I was looking thru my manuals last night. I know people that doesn't work up loads but looks at the "accuracy" loads manuals like Sierra and nosler give.
So looking at my 45-70 loads in my Sierra 4th edition, they have three different sets of data.
Data 1 for 1873 Trapdoors
IMR4198 31.1gr-36gr (1450-1650fps respectivly) Accuracy load:33.6gr
Data 2 for 1886 Winchesters, sharps, and rolling blocks
IMR4198 36.3gr-41gr (1550-1800fps respectivly) Accuracy load:39.2gr
Data 3 for 1895 Marlins and Ruger No. 1 and 3's
IMR4198 47.4gr-51.8gr (1950-2150fps respectively) Accuracy load:49.6
All accuracy loads are smack dab in the middle of the range given and all hunting loads given are at the extremes. This doesn't make sense. So from this data, you can load a range of 31.1gr to 51.8gr of IMR4198 in a modern 1895 Marlin. How can you have three accuacy loads. I mean the brass is the same, sure the barrels in teh test guns are different, but not vastly. So basically the accuacy load is bull. I tried explaining this to my new reloader friend but he still insists.
I discovered this myself early on in my reloading career.The supposed accuracy loads listed in the manuals are seldom the most accurate loads in my guns.Each gun is an individual so no person can reliably predict the most accurate load in a given gun.
bigcountry-You must have misread the statement of mine that you quoted.I stated
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so no person can reliably predict the most accurate load in a given gun.
The loads that you refer to may be accurate in your rifles,but are they "the most accurate load" in those rifles?As to your 300ultramag load using 180gr partitions and h-1000,neither of my 300ultramag rifles shoot accurately with this combination of powder and bullet in powder charges from 92gr to 96gr.
I believe you fine tune your rifle much more carefully than I. I usually work up a load in 1-2gr increments. find somthing to work with, and if its subMOA, I stop right there. Some guys keep going up in .3gr increments to wring out all the velocity and Accuracy they can. Then they will go further and start moving up in .005" COL to really fine tune. I am lazy however.
It is my understanding that designated accuracy loads in loading manuals actually have nothing to do with shooting tight groups, but are a function of the narrowest standard deviation of velocity when running chrono tests. The inference is that a load that is more consistent in terms of speed will generally group better than one that has some extreme highs and lows. But it doesn't always work out that way . . . .
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It is my understanding that designated accuracy loads in loading manuals actually have nothing to do with shooting tight groups, but are a function of the narrowest standard deviation of velocity when running chrono tests. The inference is that a load that is more consistent in terms of speed will generally group better than one that has some extreme highs and lows. But it doesn't always work out that way . . . .
I could see that. but look at my example. So for three different guns, your lowest spread is smack dab in the middle of the pack every time? Maybe its sierra. I used to really like them. But some of thier data makes me say what are they doing.
Maybe they just got lazy when designating an accuracy load for that cartridge.
I agree that there are some loads that generally work very well in just about any rifle.
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The trapdoor,the 1886 win have a different breech pressures then the other rifles you stated. those ljoads are for that gun,Not all guns in that cal. The others mentiioned have different breech pressures also.so your variance is correct with them, BUT you can,t compare those different type guns with the other loads. Thats why YOU see the big differences. Your misreading the info.your combining apples and oranges if you know what i mean. i hope thhis helped. vangunsmith
Not at all. Your misreading the data vangun. Everybody pretty well understands pressure differeences of the different actions. Thats not the question or the answer we are searching for. But a action's pressure abilities is entirely a separate issue to accuacy loads. See the original post. If an accuracy load for a trapdoor is 32gr, why not for a 1895 lever??? The action's ability to handle pressure should not be a bearing for its accuracy. I am sure the action has a certain effect. '
Accuracy Loads full of it?
