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Just getting into reloading

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Old November 9th, 2013, 12:56 PM   #1
 
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Why different Load data for same round from different manuals

I am just getting into reloading as the title states and obtained 2 different source manuals for reloading information as a lot of people suggested. So I obtained the "Modern Reloading by Richard Lee" second edition and the "Lyman Reloading Handbook" 49th edition. While looking over the reloading in both books for 45 ACP I found the following differences:


The bullet type info is what the different books state as the bullet type.


Modern Reloading by Richard Lee, page 573

Bullet Type: 230 gr Jacket Bullet
Powder - IMR x700 starting grains: 4.4, never exceed 4.9
Powder - Power Pistol starting grains: 7.1, never exceed 8.1

Lyman Reloading Handbook, page 382

Bullet Type: 230 gr TMJ
Powder - IMR x700 starting grains: 3.6 never exceed 4.8
Powder - Power Pistol starting grains: 6.4, never exceed 7.2

That is quite a difference between the two. Any ideas as to why the big differences? I don't want to load to low and not have my 1911 function, but also don't want to load to high and have a real big problem...




Last edited by kebwizrd; November 9th, 2013 at 02:20 PM. Reason: Change the title
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Old November 9th, 2013, 01:10 PM   #2
 
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Welcome.
I am not a reloading professional, but have done it for 10 years total. I am a big fan of Hodgdon powder. I am also a big fan of getting reloading data from the powder mfg's. The Mfg's websites are an excellent source. I also got Hodgdon's 2013 annual manual for reloading($8). It states for a 230 gr. FMJ bullet the same data you quote from Lee.(4.4 to 4.9) with an OAL of 1.200". I have noticed Lee tends to use the Powder mfg's data also.
I might also suggest getting " The ABC's of Reloading" It's very good. Good luck & go slow at first, you can always get faster later.

Last edited by moakes58; November 9th, 2013 at 05:00 PM.
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Old November 9th, 2013, 03:36 PM   #3
 
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Different manuals will show different results for several reasons. Different equipment is used (some may use actual guns and some may use universal receivers. Different barrels will give different velocities, even if they are the "same"), different powder lots of the same powders, and some use CUP standard and some use PSI, and even different technicians. Lee uses data from other sources and the TMJ is probably a different bullet than Lyman's Jacketed bullet.

Reloading manuals report what results came from specific components listed at the time of testing. Not hard formula.

If in doubt, always start with the lowest charge and work up a load that works well for your purposes.
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Old November 10th, 2013, 03:39 PM   #4
 
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Kebwizrd; The Lee manual,as has been said, uses Hodgdon data and Hodgdon and Alliant have always seemed aggressive and Lyman data seems to be conservative. You can use the Hodgdon data but start with the STARTING load, or go with your bullet manufacturer's data. Most all firearms treat individual loads differently and you will have to discover what your's like best. Get the manual for your bullet choice also as they all provide some insight to the hobby. Have fun and Be SAFE!
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Old November 11th, 2013, 05:13 AM   #5
 
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Interesting, comparison between the Lyman Reloading manual and the Alliant website reloading data as shown below.

The Alliant reloading data on their website only shows "charge weight" not a starting load and never exceed load, at least I could not find it.

Speer Bullet Type: 230 gr TMJ RN

Lyman Reloading Handbook, page 382

Powder - Bullseye starting grains: 3.8, never exceed 5.3
Powder - Power Pistol starting grains: 6.4, never exceed 7.2

Alliant website Reloading Info

Powder - Bullseye charge weight 5.7
Powder - Power Pistol charge weight 8.1
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Old November 11th, 2013, 05:18 AM   #6
 
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Kebwizrd: Typically when data shows only one load it is taken to be the maximum load and you back off by a recommended percentage,usually 5% by weight for the starting load.
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Old November 11th, 2013, 05:35 AM   #7
 
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Thanks for the quick response Bob and your previous info. As I am just getting into reloading I have been reading, reading, and reading. Problem is the more I read, the more overwhelmed with info I get.
I kind of thought the "charge weight" was the max. Even after reducing the max of the Bullseye powder by 5% (5.7 - 5%) =5.415 it still exceeds the Lyman max of 5.3 by .115.
I'm just thing that since I am starting out to be more conservative with loads and go with the low end in the Lyman manual. Any thoughts and other info would be greatly appreciated.
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Old November 11th, 2013, 06:22 AM   #8
 
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I started reloading at the age of 16 in the mid 70's , Last summer I loaded over 5000 230gr 45ACP rounds plated and lead. First off always check your load data in the powder mfg's book or web site. That said I like the 230gr Berry's RN with 4.0 gr Titegroup @ 1.24 oal this load runs at 788fps with my chrono through my SR1911. A lead 230gr RN from Mo bullet with the same charge runs about 800 fps.
Start slow and always recheck your powder throw often . Good luck
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Old November 11th, 2013, 07:21 AM   #9
 
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You will find that some manuals are more agressive then others. I feel it is just c.y.a for the legal dept. The big factor is the make up of the bullets! Each mfg uses different types of metal in their bullets also with different thicknesses, this will cause different pressures between mfg. Standard back off for max loads is 10%. However be very cautious about reducing starting loads! With some powders that can be as dangerous as over charges! Here is my advise to you! Follow the books data for a given bullet and powder data! If you are using Hornady xtp then use data for that bullet! After you have been at it for a few years you will be able to recognize when the pressures are on the high side! If you are buying off brand bullets and cant find any data on them just weigh them and use starting data for that weight and work up. Do not let it get to you! Follow the recipe and you will be good! Reloading should be fun and rewarding! I have been reloading over 30 years now casting as well and outside of shooting them it is my favorite hobby! Also for $20 a year you can join Load Data .com! I have all the manuals but load data is my first stop for data anymore! They have almost any data you will ever need on any caliber! Good luck!
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Old November 11th, 2013, 07:54 AM   #10
 
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Whenever I encounter data, from a reputable source, listed in one charge, I reduce the listed charge by 10%.

BTW/FWIW, I pay very little (read no) attention to any reload data from any forum, gun shop guru, range rat, gun counter clerk, or "reloader's" website (except powder mfg's. sites, but that is rare). I have read and overheard some really questionable "pet" loads that I wouldn't shoot in my guns. For my reloading, for nearly 30 years, 99% of my data comes from one or more of my 8+ reloading manuals...

Reloading is an extremely satisfying and fun hobby and there is tons of info available, mebbe too much for a beginner. My advise is to K.I.S.S. and not overthink the process. Relax, stay with "book loads", and most important; have fun!

Last edited by mikld; November 11th, 2013 at 10:58 AM.
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