Armory Sponsor
Posted: 8/29/2011 4:52:59 AM EDT
|
Hodgon data for the Marlin 1895 is HIGH.
H322 and a 300 grain HP start is 57.0 grains, and max is 62.0C... Speer has an identical recipe, andtheir max is 56.4 I believe.... Why on earth is there such a difference? I usually follow powder manufacturer's data, but its never THIS different. How high have you worked up your 45-70/300 grain loads? I'm nervous now... |
|
Quoted:
I'm guessing that the Speer data is for 45-70 trapdoor rifles, not for leverguns. If you look on Hodgdon's reloading data site, they show a max of 60.0grns for a trapdoor rifle. Steve, that is what I suspected also but it claims lever actions only in the Speer manual. Hornady 8th doesnt even list a H322 load for this combo, so its no help there. Could my answer lie in C.U.P.? Hodgon claims to limit max pressure at 40K, and speer doesn't actually list anything... Perhaps the more common 18-28K C.U.P. is what ATK is going by? 
|
|
That happens all the time, different manuals commonly have different information. Here's how to handle it, if you have two sources of information, start with the lowest starting load, then you can work up from there. If you have 3 or more sources, look at the middle range of starting loads. ALWAYS start with starting loads and then work up, DO NOT start with maximum charges, EVER! |
| A buddy of mine and I just compared a couple of books on .308 loads. I was surprised/alarmed at the differences until I looked at the test guns. His results were from a 1/10 twist barrel and mine were from a 1/12. Other than a 2" barrel length difference we couldn't find any major differences. I then discovered a section for .308s in my book with a 1/10 twist and the numbers were very similar. The 2" barrel difference could explain the small variation in reported velocities. So, check the test guns/conditions and see what they say the setups were. It could explain the variations. |
|
I didn't find the Speer book to be as helpful for 9mm and .45 loads as Lyman and Hornady. For pistols, IIRC, Speer's manual stops as soon as they found the "most accurate" (I haven't looked at their rifle data to see if they do the same). Since I'm not shooting their test gun, this does me absolutely no good. Especially so since my accurate loads haven't been anywhere near Speer's most accurate load. I want to know the min and max, and find the sweet spot for MY guns. Hornady 7th highlights the most accurate load, but at least they still give load data up to max. THAT is useful for me.
Needless to say, of the 3 manuals I own, Speer's gets opened last. Posted Via AR15.Com Mobile |
|
Quoted:
A buddy of mine and I just compared a couple of books on .308 loads. I was surprised/alarmed at the differences until I looked at the test guns. His results were from a 1/10 twist barrel and mine were from a 1/12. Other than a 2" barrel length difference we couldn't find any major differences. I then discovered a section for .308s in my book with a 1/10 twist and the numbers were very similar. The 2" barrel difference could explain the small variation in reported velocities. So, check the test guns/conditions and see what they say the setups were. It could explain the variations. The velocities isn't whats concerning me at this time (i can find those...) What concerns me is that Hodgons start load for H322 and my bullet is over the max load according to Speer's 1895 data. It's rarely so different between manuals... |
|
Quoted:
That happens all the time, different manuals commonly have different information. Here's how to handle it, if you have two sources of information, start with the lowest starting load, then you can work up from there. If you have 3 or more sources, look at the middle range of starting loads. ALWAYS start with starting loads and then work up, DO NOT start with maximum charges, EVER! Good advice here. |
|
You are looking at the Modern Rifles loads for the .45-70. Look above the load data and you will see this:
These data are for only Ruger No.1 and No.3 single shots, Browning 1885 single shots and Siamese bolt action rifles. Max pressure, 50,000 CUP. Do not use these data in either of the prior two sections of 45-70 data (Trapdoor and Lever Actions).
You want to use the selection from the drop down menu that says "45-70 Government (Lever Action Rifles)" for the 1895. Edit:Nevermind, you were looking in the right place. I'd work that up cautiously. |
| Different bullets being used even though they are the same weight. Different jacket construction. Different bearing surface. Possibly different seating depth/effective case volume. If you're using a Speer bullet, start with their data (unless the Hodgdon's data specifies a Speer bullet in which case I'd still use the more conservative starting value). |
Armory Sponsor