AZXDM

In auto's the bullet profile dictates the seating depth. I too load Precision 125's, they have to be seated shorter than what I like but they function fine. I was loading another brand out to 1.125 which gave 100 percent reliability. I think the Precisions are at 1.10 in my gun presently. These are both TC profile bullets. The difference in my two bullets is the shape of the cone. The precision bullet has a "fatter" nose, whereas the other brand the nose would fit into the barrel without contacting the rifling. It just so happened that the amount of bullet in the case is the same, the Precision bullet is shorter. This is a very important point when reloading. If you seat a bullet deeper than before, using the same charge you will increase pressure. This can be dangerous at the worst but will also affect accuracy. You might try some other bullets before reaming the chamber, see if you can find one you like that works the way you want it too. You could also look into a different barrel with more generous dimensions, then you would still have the stock barrel. Just a thought, hope you find a good solution, let us know. Best, Rick

I'll make just another point, you didn't specify if you were using your brass or range brass. If you pick up brass as I do, you'll be getting some that is bulged at the base more than normal. This will not allow the case to completely enter the chamber and it will vary depending on what gun it was fired from. Glocks do this as their design is different, 9mm that is loaded hot to make major power factor may also do this. Glocks are good guns and they are popular so you'll pick up some. Just be aware that a bulged case won't chamber the same and will stick. Most reloading dies do not resize the case far enough down to take the bulge out. You might make sure that your test cases are close to the same. Use your calipers just forward of the webbing to check. You're getting good advice from the guys, hang in there you'll get it. Rick

I always use my barrel as the check for proper fit. Each gun is going to "like" it's own OAL. Sounds like you've found yours for the MGHP. If you switch bullets you may find the gun will want a different OAL even though you're shooting the same weight, same brand but different bullet type, ie FMJ or TC or a HP of a different brand. Hope this is making sense. Auto pistols headspace on the mouth of the case, the bullet forward of that in the chamber where if loaded too long could engage the rifling, you might have a tight chamber not allowing the cartridge to completely enter. Every gun is different. Stay close to published data, check three or four sources, load some at less than maximum, check for function and signs of high pressure and work up from there. All of my match ammo gets the barrel test. It needs to be 100% reliable. I'm slow enough as is without having to deal with ammo problems. Hope this helps, Good luck. Rick

Good advice above. I agree that Glocked brass can be a problem. If you're using range brass or buying once fired bass you are getting a fair amount of it. They are good, popular guns. I take my XDM apart and chamber check every round, I find 2 or 3 rejects out of 100 or so. I use an undersize die from Evolution Gun Works, it makes most of the bulged brass work. I use range brass exclusively. They're about $30.00. They do really "work" the brass though and probably shorten the lifespan of the brass, but it's free so. Another note on OAL. 1.140 may be a little long, every bullet brand, type is going to have it's own OAL. You just need to find it. I shoot 4.1 to 4.3grns of 231 or HP38 and it works great in my gun, you're right on powder wise. Most guys here shoot in competition and ammo has to be 100%. So you'll get some great advice. Good luck, and keep us posted. Rick