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I got this from Hodgden Reloading Data. They have the data for Winchester powders.


Case: Winchester
Twist: 1:16"
Primer: Winchester LP, Large Pistol
Barrel Length: 5"
Trim Length: .987"
Bullet Weight180 GR. SIE JHC


Grs.
Vel. (ft/s)
Pressure


Starting Loads
Grs.
Vel. (ft/s)
Pressure
Winchester
AutoComp
.400"
1.250"
7.0
1,119
29,800 PSI


Maximum Loads
7.7
1,199
36,000 PSI


Well that didn't copy well. I think one can get the idea though.
 
Warning: The data above is for a jacketed bullet, not a lead bullet. The charge weights are usually higher for a FMJ of JHP bullet. Since you are a new reloader I suggest you not use that data.

I have several sources for cast bullet load data including the Lyman Cast Bullet Handbook. Unfortunately they do not list AutoComp but they do list 13 other powders. If you have other powders available list them and I will see if data is available.

You can also email Hodgdon and ask them for data. They sometimes have data not published because of space constraints they are willing to share.
 
You can also email Hodgdon and ask them for data. They sometimes have data not published because of space constraints they are willing to share.

A very good idea. I know they are very nice. Even if you contact them a lot. :)
I put the bullet used in bold but forgot to mention it, trying to make it readable.:confused: (Yea. Computers. Wahoo.;))
 
Jacketed bullet data is not normally used for lead due to leading, not because of safety.

Lead bullets will give LOWER pressure than jacketed with the same load.

I would say go ahead and use the data as long as you do not get leading.
 
Warning: The data above is for a jacketed bullet, not a lead bullet ... I suggest you not use that data.

You can also email Hodgdon and ask them for data.
I agree
Lead bullets will give LOWER pressure than jacketed with the same load.

I would say go ahead and use the data as long as you do not get leading.
OP did not post specifics of lead bullet type (commercial or homemade), alloy mix, hardness, sizing, lube type, etc. and we need more information before posting OP could use jacketed load data for lead bullet, especially for high pressure caliber like 10mm.
  • Lead bullets typically tend to be sized .001" larger than jacketed bullets (to seal better with the barrel) which will INCREASE pressure than jacketed with the same powder charge.
  • Lead bullets are usually pushed slower than jacketed due to leading
If the bullets are .401" sized lubed lead FP, you could reference lower pressure 40S&W lead load data or plated load data for your 10mm initial powder work up using 10mm OAL/COL (Similar in principle for shooting .38 Spl loads in .357 Mag).

Compare the below load data for 180 gr Sierra Jacketed Hollow Cavity for 10mm and Berry's plated FP for 40S&W - http://www.hodgdonreloading.com/data/pistol
  • 10mm 180 gr. Sierra JHC AutoComp Dia .400" COL 1.250" Start 7.0 gr (1,119 fps) 29,800 PSI - Max 7.7 gr (1,199 fps) 36,000 PSI
  • 40S&W 180 gr Berry's plated FP AutoComp .400" COL 1.125" Start 5.7 gr (971 fps) 26,700 PSI - Max 6.2 gr (1,060 fps) 33,000 PSI
Keep in mind, you should use your barrel to determine max OAL and working OAL as many use 1.260" with 180 gr FP bullets - https://www.thehighroad.org/index.p...l-with-your-bullet.506678/page-2#post-8864541
10mm 180g Lead Flat Point with Winchester AutoComp ... Cant find load data
You could load 180 gr Lead FP bullet to 1.250" (or your max working OAL) with start charge of 5.7 gr and test 6.0, 6.2 gr and see which powder charge will start to reliably cycle the slide and then monitor for accuracy trends and leading. You can always go higher while watching leading of barrel.
 
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Using jacketed bullet data has been a standard practice for over a century.

Other than Lyman, most manuals do not even post lead bullet data. Why? Because any powder and charge safe with a jacketed bullet is safe with a lead bullet.

In fact, the older Lyman manuals point this out. I've been doing it for over 50 years without incident. It's been standard reloading practice for a century.
 
Using jacketed bullet data has been a standard practice for over a century.

Other than Lyman, most manuals do not even post lead bullet data. Why? Because any powder and charge safe with a jacketed bullet is safe with a lead bullet.

In fact, the older Lyman manuals point this out. I've been doing it for over 50 years without incident. It's been standard reloading practice for a century.
That's all and good for someone doing this for 50 years but new reloaders should be pointed at proper data or at least warned the data is not tested. Just because you do it doesn't make it right for anyone else, especially a new reloader.
 
And new reloaders also need to learn that you check several different manuals, especially Lyman. Individual Manuals are a guideline, not holy scripture. That's why we own, and check 3 or 4 of them.
 
And new reloaders also need to learn that you check several different manuals, especially Lyman. Individual Manuals are a guideline, not holy scripture. That's why we own, and check 3 or 4 of them.

When did I say anything else?

You seem to be one of those who like to argue, even when wrong. I will leave you to yourself because I have no time for drama. I also don't want the new member to think poorly of this forum.
 
Don't know about 10mm but Hodgdon's data for 9mm shows lead bullets of the same weight with a lower charge.
Always start low and work up.

Robert Heinlein Quote
"The most expensive thing in the world is a second-best military establishment, good but not good enough to win."
 
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