Need Maximum H110 Load for Speer 125 GDHP


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bjorgenson
December 26, 2007, 11:59 PM
I am looking for a proven, tested, recipe using H110, CCI 550, and Speer 125 GDHP bullets. I see a lot of users are using the 22.0 grains max using the 125 Hornady XTP which is listed on Hodgdon's website but what about the 125 GDHP?

Using a GP100 6"

Thanks,
BJ

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loadedround
December 27, 2007, 10:17 AM
Standard rule of thumb. Reduce your stating load for the Speer bullet by 10% and slowly work up a half grain at a time watching for pressure signs. BTW, the new Speer Manual #14 shows 18 gr of H110 as a starting load and a maximum of 20.0 gr of H110 for the 125 gr GDHP. I would use the Speer information to develop your load.

bjorgenson
December 27, 2007, 03:04 PM
Right, but you are not suppose to reduce H110 loads by no more than 3% of Max because of the possibility of hangfires.

This brings up another question, is it wise to adhere to a bullet manufactures loading data or the powder manufacture? I would assume the bullet as they would have pressure data tests for their respectfull bullet type. Not all 125 grain bullets are going to be the same as some may have more surface contact area than others producing different amounts of pressure.

I'll try out 20 grain's with the GDHP and see how it goes.

Walkalong
December 27, 2007, 03:17 PM
Reducing max loads of H110 by 10% in the .357 will not get you into trouble, but I would recommend that you at least start in the middle of data, after you get a good reloading book.

At least check the online data provided by Hodgdon. (http://data.hodgdon.com/main_menu.asp)

125 GR. HDY XTP 125 / H110 / .357" / 1.590"

21.0 / 1881 / 38,400 CUP

22.0 / 1966 / 41,400 CUP

rcmodel
December 27, 2007, 03:44 PM
but you are not suppose to reduce H110 loads by no more than 3% of Max because of the possibility of hangfires.But you are looking at Apples & Oranges.

The max load printed by Hodgdon with a cup & core JHP bullet will not be the same max load listed by Speer with a plated jacket GDHP.

The GD is a softer bullet, and the maximum is less.

With a softer bullet then Hodgdon used, you could reduce the load by 5% or 10% if necessary, as long as the pressure stays up where it is supposed to be.

If it does, H110 will burn just fine.

http://i81.photobucket.com/albums/j219/rcmodel/KTOG/1224.gif
rcmodel

loadedround
December 27, 2007, 05:19 PM
Guys: Do the math first. Reducing Hodgdons load of 22 gr of H110 by 10% equals 19.8 gr. Well within the range of the Speer Manual's recommendation of the stating load of 18 gr and maximum of 20gr. I see no problem or danger with the original advice. It's not necessary to split hairs here once you do the math. :) :)

ArchAngelCD
December 27, 2007, 11:49 PM
From what I've been told even though a powder manufacturer's site lists a Hornady XTP bullet the data is valid for all Jacketed HP bullets. They only list one bullet or another because of an agreement with the bullet manufacturer.

For the most part all Jacketed bullets of the same weight can use the data for a XTP bullet but of course you should always proceed carefully.

joneb
December 28, 2007, 12:01 AM
I recently got stumped on another forum regarding H110 :o I PM'ed UncleNick for help. http://www.thefiringline.com/forums/showthread.php?t=273126

FM12
December 28, 2007, 01:13 AM
DO NOT REDUCE THE LOAD! If you do, take a wooden dowel the proper bore size to drive out the squibs.

Use heavy bullets, heavy crimp, full loads and magnum primers.

bjorgenson
December 28, 2007, 02:39 PM
Thanks guys for the tips. I've been reloading for years now but mainly all magnum rifle loads. First time with the 357. I just loaded 50 last night using H110. Used a heavy crimp, CCI 550's. I loaded some 125 XTP's with 22 grains and the 125 GDHP with 20 Grains. If I have a new, modern gun, I like to use the max loads from the start. If you have the right components and gun, your typically safe. I will be watching for pressure signs to be safe.

The 125 GDHP's look like one mean bullet. Would not want to get hit by one. Will have to shoot through a few milk jugs to see what kind of expansion I can get.:evil:

ArchAngelCD
December 28, 2007, 11:38 PM
According to the Hodgdon load data site your charge for the Speer bullet is under the Minimum recommended charge. Why would you use a different charge for bullets of the same type and weight?

bjorgenson
January 2, 2008, 04:39 PM
Where on Hodgdon's site does it list loading data for the Speer GDHP bullet? I only see the Hornady XTP.

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