357 Magnum H110 Load Data Discrepancy?

357 Magnum H110 Load Data Discrepancy?

This is a discussion on 357 Magnum H110 Load Data Discrepancy? within the Reloading forums, part of the Defensive Ammunition & Ballistics category; I知 about to load up my first 357 Magnums ever. I bought box of 125gr Gold Dots to get some higher velocity loading, and I知 ...

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Thread: 357 Magnum H110 Load Data Discrepancy?

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    VIP Member Array Chuck808's Avatar
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    357 Magnum H110 Load Data Discrepancy?

    I知 about to load up my first 357 Magnums ever. I bought box of 125gr Gold Dots to get some higher velocity loading, and I知 going with H110 powder.

    I have the Lee manual and also referenced the Speer website for charge weights of powder. Of course you can expect some discrepancies, but these are far more than I expected.

    Per the Lee manual, the starting charge is 21.0 gr, and the max charge is 22.0 gr. Per the Speer website, the starting charge is 18.0 gr and the max charge is 20.0 gr. It seems strange that the Speer data has a max charge lower than the starting charge in the Lee manual. Is this a scenario where the Speer data is just very conservative? Should I just say 渡o guts no glory and load them from 18.0 gr to 22.0 gr?

    I値l be shooting them out of a Ruger LCR, so it痴 definitely going to give me some thump in the hand, but while I致e fired some Hornady XTP and some other budget 357 Mag, I致e never experienced a true super hot magnum load.

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    Distinguished Member Array Shootnlead's Avatar
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    I normally average them when there is a considerable difference and I am not familiar with either load...but that is just for me and I am not suggesting that you do the same as that is a decision for you, and only you, to make.
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    My old Speer #9 gives a max on H110 of 21.6 gr with a CCI 550 primer. Lists a muzzle velocity of 1589.

    I'd work up to 22 gr with no qualms.


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    Distinguished Member Array FLSlim's Avatar
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    If it were me, I would use the Speer data since you are using their bullet. One reason they may be a little lower in the charge range is the plating on the GD is rather thin. FWIW, Hornady gives a range of 18.0 to 20.0 with a magnum primer and an OAL tested for 125 gr GD of 1.580".
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    VIP Member Array Havok's Avatar
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    Do they list the same OAL? It痴 definitely possible that one is just more conservative than the other.
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    Most of the data Lee publishes come from other sources. I just looked at the Hodgdon web site, and sure enough, they list 21.0 to 22.0 gr of H110 for a 125 gr XTP. Set your sights on pistol reloading data | Hodgdon Reloading I'm sure that was the source for the Lee numbers.

    I shoot a lot of 9mm and 45 loads and have experimented with different bullet weights, powders and powder charges. When I crunch my chrono numbers, the Hodgdon is generally close to my results, so I would have faith in their data. Note the values published are for an OAL of 1.590".
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    VIP Member Array Chuck808's Avatar
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    I decided to load from 18.0gr up to 21.5gr in 3 different increments, a min, middle, and max. It gives me about 0.5gr of wiggle room from the book max. Only loaded up 3 of each weight because in this little LCR pocket rocket, my hand wont be able to take much more.

    Not sure when I will get to the range to test them, but I labeled them with a Sharpie, so no chance in getting them mixed up.

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    VIP Member Array Bad Bob's Avatar
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    Quote Originally Posted by Havok View Post
    Do they list the same OAL? It痴 definitely possible that one is just more conservative than the other.
    Not with H110/W296 powder. You have a VERY small window.
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    VIP Member Array Bad Bob's Avatar
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    Quote Originally Posted by Chuck808 View Post
    I知 about to load up my first 357 Magnums ever. I bought box of 125gr Gold Dots to get some higher velocity loading, and I知 going with H110 powder.

    I have the Lee manual and also referenced the Speer website for charge weights of powder. Of course you can expect some discrepancies, but these are far more than I expected.

    Per the Lee manual, the starting charge is 21.0 gr, and the max charge is 22.0 gr. Per the Speer website, the starting charge is 18.0 gr and the max charge is 20.0 gr. It seems strange that the Speer data has a max charge lower than the starting charge in the Lee manual. Is this a scenario where the Speer data is just very conservative? Should I just say 渡o guts no glory and load them from 18.0 gr to 22.0 gr?

    I値l be shooting them out of a Ruger LCR, so it痴 definitely going to give me some thump in the hand, but while I致e fired some Hornady XTP and some other budget 357 Mag, I致e never experienced a true super hot magnum load.
    I just loaded up some 135 grn Gold dots using Speer's data 18 grains of 296. They shoot great in my 640.
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    VIP Member Array Havok's Avatar
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    Quote Originally Posted by Bad Bob View Post
    Not with H110/W296 powder. You have a VERY small window.
    H110 is a really slow burning powder for pistol powder. Per Hodgdon, their minimum charge(21.0gr) results in a much higher pressure than some of their powders, and they also use a longer OAL than the Speer data. So while you say it痴 a narrow window, it痴 not so narrow that someone can稚 make more conservative data.
    a poor plan that is well executed will produce better results that a good plan that is poorly executed.

    This is America. I have the right to go places. You have the right to stay home. You have the right to be upset about me going places. I have the right to not care.

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    VIP Member Array Bad Bob's Avatar
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    Quote Originally Posted by Havok View Post
    H110 is a really slow burning powder for pistol powder. Per Hodgdon, their minimum charge(21.0gr) results in a much higher pressure than some of their powders, and they also use a longer OAL than the Speer data. So while you say it痴 a narrow window, it痴 not so narrow that someone can稚 make more conservative data.
    If you load too little you risk detonation and erratic , dangerous ignition.. H110/W296 are not powders to use with reduced loads. There are better powders for that. Minimum 21 grains for what? For my load it was a 17.5 to 18.5 grain window, I call that a small window.
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    I'll second that. Easiest way in the world to blow up a handgun is to get an H110/W296 load just a bit too low. I usually start my H110 loads off at around mid-range in the load data and I shy away from the minimum loads with these slow powders. Do not take this advise lightly. I'd recommend choosing a different, bit faster, powder for use with plated bullets. The H110 works great with jacketed bullets which you want to push fast but there are more suitable powders for plated and lead bullets.
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    VIP Member Array Havok's Avatar
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    Quote Originally Posted by Bad Bob View Post
    If you load too little you risk detonation and erratic , dangerous ignition.. H110/W296 are not powders to use with reduced loads. There are better powders for that. Minimum 21 grains for what? For my load it was a 17.5 to 18.5 grain window, I call that a small window.
    Where are you getting reduced loads from? I知 talking about loading within the parameters of the Speer data.
    a poor plan that is well executed will produce better results that a good plan that is poorly executed.

    This is America. I have the right to go places. You have the right to stay home. You have the right to be upset about me going places. I have the right to not care.

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    VIP Member Array Bad Bob's Avatar
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    Quote Originally Posted by Havok View Post
    Where are you getting reduced loads from? I知 talking about loading within the parameters of the Speer data.
    So while you say it痴 a narrow window, it痴 not so narrow that someone can稚 make more conservative data.
    That is what you said. There is no conservative load with H110. Here is the load data. There is a 1 grain window. I don't know how much experience you have loading with H110 but there is no fudge room for safe loads.

    https://www.speer-ammo.com/downloads...m_135_GHDP.pdf
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