.40S&W - IMR SR 4756 Recipe - Sanity Check Request


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sonick808
January 15, 2013, 10:19 PM
Greetings All,

Due to the powders becoming hard to get, I'm going to be using 4 pounds of IMR SR 4756 for my .40S&W and .45ACP reloads for the next, well, 4 pounds at least. Some say this is a great application for this powder, some don't.

Prejudices aside, liabilities aside and all that disclaimer stuff, I was wondering if some experienced folks could sanity check this .40S&W recipe:

I am using Rainier 165gr RNFP plated bullets. There is no direct data for these for SR4756.

Based on hodgdon loading data for .40S&W, I used the bullet lengths (not oal), the weights and lo-hi charges for each to arrive at an average of 7.7-8.2gr for a true copper jacketed bullet with a length of 13.92mm (my bullet length)

Now, being plated bullets, I subtracted 10% as suggested by Rainier, to arrive at a lo-hi range of 7.0-7.4 with OAL of 1.125"

So, I'm requesting a sanity check on this final recipe as my first lower pressure attempt:

Rainier 165gr. Plated RNFP bullet (13.92mm length)
IMR SR 4756 7.1gr.
CCI #500 small pistol primer
Light Lee factory crimp to prevent change of OAL during handling. Nothing major
Cartridge OAL 1.125

Sane ? Safe ? These are just opinions, not gospel, not liable, nothing of the sort. Just looking for anything egregious.

Sorry so long; I am borderline paranoid when it comes to a new load, especially when i have to invent it based on other bullet data.

Thanks!

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chris in va
January 15, 2013, 11:58 PM
Well, just looking at the IMR reloading data...

I think the 'BERB' stands for Berry's FP, which are also plated. It shows 6.8-7.8gr of 4756. I would verify what BERB actually means though, can't seem to find a legend anywhere on the site.

sonick808
January 16, 2013, 06:14 PM
..shameless bump..

anymore thoughts ?

rcmodel
January 16, 2013, 06:25 PM
BERB is Berry bullet in Hodgdon data speak.

They do have data for 165 grain BERB FP on the website.

http://data.hodgdon.com/cartridge_load.asp

It should be interchangeable with Rainer plated bullets.

The only caveat is to check the 1.125" OAL in your own barrels chamber to insure it isn't hitting the rifling leade.

rc

sonick808
January 18, 2013, 01:51 AM
chris & rc, thank you gents :)

I feel solid going forward with this data now. When i have the time to test it, totally different story..

All the best
J

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