it is no longer stopped from moving forward by the front of the feed lips, and until the next bullet is inserted, it isn't low enough to be held by the rear clip that holds the case rim.  Once it is behind the clip, it cannot move forward anymore.  It is that in between top and second position that the cartridge can move forward, and end up in front of that clip while being pushed down.  If that happens, you have a guaranteed no feed situation.

It may sound complicated but it really isn't.  Basically it is a rear bullet positioning system that hands off to a front one between the second and top position.  Rounds traveling up the magazine do it without a problem.  You just need to take care loading as that is where misalignment can happen.

Alan Marsh said:

Does the XR9-S mags need to be loaded similarly? As I watched the video, I thought that looked just like what I do until y'all pointed out the forward stop action  occurring.

When I load my XR9-S mags, I always put the rounds as far forward as I can and didn't realize much slop left over. Should I retry my Underwood 147gr GDHP +P and make a conscious effort to keep them as close to the back as possible?

Once again, you nailed it on the head, Bret.  

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