Xtreme Bullet Reloading Recommendations - MP-Pistol Forum

Xtreme Bullet Reloading Recommendations

This is a discussion on Xtreme Bullet Reloading Recommendations within the MP Reference forums, part of the Smith & Wesson MP Forum category; I'm shooting a MP9 (standard) for matches. I'm new to reloading and I really like Xtreme Bullet's 147gr FP HPCB. However during my last match ...


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Old August 18th, 2012, 10:11 AM   #1
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Xtreme Bullet Reloading Recommendations

I'm shooting a MP9 (standard) for matches. I'm new to reloading and I really like Xtreme Bullet's 147gr FP HPCB. However during my last match I noted that although during fire the rounds were flawless (I wish I could say the same for my shooting) when I unloaded to show clear I noticed the slide of my MP9 was "jammed"; I really had to muscle the slide to eject the live round. My OAL is 1.125-1.130. We're suspecting the flat nose may be a contributor to the "jam".

My question is for those who reload flat points, what would you recommend for the OAL? Also, what is your preference for bullet grain: 124? 135? 147? and why?
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Old September 19th, 2012, 08:52 PM   #2
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Quote:
Originally Posted by WrecksMP View Post
I'm shooting a MP9 (standard) for matches. I'm new to reloading and I really like Xtreme Bullet's 147gr FP HPCB. However during my last match I noted that although during fire the rounds were flawless (I wish I could say the same for my shooting) when I unloaded to show clear I noticed the slide of my MP9 was "jammed"; I really had to muscle the slide to eject the live round. My OAL is 1.125-1.130. We're suspecting the flat nose may be a contributor to the "jam".

My question is for those who reload flat points, what would you recommend for the OAL? Also, what is your preference for bullet grain: 124? 135? 147? and why?
I had a similar problem requiring some force to eject the live round. I would try loading 5 or 10 rounds each at increasingly shorter lengths. Maybe down to 1.10 in 10 or 15 thousands increments. See what your pistol likes. BUT make sure you make reductions in powder charge as you shorten if you are anywhere near a max load.
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Old August 23rd, 2013, 09:01 AM   #3
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Thanks, Judgecrater, and sorry for the late reply!
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Old August 23rd, 2013, 11:03 AM   #4
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Shouldn't be any issues if you're shooting minor, but yes, re-seat the rounds a bit shorter, about 1.115 works well for me, using 147gr molys. Back the powder off a few tenths, and re-chrono.

Jeff
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Old April 11th, 2015, 10:24 AM   #5
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Sounds like your seating depth is insufficient causing the bullets to jam into the rifling/throat.

Definitely follow judgecrater's advice. With the 9mm a change in as little as .01" can cause a significant spike in preasure, especially with certain propellants.
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Old April 11th, 2015, 11:19 AM   #6
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I contacted Xtreme a few months ago regarding load data. They told me to use the Speer Manual for load data.
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Old April 11th, 2015, 02:49 PM   #7
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That's all good and fine, but they aren't loading for your pistol. Data is a guide only. If your pistol's throat dimentions aren't compatible with the seating depth then the data isn't going to work and must be adjusted. As said before load data is a guide. The data gives you a range of velocities that can be safely expected with a particular case, primer, powder, bullet combo in THEIR barrel. Any change in any of the variables requires a reduction in charge followed by working up for safe load development. One of those variables is the barrel. That being said, sample loaded cartridges should be checked for fitment in the chamber of your barrel.
Also, proper load development should include a chronograph. Without it you are just guessing
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Old April 11th, 2015, 02:55 PM   #8
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OAL isn't the end all. The ogive is just as important, esp. for proper feeding and chambering.
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Old April 15th, 2015, 06:32 PM   #9
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Groo here
Take your bullet drop it in the barrel,measure from the base of the bullet
to the hood [extension on the barrel] then measure the bullet length.
Add the two measurements.
This is max overall length for YOUR barrel.
If the shell fits the mag-ok,
if not shorten.
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Old April 16th, 2015, 07:27 AM   #10
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Good tip Groo01
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Old April 16th, 2015, 12:25 PM   #11
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Your round was too long or you didn't fully size the case. If shooing range pickup the case might have had a "glock bulge".
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Old April 17th, 2015, 07:08 PM   #12
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Wrinkles brought up a good point. Kinda assumed that would have been noticed, but you know what is said about assumptions.
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Old April 24th, 2015, 05:26 AM   #13
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I shoot 124gr XTREME round nose exclusively. My current formula is that bullet over ~5.7 grains of Power Pistol, seated to 1.125" OAL. CCI primers. I do a very light crimp. I've loaded and shot 2000+ rounds using this with very good results.
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Old April 24th, 2015, 10:41 AM   #14
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I had the same issue when reloading the 147g flat point Blue Bullets. I loaded some bullets without primers or powder and used those with the plunk test to determine an OAL where the bullet wouldn't jam in the rifling. With round nose and hollow points, 1.15 was about my longest, consistent OAL with misc range pickup brass. With the 147g flat points, had to back it down to 1.08 before they would consistently pass the plunk test. I also use a case gauge but not on every round since the Lee resizing die does a pretty good job.
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Old April 25th, 2015, 06:26 AM   #15
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OAL is a convenient thing to measure, but the important thing with regard to pressure is how much of the bullet is inside the case. You should have noticed that most loading data specifies not only the bullet weight and powder charge, but the specific bullet, by manufacturer, weight, and type. You have also noticed that bullet profiles for bullets of the same weight vary, some have more or less taper before reaching the full bullet diameter, this causes the chambering problem you have observed. You can determine the maximum OAL for that bullet by making up a dummy round (no powder, no primer) and dropping it in the chamber of the barrel you have removed from your pistol. Start with an overly long round and reduce the OAL in increments of 0.003" to 0.005", when you reach the proper length the round will drop into the chamber with a "thunk", it should also drop out freely when you invert the barrel. You now have a round with the maximum OAL for that bullet. You may want to repeat this procedure a couple of times to get an accurate measure. Once you have determined the maximum OAL for that chamber you should reduce it by a few thousandths to allow for seating depth variations. If you have an example of the bullet that was used for the loading data and have a set of calipers and can do some addition & subtraction you can determine how much of the bullet base is in the case as compared to the loading data you are using. Don't reduce the OAL of the loaded cartridge to the point where more of the bullet is in the case than the cartridge load data unless you reduce the powder charge. If you don't have a reference bullet, or if you are at or near the max load reduce the charge and work up.

As always YMMV, be careful......

Last edited by marlin357; April 25th, 2015 at 10:50 AM.
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