How to adjust powder charge for coated bullets?

[Hockey7711]

I have some coated 115 Grain 9mm bullets that I want to load.
How would the powder charge compare to hard cast lead or a jacketed bullet?
I'm using Hodgdon Universal.

 

[ColtPythonElite]

I use cast data.

 

[Hockey7711]

thanks

 

[mdi]

I too have always started with cast lead data. I have gone to max cast lead levels, but just experimenting, and now just use my "normal" lead data...

 

[forrest r]

Another cast bullet data user

 

[CQB45ACP]

I use any lower end lead, FMJ, plated, coated data interchangeably for all 45ACP loads. And because I’m easy prey for good advertising, I use Sport Pistol exclusively for coated bullets.

 

[lordpaxman]

I too use cast data when it’s available. If none is available I use (.9 * Jacketed).
My chrono results with coated show they fly faster than lubed lead with an equivalent load. Good luck.

 

[fxvr5]

Might be some useful information in this article:
https://www.ssusa.org/articles/2017/3/7/coated-bullets-the-future-of-lead-bullets-for-handloaders/

They found the coated bullets were a few fps slower than regular cast bullets.

 

[reddog81]

Take cast bullet data add 20% and then multiply by 5/6.

 

[brewer12345]

In 45 I switched from tumble lubed cast to coated and used the same charge. Got the same results.

 

[Jim Watson]

My method:
Load a few rounds each with about 4 different powder charges across the range of book data.
Fire over chronograph.
Pick the load with the velocity I want (to give power factor 130 or so in 9mm P) and standardize on it as long as those components last.

 

[Bfh_auto]

I use anything from cast to full power jacketed data.
At lot depends on the overall goal.

 

[BBarn]

Take cast bullet data add 20% and then multiply by 5/6.

 

[mdi]

Take cast bullet data add 20% and then multiply by 5/6.

Close, but one must also add 1.347% for red powder cured in a 412.6 degree convection oven, and drop charge for a velocity running around the speed of sound with slow powder charges that run no less than 87.5% of case capacity with exact case length and depending on crimp applied with a left handed turret press only. This formula is used mostly in the Northern Hemisphere during clear weather running normal Texas ambient temperatures five days prior to a tornado coming from western Mississippi only.

 

[Zendude]

Ladder workup using cast data