Ladder for deeper bullet seating?

Dan Wesson

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My son’s XDM 9mm has a tight chamber and my normal 9mm loads don’t cycle reliably because the coated bullet hits the lands on chambering.

I find I need to seat .030” deeper to plunk in his chamber… so do I need to do a new load ladder before shooting loads for his pistol?

Current load
125gn Acme coated RN bullet over 4.2gn Clean Shot OAL IS 1.095”

New OAL needs to be 1.06” for reliable functioning.

I have the ladder already loaded up…am I wasting my time?
 
I don’t have any names to recommend, but you only need to ship the barrel. Possibly a few dummy rounds at the length you’d want to chamber.
.030” is a lot to shorten in a 9mm without working it down. I don’t know how CS works, but I usually find .1gr per .010” for well behaved powders for equal PF.
 
I don’t have any names to recommend, but you only need to ship the barrel. Possibly a few dummy rounds at the length you’d want to chamber.
.030” is a lot to shorten in a 9mm without working it down. I don’t know how CS works, but I usually find .1gr per .010” for well behaved powders for equal PF.
I’ll find out with the ladder. Thanks.
 
I’ll find out with the ladder. Thanks.
I apologize in advance for stating the obvious but keep in mind that quite often with higher pressure cartridges like the 9mm by the time you see signs of excess pressure you’re already into the danger zone of potentially damaging the firearm.

Just go slow and use the tools you have available to their best advantage: common sense, experience, and caution.
 
I apologize in advance for stating the obvious but keep in mind that quite often with higher pressure cartridges like the 9mm by the time you see signs of excess pressure you’re already into the danger zone of potentially damaging the firearm.

Just go slow and use the tools you have available to their best advantage: common sense, experience, and caution.
Agree. As usual, recoil feel, case & primer condition, chronograph results, starting a little below the stated starting load too. Since my old load is chronographed, anything that looks crazy will be noticeable.
 
You can also contact Springfield they will probably help you out they have taken great care of me when I had issues
It’s my son’s XDM. He would probably sell it rather than go through a chamber ream, but not sure. I’ll tell him.
 
May need a bullet diameter of .356" or less. Bullets to large in diameter may have to be seated deeper into the case, to chamber. . Shorter COL.

What is the measured diameter of your 125gn Acme coated RN bullets?
 
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My son’s XDM 9mm has a tight chamber and my normal 9mm loads don’t cycle reliably because the coated bullet hits the lands on chambering.

I find I need to seat .030” deeper to plunk in his chamber… so do I need to do a new load ladder before shooting loads for his pistol?

Current load
125gn Acme coated RN bullet over 4.2gn Clean Shot OAL IS 1.095”

New OAL needs to be 1.06” for reliable functioning.

I have the ladder already loaded up…am I wasting my time?

SW data actually lists 1.06" OAL for that load, so you probably G2G

9mm Luger Jagemann 124 gr Hornady XTP 1.06 3.4 915 4.2 1,064 33,420
 
SW data actually lists 1.06" OAL for that load, so you probably G2G

9mm Luger Jagemann 124 gr Hornady XTP 1.06 3.4 915 4.2 1,064 33,420
Saw that. I’m using a 125grn coated LRN .356”

I think I’ll work it up again.
 
Better safe than sorry. I had the same issue with 45 ACP. The Kahr I bought had a super short leade and I had to push the bullets back a few thou's on the loads that I ran in my 1911's to go into battery. I don't load to the ragged edge so I just ran them. No problem.
 
My son’s XDM 9mm has a tight chamber and my normal 9mm loads don’t cycle reliably because the coated bullet hits the lands on chambering.

I find I need to seat .030” deeper to plunk in his chamber… so do I need to do a new load ladder before shooting loads for his pistol?

Current load
125gn Acme coated RN bullet over 4.2gn Clean Shot OAL IS 1.095”

New OAL needs to be 1.06” for reliable functioning.

I have the ladder already loaded up…am I wasting my time?
You might also want to try a MBC.356 125 grain Hi Tek SWC or MBC.356 125 grain LSWC the nose of that bullet does not contact the lands. And they are pretty dam accurate.


IMG_2782.jpeg
 
My son has a hellcat that wont shoot cast 356 bullets. We have several other makes - Ruger and Berreta in 9 that work fine. I load all my 9 and 45 acp to 1.1 OAL and never have issues but the hellcat wont handle 356 in any length. I cast HPs, RN, and TC all in 125 weight. I dont do coated bullets just cast in #2 alloy. Jacketed 355s run okay in the springfield though (GD and XTPs anyway). I always work up new loads but usually 5% under max shoot the best in 9mm.

I think the leade in to rifling has sharp edges and shaves lead off then when the next round goes in it gets stuck. A finish reamer would clean it up but not worth the trouble to me to fix it - he uses for CC so jacketed is okay anyway and he doesn't shoot it that much anyway. I've tried sizing to 355 also but it still shaves lead off - bullets need a jacket. Plastic or paint coated bullets would likely shave like lead does.
 
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