S&W M28-2, 357 Magnum, High Pressure, Locked Action,

[Blue68f100]

When W296/H110 was first released in the 70's it had a "DO NOT REDUCE" attached to it. Then several years later they said you could reduce it by 3% max. This powder is for full mag loads only. If you want something else you will need to use another powder, like 2400.

 

[AJC1]

I have loaded up #9 to ten grains one time in 357 for a direct comparison to sw Hp. I don't like it that low and I had a standard deviation right about 50 which is not my happy place. Now 9 grains of #9 in a 38 case with a 180 is right at max +p territory and is gooder. My notes say 22kpsi. That should not give you any primer problems and the heavy bullet seems to help the lower loadings of #9 burn well. In a 357 mag north of 13 grains is good and my cast 158 is happy at 13.7. Hornaday is very restrictive and Lyman not at all.

 

[jmorris]

Yes, going below the Accurate #9 start load of 11.2 gr, may cause problems.

It would be interesting to test with proper equipment to measure what’s going on pressure wise.

FWIW the smallest minimum charge from the 30 year old Accurate 5th edition is 11.7 grains. So, if going under that causes problems, they created it when they reduced their load data.

 

[AJC1]

It would be interesting to test with proper equipment to measure what’s going on pressure wise.

FWIW the smallest minimum charge from the 30 year old Accurate 5th edition is 11.7 grains. So, if going under that causes problems, they created it when they reduced their load data.

Hornaday tenth starts at like 10.0 which is where my charge came from. I am unaware if any major formula changes that other powders have had like unique.

 

[jmorris]

The lowest charge in their 4th is 10.6 gn with a 180gn bullet.



I still have new “old stock” powders from back then, if I acquire the equipment someday it would be interesting to see if they act differently.

I can tell that old metal can W231 is not as clean as the stuff you can buy these days. Makes one wonder what other differences exist.

 

[AJC1]

The lowest charge in their 4th is 11.8.

View attachment 1109214

I still have new “old stock” powders from back then, if I acquire the equipment someday it would be interesting to see if they act differently.

I can tell that old metal can W231 is not as clean as the stuff you can buy these days. Makes one wonder what other differences exist.

Some how I missed we were talking 140s. 10 is for 158s. I apologize for any confusion.

 

[jmorris]

No problem, I was wrong anyway.

Here is the 158 data, again from the 4th Ed.

 

[243winxb]

Old post warning- Update. Primers sent to Winchester/Olin . Waiting.

Contacted Win/Olin 10-17-22. Calls & emailed a few times.

12-13-22 1862 primers picked up by a full size, empty tractor trailer.

Primers Arrived at Winchester on 12-15-22, by tracking.

1-20-23 Tried to get an update this week by phone & email. No reply.

Oh well, maybe by spring I may have some WSPM primers? Time well tell.

 

[johnjohn]

CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

Good i didnt use this 1992 data. Big difference. Note- different primer. The WSPM is said to add 5000 PSI? If you beleave the interweb?

View attachment 1077776 View attachment 1077777 View attachment 1077778 View attachment 1077779

 

[johnjohn]

I have that same manual maybe it's time to "can" it. Having said that I never load anything approaching a "max" load.

 

[243winxb]

Old post warning- final update.

Resolved- Win/Olin sent check for $155 for the 1862 primers I returned. $ .084 each.

Nothing for Hasmat, shipping or 6% sales tax I will have to pay again, to replace WSPM.

I was told, new primers would be delivered to me & I wanted new primers. Didnt happen.

 

[mkl]

I've reloaded both pistol and rifle for over 50 years. Not a high volume shooter, maybe 2000 rounds a year. I have always started the ladder test at the minimum in the current book. Also I usually use ladder steps of around 0.5 grain for rifle and 0.2 grain for pistol.

All that said, I have had over pressure signs appear half-way and two-thirds up the ladder! Primers falling out, gas blow back, case head expansion in excess of .002-inch, etc. A couple of times with rifle I would be blind in one eye were I not wearing shooting glasses. As best as I could determine none of the ka-booms were due to an overload mistake, just my gun was not the gun used in the loading book test or perhaps I had a different lot of powder than what the book used; maybe it was older; who knows but I'm almost positive it was not a double charge or other loader error.

Point of above is do not assume you can start in the middle or upper part of the loading book ladder. Start at the bottom and work up in small increments. I promise you that you will do that when you ignore this advice and get a ka-boom in your starting load which was "right in the middle" of the loading book ladder. I've not had many, but one is all it takes to make a "believer" out of you!!!