4.5 grains Unique and Speer LSWCHP.
I never load that hot.
I've used plenty of HS-6 with a 160 gr. LSWC ( Hensley & Gibbs #51) in the .38 Special cartridge. I've never used 7 grs. and won't. It's probably best for all of us to check with reputable sources (the real experts) rather than Internet experts regarding safe maximum loads.
The Hodgdon #26 load manual from 1992 lists the max charge of HS-6 under a 158gr LSWC bullet at 7.3gr for a velocity of 955 fps and 19,200 CUP. My charge of 7.0gr HS-6 is not the max charge and that's from a reputable source.
Additionally, some older Winchester manuals show loads for W540. It's known W540 = HS-6 so when I saw the data listing 7.2gr W540 under a 158gr LSWC being just under the 20,000 PSI SAAMI limits I knew my 7.0gr load to be safe. Another reputable source from before the merge of both companies.
You are correct, you should always verify all data you get from the Internet from people you don't know.
Full load...equals the original .38-44 load...
Home cast Lyman/Thompson 357156 with 6.0 grains of Unique. Have both the original Lyman mold, a MP Mold that can be used solid, HP and PentaPoint as well as a MP aluminum mold that is a non-gascheck.
Runs in the mid-900s from a 649 2" to 1140 from a 4" Heavy Duty. It is just a little slower than the Outdoorsman load in solid and HP from Buffalo Bore.
For just target shooting and plinking, 4.0 of 700-X with most any 150-160 SWC works great and is cheap...
Bob
ps...as far as the SAAMI limits go...can someone please tell me why a J-frame can be chambered in 9mm at over 30k psi but everyone wets their underwear when someone goes to 26k in a .38 Special in the same gun...what am I missing?
You also make good points but current data is not always lower because of better testing methods.You make a good point. The old load manuals are great reference sources; guess I have between forty and fifty of them and refer to them regularly. As you well know, much of the information is not available online.
The method of pressure measurement may be considerably more accurate today and less dependent on operator interpretation than it was when #26 was published about thirty years ago; another good reason to be cautious with old data. There is also a suggestion in #26 that the data is not recommended for small frame (presumably including steel) and alloy frame revolvers.
You also make good points but current data is not always lower because of better testing methods.
Right now on the Hodgdon Load Data Site they list
In the .38 Special data with a 158gr LSWC bullet they say the max is 6.3gr HS-6 with pressures of 16,200 CUP.
In the .357 Magnum data with a 158gr LSWC bullet they say the max is 7.0gr of HS-6 with pressures of 15,500 CUP.
I find those numbers to be strange. The .357 Magnum case is only slightly longer yet .7gr more powder generated less pressure than the .38 Special. That is hard to believe. Also, only 15,500 CUP in a .357 Magnum round, not hardly a Magnum, is it?
For me it's 11.5 grs of 2400 under a Lyman # 358156 SWC HP with a gas check.
HS-6 works wonders in .38 Special +P. But current published loading data is so watered down that it stops well short of the pressure limit.
Speer Number 8 (aka "The Atomic Manual") lists the starting load as 7.0 grains of HS-6 under 158 grain lead bullet. That load exceeds the lame maximum charge on current Hodgdon website. The Speer Number 8 maximum was 8.0 grains... I've tried it and it's full power no doubt.
There are those who go into a catatonic trance and scream when Speer Number 8 is mentioned. Fine. Speer Number 10, published in 1979 (back when +P actually meant something) writing in the .38 Special section, states "+P working pressure is 22,400 cup."
SAAMI later watered down the .38 Special +P specification. In its 2015 publication, "American National Standard Voluntary Industry Performance Standards for Pressure and Velocity of Centerfire Pistol and Revolver Ammunition for the Use of Commercial Manufacturers", the pressure spec for .38 Special +P was lowered to 20,000 CUP. The nominal velocity for a 158 grain bullet is listed as 880 fps from a 4" vented test barrel.
Based on the performance of some historical hi-speed factory loadings (158 grain bullet at ~1090 fps), the "new" .38 Special +P level is fairly weak sauce.
Take a look at the current Hodgdon HS-6 data for .38 Special with 158 grain cast bullet, and it stops at 16,200 CUP. Having tried Hodgdon's low pressure .38 Special HS-6 loads, the results are dismal - unburnt powder, low velocities, mediocre accuracy. It's obvious how watered down the Hodgdon HS-6 data is in .38 Special. No data is provided for +P loads with a 158 grain lead bullet. Why?
Oddly enough, Hodgdon decided to provide 158 grain cast bullet data for .357 Magnum: 7.0 grains of HS-6 gives only 15,500 CUP. Hmmmm, something fishy is going on here...
A little bit of analysis indicates that whether you intend to stay within the current 20,000 CUP +P limit, or the traditional pre-watered 22,400 CUP limit... you can increase the charge accordingly. Pop a magnum primer in the .38 Special case, and bump up the powder charge to normal levels and you have something really good. My personal HS-6 loads with 160 grain LHP bullets make 985 fps in 4" barrel revolver, and 900 fps in a 2" gun. The loads are very accurate and hit POA in fixed sight revolvers.
Buffalo Bore sells loaded factory ammo at these levels. Their choice of powder is unknown, but obviously the pressure levels are safe.
Note these pressure figures are for copper-crusher CUP, NOT transducer PSI. The numbers are not the same. Hodgdon still lists its 38 Special and 357 Magnum pressure data in CUP... I'm surprised because you are now able to see how weak these loads have become since the SAAMI downgrading. Once pressure figures are expressed in PSI, you have no way of comparing them to older CUP data.
As always, YMMV, and practice safe and prudent loading practices. Inexperienced reloaders should adhere to published data. What is acceptable in your guns is YOUR RESPONSIBILITY.
Happy trails!
Maybe my 2008 bottle of 231 is getting old......