Loading data for 9mm 147gr LCRN


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fnhjim
January 7, 2012, 11:16 AM
I have been looking for load data for 9mm 147gr LCRN

I am currently using Power Pistol 4.5 OAL 1.150 @ 1000 ft/sec
This data works for Rainer 147gr safe-lead

I am going to start loading Missouri Bullet Company 147's Brinell 15 they are shorter than Rainer and I am sure how deep to seat them.

Also if you have any other powder choices feel free..

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rcmodel
January 7, 2012, 12:20 PM
Take the barrel out of your gun and use it to chamber check seating depth.

Seating as long as you can without the bullet ogive hitting the rifling leade usually feeds best in most guns. You may have to seat deeper to fit the magazine with that bullet design though?
Your milage my vary.

rc

fnhjim
January 7, 2012, 12:33 PM
Thank you that is always a good thing to check. What I was looking for was more along the lines of pressure

beatledog7
January 7, 2012, 01:17 PM
RC is right. With lead bullets in semi-autos, your barrel will determine OAL. This is because lead bullet ogive profiles are all over the place, a fact I learned the hard way.

Use a bullet and an unprimed case to determine the longest OAL (shorten and test the round in tiny increments and remember that a taper crimp may also be required) that allows the round to drop into and fall out of your barrel. Now shorten it by a couple thousandths to get it off the lands. Check to make sure it will fit in your magazine and will chamber from the mag.

Now you have a functionally-sized dummy round loaded with your desired bullet. It might be considerably shorter than any other round you've loaded. You can use published or self-tested load data to start, and adjust accordingly as follows:

Take a trusted low-moderate power jacketed load and measure the length of the completed round (you should have this recorded). Now measure the length of the bullet used in that round. Subtract the bullet length from the OAL; that's the distance from the case head to the base of the bullet inside that trusted round. Let's call that number CH-BB.

Now do the same with the dummy round you just made. Is the CH-BB of your dummy round shorter than your trusted round? That means you'll need to adjust the powder load down by about the same proportion.

For example, if CH-BB of the trusted round is .800" and CH-BB of your dummy round is .720", you have roughly 10% less useable case volume in your dummy round and should use about 10% less of the same powder to achieve the same pressure. And since the trusted round was jacketed and your dummy is lead, adjust the charge down by another 5-10%.

If the dummy round's CH-BB is xx% longer, adjust the powder charge up by xx% and then down by 5-10%.

This method assumes similar base shapes for the two bullets and does not take into account the fact that the web portion of CH-BB does not contribute to useable case volume. But since you started with a low-moderate power load, it gets you close enough and is safe.

fnhjim
January 7, 2012, 01:32 PM
Okay excellent, this is why I joined the forum.

One question. I see where you are going with pressure and depth but since all 9mm have a max OAL of 1.169 would it not be easier to start there or am wrong about the max OAL?

fnhjim
January 7, 2012, 01:44 PM
Forget my replay I just reread post and I see where you are going. I will try it, thank you very much.

zxcvbob
January 7, 2012, 01:47 PM
Measure the bullet length of the ones you are using now, and the new ones. Let's say your old bullets are .650" long and you are loading them to an OAL of 1.12" And your new bullets are .683" Seat a new one to (1.12 - .650) + .683" and see if it feeds and chambers OK (1.153"). If it does, because the bullets are the same weight, your old load data should still work; or at least be really close.

You should still back off a little and work up to it if your old load data is close to max, because the bearing surface and the friction will be different with the new bullets.

fnhjim
January 7, 2012, 01:53 PM
Very good. I will check it at the range next week.. Thanks again!

beatledog7
January 7, 2012, 01:57 PM
Max OAL is meaningless WRT the lands of your particular barrel, your mag dimensions, and your gun's ability to chamber a round from the mag.

Similarly, using a trusted load as I described does not rely on that load's relationship to the lands of your barrel; we're trying to match that trusted round's pressure, not its distance off the lands. The round we're trying to get just off the lands is your new one.

J_McLeod
January 7, 2012, 03:09 PM
I am going to start loading Missouri Bullet Company 147's Brinell 15 they are shorter than Rainer and I am sure how deep to seat them.

Also if you have any other powder choices feel free..

I've shot a box and a half of these and love them with 4.8gr of HS-6.

918v
January 7, 2012, 03:27 PM
You can seat these from 1.100" to mag length with that load. Make up some with different OALs and shoot them off a bench rest to see which one is most accurate.

fnhjim
January 7, 2012, 06:29 PM
Hey quick range report.

147gr MBC LCFN
Power Pistol 4.5
OAL 1.169 by above formal
Gun FNX 9mm

good grouping from 15 to 25 yards. No key-stoning, very clean rounds holes. Our machine had then about 1,005 ft/sec (it was winding ranged from 1,000 to 1,010 ft/sec)

Thank you guys very much. I would have spent many hrs and rounds figuring this out..

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