Reloading Data Discrepancy

[Bowhunter57]

I have a Hornady reloading manual that was published in 2016. I was reading through it for some reloading data for a .357 Mag.
It shows Accurate #9 for a 110 gr. JHP @
12.6 grains @ 1300 fps
13.3 grains @ 1350 fps
14.0 grains @ 1400 fps
14.8 grains @ 1480 fps as a Max. or Red Load.

So, using the online reloading data from Hodgdon's Data Center page, shows this for the same bullet weight:
15.3 grains @ 1478 fps as a Starting Load.
16.9 grains @ 1677 fps as a Maximum Load.

In my opinion.... I would say the online data is more current and/or more accurate as a guideline for max. loads, pressure data, etc. Just the same, I've been using reloading manuals, in as current of a publication as possible and never gave it a second thought. 2016 isn't that long ago and I think it's still safe, but the reloading component companies are always testing stuff and that's a good thing.
What's your thoughts and experiences on this thought?

 

[Left field]

I don’t reload but have some reloading manuals , I have the Lyman49th, 1st edition 2008-2015 I know them or Hornady came out with a newer version , have also heard what you saw online

 

[Ohiosam]

The reason I have a bunch of reloading manuals is because of differences like this. First they are using different test guns. Second any change in any Component (brass, bullet, primer) makes a difference. 2 bullets of the same weight can have different shape and/or construction which can affect pressures.
I put more faith in printed manuals than those online. Not sure that’s based on anything other than being old.

I’ll check some of my manuals later and share the info.

 

[Ohiosam]

Here is Sierra’s from 2003. Test gun was a Colt Trooper MKIII. Starline brass, CCI -550 primers

 

[Bowhunter57]

@Ohiosam
Thanks, I appreciate it. I'm with you on both being old and trusting written data vs. online stuff.
I have a Lyman 50th Edition, Hornady Handbook of Cartridge Reloading, Modern Reloading by Richard Lee and a very old version of Sierra Bullets that I've had and added supplements to it since 1977. The first 3 are decent manuals, but the last one is definitely out dated, but has some good reading on cartridge history.

I ended up loading some 110 gr. Hornady XTP bullets with 14.5 gr. of Accurate #9, which will be in the ballpark of 1400ish F.P.S. This will work fine for varmints. I need to get out to the rifle range and put these loads on paper, to see how they group and sight them in with my Holosun.

 

[P8riot]

Agreed. I have 3 different manuals and then check with the powder maker. They are all different. Barrel length is a big x factor in their #s as well. I just pick a nice safe average to start and test. If it's safe in all the data references, it's bound to be OK.

 

[Left field]

Hogdon puts out annual reloading manual every year , they have a website that you can enter the caliber you want to load so don’t have to buy the manual https://www.hodgdonreloading.com/reloading-data-center

 

[Bowhunter57]

@Josh carpenter
Yep, that's the one I was referring to for online data.

Well, it didn't take long to get my Ruger GP-100 sighted in with the new reloads. 1" groups at 25 yards was impressive and going to be plenty good enough for g-hogs and other misc. varmints.