Difference between BULLET WEIGHT 115 GR. SPR GDHP and 115 GR. LRN

[coboblack]

Ok, questions, Looking up some load data...what is the difference between BULLET WEIGHT 115 GR. SPR GDHP and 115 GR. LRN?

I have 500 Hornady Bullet 9mm 115gr FMJ 500ct
Caliber: 9 mm (.355-.356)
Grain: 115

(Ordered here)
Hornady Bullet 9mm 115gr FMJ 500ct : HORNADY BULK PISTOL BULLETS | Brownells


And I am reloading with a new Powder

Hodgdon CFE Pistol
Set your sights on pistol reloading data | Hodgdon Reloading

And here are the two options that pop up...I'm not sure what to data to use...

BULLET WEIGHT
115 GR. SPR GDHP

Manufacturer: Hodgdon
Powder: CFE Pistol
Bullet Diam: .355"
C.O.L.: 1.125"

Starting Loads
Grains: 5.3
Vel: 1,059
Pressure: 23,200 PSI

Maximum Loads
Grains: 5.9
Vel: 1,185
Pressure: 31,800 PSI


or

Bullet Weight
115 GR. LRN

Manufacturer: Hodgdon
Powder: CFE Pistol
Bullet Diam: .356"
C.O.L.: 1.100"

Starting Loads
Grains: 4.9
Vel: 1,124
Pressure: 28,800 PSI

Maximum Loads
Grains: 5.4
Vel: 1,209
Pressure: 33,800 PSI

 

[robocop10mm]

The GDHP is the Gold Dot Hollow Point. Data is for JACKETED bullets. The LRN is Lead Round Nose. Cast bullet data.

Use the GDHP data, but approach maximum loads with caution

 

[coboblack]

Thanks! So it doesn't matter that it isn't a hollow point bullet? Because it's jacketed I need to follow the GDHP?


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[Dawico]

Generally yes. The bullet profile may affect your COAL to allow magazine fit and feeding though. Same weight but different profiles may (or may not) need to be different OAL to work properly in your firearm.

Load a few and test them before going wild at the bench. This is a good practice with any new load for any gun. Pulling bullets sucks.

 

[coboblack]

That's what sucks about living in city...I wish I could load some, then walk outside and test some rounds. I have to drive to the range and then pay, then try. Sucks :/

 

[Texasjack]

Cast bullets don't "slide" as easily down the barrel and so they can build up pressure a bit differently than jacketed bullets. (Plated bullets - which have a VERY thin copper coating - should be loaded like cast bullets.) Usually you'll see slightly lower powder loads for cast bullets.

 

[shortround]

A general rule of thumb: Never use the same data for lead and jacketed bullets of the same weight.

However, it is safe to use load data for similarly constructed bullets of the same weight.

Just start low, and work your way up looking for signs of excessive pressure.

 

[coboblack]

What are signs of excessive pressure look for?


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[fritzcat]

Different seating depts. make different pressures. One bullet profile can cause the base of the bullet to be seated deeper, reducing the case capacity, thus rasing pressure. So your max load, may be different than that is showing for another bullet profile. Another reason for starting loads.

 

[fritzcat]

Look at the primers on spent cases. Keep the edge round. The larger the flatten area, the higher the pressure. A chronograph is a helpful tool to check the velocities you are working toward.
Please do not use the Max load 55.4grs you have listed for LRN. L.O.L. Typos are funny, but reloading mistakes can be serious. This is why a lot of people are hesitant to post loads.

 

[coboblack]

lol I just saw that. Yea, I would never put 55.4 grains in a pistol round. I meant 5.4


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