I have a steel M49 J frame that I have been shooting with the 158gr LRN, SWC and LHP bullets to try and figure out what loads will work in it.

The LRN at 570fps are super accurate with one load with 5 @ .54" as my best group as of this date.

The Lswc is my hot or +P test bullet and my one manual has 5.4 grs of Unique as a maximum 38 special loading.
I have tried 5.2grs of Unique but at 851 fps with a medium crimp it is very heavy on recoil.

With a LswcHP (FBI) bullet I finally have a 5.0gr load of Unique with a heavy crimp that hits 861 fps......... which is controllable with a fair grouping but 2" high.

With the same bullet and a different powder I have a load at only 822 fps but at poa and listed by Alliant as a safe 38 special loading.

Is this Unique load of 5.0grs going to be ok for SD use with light use in this revolver? I see lots of post were guys have 888fps or more fps in their snub nose guns. I don't know if I need more recoil and any more stress on the little J frame?

I tried to find some HS-6 but it is playing hide and seek with me..............2400 gave 835 in a max charge but had a "Shotgun" pattern and Universal maxed out at 824 fps but would not come near a poa.

Just funny how all the data is for a K frame ........... and very little if any for a J frame +P load........... or at least a maximum 38 special loading around 18,500 psi.

5 gr of unique with a 158 gr lswc groups nicely out of my k frames and did well from a pair of L frames too,but I start flinching when I use it in my model 60.

What distance are you shooting? 5.0 BE with a 158 is a standard max load for me.

David

I shot 10's of thousand's of rounds of 5 grns of unique with a 158 in my 38 Special Diamondback. Yes I had to send it back to Colt to be rebuilt, but not until I had shot over 40,000 rounds. Colt D frames are close in size to a K frame S&W.

Today I baby it because they are harder to replace and max out at 4.5 grns but still 5.0 was the standard for years for me.

Your mileage may vary.

__________________
SWCA 1646

Do we have anyone here who has shot loose a steel J frame? My FBI load replica using 158 grain swc with gas check over HS-6 averages 1025 fps out of a 3" M36 and 960 out of a 2" detective special. I believe the J frame will take more than my hand will.

It is often said that S&W ok's any steel frame revolver made after
1957 and model marked for +P ammo in the 38 spl. But this just isn't
true. If you read the ratings chart you will see that this applies to the
K frame guns but not the J frames. But many owners ignore this with
few consequences apparently. Personally I would stick to standard
pressure loads for practice and use +P loads sparingly, but that's
just me.

5.o of Unique was a STANDARD pressure load for decades in many manuals of pressure tested loads. I realize that some sources stop short of that now....and some exceed it. I have never seen a loose J frame....Given that some folks have run hundreds of the old 38-44 high velocity loads through their steel Chiefs Specials (ouch) I don't think that it is much of an issue.

Man, that’s some high velocities with Unique from your 1 7/8 inch J frame.

I know this thread is six years old but............

Yes the 5.0gr of Unique with a HEAVY crimp does give me a "FBI load" in my little snub nose and I do use the lighter load a 822fps for SD use for
less recoil and wear and tear.

The scary part is that, Lyman and others even state that 5.3 grains of Unique can be used and list it at 18,500 pressure .

I'll pass.

5.2 grs Unique and the 158 gr LSWC is a fine 38 Spl +P load as well. Shot many of them.