Load data for Rocky Mountain Reloading 147gr 9mm FMJ?

[lrrifleman]

For those that load this bullet, who's load data are you using for initial loads? The bullet profile is nothing like the Hornady 147s (data that I've been starting with).

As always, thanks in advance for your help!

 

[STORMINORMAN]

They suggest a MINIMUM OAL of 1.10 and that 1.13 should work for MOST 9mm chambers. Place one next to a conventional RN 147gr bullet and see how much they would penetrate into the case vs. the RN and go from there with a START load.

The issue isn't the flat point, it is the lead.

Cheers!

P.S. They are probably only a call or e-mail away vis-a-vis load data once you have an OAL that works for your barrel...

 

[rwsmith]

I experimented....

...with heavier bullets (up to 160 gr) in 9mm and did some searching around because data is scarce. But a good place to start would be the Lyman manuals. In number 48 it gives for a 147 TMJ:

6 - 7.2 grains of Acc#7 (Hodgdon says 6.7 grains is the max for a Golden Saber, 1.165" AOL)

3.7 - 4.5 grains of Unique (Alliant say that 4.3 is the max with a Gold Dot, 1.13" OAL)

4.5 - 5 grains of Power Pistol (Alliiant says this load is OK with a Gold Dot, min OAL 1.13")

3.5 - 4.1 grains of HP38/231 (Hodgdon says to use 3 - 3.4 gr. with an XTP at 1.10" OAL)

Lyman says all TMJ loads are 1.115" OAL.

With heavier bullets trending toward maximum load, I found it tough to get within the max OAL. The little bit of powder in a 9mm doesn't compress well at all and bulges the cases.

A nice surprise from all that experimentation was that heavy bullets and light loads of Acc #7 are VERY ACCURATE in my 9mms.

 

[BLUEDOT37]

The bullet profile is nothing like the Hornady 147s (data that I've been starting with).

Lyman says all TMJ loads are 1.115" OAL.

Bullet profile is a prime factor that dictates what the COAL" will need to be for the loaded round to chamber in your pistol's barrel without bullet-rifling interference.

Some 9x19 chambers have ample leade/freebore cut into them while others have none.

Bullets of the same weight, but having different profiles/ogives, will have different maximum COAL" in any given barrel.

.

 

[Yendor357]

The only way to know what you’ve reloaded is to get a chronograph. When I first got my Garmin Xero, I got a few surprises. I’ll reiterate; Unless you are chronoing, you don’t know. And shoot paper, 25 yards, 5 shots, from a rest.

Accurate No. 7 and a 147. Great combo. I run my 147s out of my Shadow 2, and my CZ75B right at 1000 FPS.

And, did I mention to get a chronograph? Get a chronograph.

 

[Alk8944]

The same load data and LOA as any other manufacturers FMJ bullet of the same style. Exact bullet profile doesn't mean anything.

 

[cracker57]

The same load data and LOA as any other manufacturers FMJ bullet of the same style. Exact bullet profile doesn't mean anything.

I have been taught that this is not true, please correct me if I am wrong. This is how it was explained to me.
if the ogive is different, the c.o.l. might have to be different to keep the bullet off the rifling. this could mean that the bullet needs to be seated deeper, which changes the capacity of the small 9mm brass. smaller case capacity does raise pressure.
always do the plunk test with your barrel.

 

[Rule3]

Which one to you have? The RN or the FN??

Just use data for a similar profile same weight bullet

Pistol Bullets | RMR Bullets

Read the descriptions

 

[WR Moore]

This is how it was explained to me.
if the ogive is different, the c.o.l. might have to be different to keep the bullet off the rifling. this could mean that the bullet needs to be seated deeper, which changes the capacity of the small 9mm brass. smaller case capacity does raise pressure.
always do the plunk test with your barrel.

The profile of the bullet may also cause you to adjust OAL to eliminate feeding issues. Since most 9s these days have feed ramps integral with the barrel, this is much less an issue.

You-or your gunsmith-can always carefully alter the rifling leade if necessary. Back in the day, putting a "wadcutter throat" in a 1911 .45 barrel was quite common.

 

[Nevada Ed]

With a heavy 9mm, 147 gr bullet, one needs to see if it works in your pistol.

Some do well with a long OAL of 1.165"

Mine however, start to develope problems when the long bullet is crammed down
the little 9mm Tapered wall case, past 1.12", with some brands
with different types of powders.

Stay safe.

 

[rwsmith]

There's nothing wrong.....

...with adjusting the C.O.L. outward as long as it doesn't exceed the maximum and works in your gun(s). I had some 'smallball' bullets one time that the profile was such that if you were .001" over the recommended length they wouldn't chamber at all. I think the profile was such that instead of being tapered like most RN bullets, it was spherical. Anyway, no more 'smallball' for me.