Author Topic: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*  (Read 784 times)

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Offline whitecap

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #15 on: October 04, 2017, 04:54:06 PM »
In looking at the web sight, the diameter is listed at .355. Doesn't this aspect bother anyone? I have slugged my barrels and really prefer .356. I was hoping to see .356 or choices.

Offline 1SOW

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #16 on: October 04, 2017, 05:11:10 PM »
Listed at .355" diameter is an indicator.  How they shoot is a better indicator.
PD JHP are listed as .355 and several here find they measure.3555".   Most like their accuracy for the cost.

There are .356 bullets out there,  but you pay more with no guarantee for accuracy in your pistol.  :-*

Offline Roger Vick

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #17 on: October 04, 2017, 09:34:13 PM »
In looking at the web sight, the diameter is listed at .355. Doesn't this aspect bother anyone? I have slugged my barrels and really prefer .356. I was hoping to see .356 or choices.

My SP O1 shugs @ .356, That did bother me when I ordered them. Not having chronyed them just judging recoil my load felt as hot as any factory JHP I have tested. The good news for me they shot better than any factory JHP I've tested. I would not worry, 250 rounds won't break the bank and they might just put a grin on your face. ;) I did check a few and they all checked out right at .355
« Last Edit: October 04, 2017, 09:35:47 PM by Roger Vick »

Offline Roger Vick

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #18 on: October 04, 2017, 09:38:00 PM »
Listed at .355" diameter is an indicator.  How they shoot is a better indicator.
PD JHP are listed as .355 and several here find they measure.3555".   Most like their accuracy for the cost.

There are .356 bullets out there,  but you pay more with no guarantee for accuracy in your pistol.  :-*

My findings exactly, they shoot great.

Offline IDescribe

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #19 on: October 05, 2017, 08:41:17 AM »
In looking at the web sight, the diameter is listed at .355. Doesn't this aspect bother anyone? I I was hoping to see .356 or choices.

Does it bother me?  No.   The standard diameter for 9mm jacketed rounds is .355.  That's the way it is.  Standard for lead is .356.  That's the way it is. 

It's much more important to get the size right with lead than with jacketed.  When the rifling lands start engraving the bearing surface and start turning the bullet, there's a lot of lateral force being applied against the walls of the shallow grooves being carved into the bearing surface.  Because lead is so soft, the lands need to bite deeply into the bearing surface to avoid deforming and smearing away that wall enough that the bullet can "jump" lands.  The result of jumping lands is horrid accuracy, possibly tumbling.

A copper jacket, on the other hand, is not nearly as soft as lead, and the lands don't need to bite as deeply for the bullet and rifling to function properly.

So we have jacketed bullets standard at .355 and lead standard at .356. 

That said, while those standard diameters usually ensure proper function, there still may be an accuracy advantage in shooting .001 or .002 over standard.  This is easy with lead because many manufacturers of cast bullets offer sizing as an option when you order. 

With jacketed, choice of over-sized bullets is extremely limited.  In 9mm, the 115gr Hornady HAP is advertised at .355, but it's .356.  Hornady advertises 125gr HAP at .356, which it is.  Other examples include Precision Delta and Zero bullets, both of which sell .356 jacketed bullets, but with both companies, they're marketed as 38 Super bullets.

For Precision Delta, you have exactly one option the 124gr FMJ-RN.  They're the same price whether you buy them for 9mm or 38 Super.

With Zero, their 9mm and 38 Super. they have 115gr as their light JHP for 9mm and 121gr for 38 Super.   The 121gr JHP sized .356 is actually a hair cheaper than the .355 9mm, but close enough to call it the same price, and they also have a 125gr JHP in both 9mm and 38 Super, and they're identically priced.

So no need to pay a premium for .356 jacketed unless you want to buy HAPs.


How they shoot is a better indicator.

^^^^^ THIS  ^^^^^

It's the ONLY indicator that matters.  ;)  If you've slugged your barrel, throw the record away.  It doesn't matter.  Let the gun tell you which it prefers.  I was talking to your gun the other day, and your gun told me that your calipers are unreliable and possibly alcoholics.  ;)


For the record, MY CZ-75 Shadowline shoots  the Precision Delta 38 Super .356 FMJ-RN into smaller groups than it shoots  the Precision Delta 124gr JHP.  It's the same with standard sized lead vs over-sized lead.  Over-sized lead produces smaller groups.  My HK VP9 is the opposite and shoots best with standard sized bullets.  I did not determine this with either of the guns by hammer a piece of metal into the bore.  I did it by loading and shooting.

That's my two and a half cents.
« Last Edit: October 05, 2017, 08:43:27 AM by IDescribe »

Offline Boris_LA

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #20 on: October 05, 2017, 02:11:42 PM »
I have tried both PD 124gr FMJ-RN in .355" and .356" OD and my two tested guns (SA and SP-01) both shot .355 FMJ-RN better. Now I have 1500+ FMJ-RN in OD .356" to trade.

Offline ReloaderFred

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #21 on: October 05, 2017, 05:57:19 PM »
If I had 1,500 .356" diameter bullets that my 9x19 didn't like, I'd just buy a .38 Super pistol and shoot them.  (if I didn't already have one, which I do)

Fred
After a shooting spree, they always want to take the guns away from the people who didn't do it. - William S. Burroughs

Offline Boris_LA

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #22 on: October 05, 2017, 06:05:15 PM »
If I had 1,500 .356" diameter bullets that my 9x19 didn't like, I'd just buy a .38 Super pistol and shoot them.  (if I didn't already have one, which I do)

Fred
I may wait until I wore the barrels enough to give them another try. :)

Offline 1SOW

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #23 on: October 05, 2017, 10:48:54 PM »
Boris,  that could be a looong wait. ;)

Offline IDescribe

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #24 on: October 05, 2017, 10:52:37 PM »
Boris,  that could be a looong wait. ;)

Right?  It's not 7mm magnum.  I have no idea how many rounds it takes to shoot out a 9mm pistol barrel. 

Offline 1SOW

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #25 on: October 06, 2017, 12:09:14 AM »
I have passing info that 60-70K on the 9mm 75 bbl shows no change using Production class/sub-sonic jacketed bullet loads.

Offline Boris_LA

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Re: 9mm 124 Gr. RMR Jacketed Hollow Point Bullets *NEW*
« Reply #26 on: October 06, 2017, 12:16:52 AM »
I have passing info that 60-70K on the 9mm 75 bbl shows no change using Production class/sub-sonic jacketed bullet loads.
That is the long wait. May seek the trade/sale then or just load batch of practice rounds on the rainy day with expectation of mediocre accuracy. I still have some boxes or .355" FMJ bullets and a lot of 124gr JHP before that rainy day happens.