Author Topic: Popular 9mm Bullet Lengths  (Read 36079 times)

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Offline baldrage

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Re: 9mm Bullet Lengths
« Reply #75 on: March 17, 2017, 08:21:34 AM »
Have some updates for 1SOW?s list.  I pulled 10 random bullets from a recent order and measured them.  Results as follows:

RMR 115 FMJ .570

RMR 124 HCHP .555

RMR 124 HCFN .521

Above figures are averages, rounded to nearest thousandth.  Supporting data for those interested in how much variation there was:

Rocky Mountain Reloading (RMR) 115 gr FMJ
0.565
0.5675
0.568
0.5685
0.569
0.57
0.5705
0.5715
0.573
0.574
Average:  .5697
Std. Dev: 0.002551

RMR 124 gr Hardcore Match Hollow Point (HCHP)
   0.5535
   0.554
   0.554
   0.554
   0.5545
   0.5545
   0.5545
   0.5555
   0.5555
   0.5555
Average:   0.55455
Std Dev:   0.000687386

RMR 124 gr Hardcore Flat-Nose (HCFN)
   0.5195
   0.521
   0.521
   0.521
   0.521
   0.521
   0.5215
   0.5215
   0.522
   0.5225
Average:   0.5212
Std Dev:   0.000748331

Offline Sunkist

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Re: 9mm Bullet Lengths
« Reply #76 on: March 23, 2017, 10:51:09 PM »
SNS 9mm Coated 125RN .598?/New 125 Conical Nose .602?
"In the Land of the Blind the One-Eyed Man is King."

Offline romukom

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Re: 9mm Bullet Lengths
« Reply #77 on: July 14, 2017, 06:58:35 PM »
Adding into the list:
RMR 124 gn Plated Round Nose Flat Point (RNFP) : 0.527"

RMR 124 gn New-in-house FMJ Flat Nose (FMJ-FN): 0.552"

Offline 1SOW

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Re: 9mm Bullet Lengths
« Reply #78 on: July 23, 2017, 10:21:08 PM »
When I get the formatting squared away,  I'll try to update the master list with all the new additions.

Offline 1SOW

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Re: 9mm Bullet Lengths
« Reply #79 on: July 27, 2017, 12:19:43 AM »
TEST TEST TEST   
Berry's Plated        Xtreme Plated          RMR Plated   
115 RN   .557             115 HP    .506           124 RN   .577
124 HBRN   .619             124 HP   .536           124 FP   .556
124 HBFP   .555             124 RN   .583           147 RN   .667
124 FP   .530             124 FP   .525
124 HP   .569             135 RNFP .602r
130 RN   .588             135 HP   .579           Ranier   
135 RN   .605             147 RN   .669           115 RN   .556
147 RN    .670            147RN-HPCB .668

Hornady                Montana Gold            Sierra    .
90 XTP   .449             115 JHP   .549          95 JFN       .411
115 HAP   .540             124 JHP   .579          125 FMJ   .575
124 XTP   .574             124 CMJ   .593          125 JHP   .547
125 HAP    .572

 :P ??? ::) :o O0
« Last Edit: July 27, 2017, 12:31:35 AM by 1SOW »

Offline RSNO

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Re: Popular 9mm Bullet Lengths
« Reply #80 on: February 07, 2019, 02:18:09 AM »
Gentlemen, here?s a set of ?equivalent? lengths for Rainier Plated HP.

115 gr HP, 0.515
124 gr HP, 0.547

Rationale and methodology: The Rainier HP bullets have concave bottoms. Physical length isn?t meaningful because there is a concave volume down there. For the purpose of figuring out bullet seating depth, the length of an equivalent flat bottom bullet is good enough to calculate the remaining case volume.

You can check my math.

1.   Average of 5 bullets is 115.0 gr. The length is 0.525, BUT the bottom is concave.
2.   I sanded off the concave bottom of a 115 gr Rainier HP. The bottom is now flat. The bullet weigh in at 111.7 gr and 0.503 long.
3.   That means the removed lead from the concave bottom is 3.3 gr.
4.   Question: We want to add that same volume of lead back to the bottom of the bullet in the form of a 0.355 diameter disk. What would that length be?
5.   1 gm = 15.4 gr.              So 3.3 grain = 0.214 gm
6.   Lead has a density of 11.34 gm/cm3.   So  0.214 gm =>0.0189 cm3.     
7.   1 in3 =16.39 cm3.          So 0.0189 cm3 => 0.001153 in3
8.   The area of a 0.355 disk (added to the bottom of the bullet) is 0.0989 in2. 0.001153 in3 would fit in 0.0117 in length.
9.   Add that 0.0117 to the 0.503 from the shortened 111.7 gr gives 0.5147. round off to 0.515.


Do the same thing for the 124 gr bullet. You need to shave off 12.3 grain. That extra length comes out to 0.0436. Add that to 0.503, we get 0.547.


 

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