Your MP357-125-HP Pet Loads

[jdgabbard]

I thought it might be nice to have a thread with members current favorite loads for the MP357-125-HP. Or even the NOE equivalent, since there seems to be a few versions of this boolit out there.

Personally I use this in 9mm and 38spl. My two favorite loads are below. The 38spl load is VERY accurate in my 38 snubbies. But has a lot of flash. The 9mm load is very accurate and probably about 1050fps from stand 4” guns.

38spl
5.0gr Unique
Generic SP Primer
OAL 1.510” w/ heavy crimp

9mm
4.5gr Unique
Generic SP Primer
OAL 1.110”

https://uploads.tapatalk-cdn.com/20230403/8006fc7209312319ce43a4d7756a71dc.jpg


Sent from my iPhone using Tapatalk

[Recycled bullet]

For 9x19 I use 4.3 grains of Auto Comp and 5.5 of Power Pistol.
https://uploads.tapatalk-cdn.com/20230403/eaac871a5873e2489e939036779dafdf.jpg
For 38 Special I use 5 grains of Trail Boss or 6.5 grains of AutoComp.

[jdgabbard]

Surely with the multiple group buys of this boolit and it's variations there are more than two of us that load for it.

[Wheelguns 1961]

I have the NLG version, and they come out at 135 grains with my alloy. I worked up to 4.4 grains of unique. It is a great load. COL is 1.085”.

[Forrest r]

5.0gr of wst makes bugholes in targets @ 50ft with this bullet in a nm 1911 chambered in 9mm.

[jdgabbard]

I have the NLG version, and they come out at 135 grains with my alloy. I worked up to 4.4 grains of unique. It is a great load. COL is 1.085”.

I am assuming that the 135gr is without using the HP pins, correct? How hot is that 4.4gr at that weight? My Penta pins drop at about 127gr, and 4.5gr is moderate.


5.0gr of wst makes bugholes in targets @ 50ft with this bullet in a nm 1911 chambered in 9mm.

It definitely shoots better than I do if I do my part at the reloading bench. A very accurate design for sure.

[Recycled bullet]

https://uploads.tapatalk-cdn.com/20230407/04be76fc0fa7c80b28594d8d650f0ae6.jpgThese are cast of Lyman #2 alloy and coated with Ford light blue by Eastwood. They are the last of the ones I have handloaded with Power Pihttps://uploads.tapatalk-cdn.com/20230407/659d4e92a454928ab615f2b4080ac7a2.jpgstol.

[Wheelguns 1961]

[QUOTE=jdgabbard;5560865]I am assuming that the 135gr is without using the HP pins, correct? How hot is that 4.4gr at that weight? My Penta pins drop at about 127gr, and 4.5gr is moderate.

This is with the lg hp pin. My alloy is 50/50 +2% tin. I size them to .358”. I was looking for a load that would shoot accurately, and function well in all of my 9mm’s. I started at 3.8, and went as high as 4.6. I didn’t have any pressure issues, but at 4.6, it would leave a small amount of lead behind in one of my barrels. At 4.0, it started getting more accurate, and kept getting better the higher I went. It is fairly moderate. I haven’t chrono’ed it. This was several years ago.

[jdgabbard]

[QUOTE=jdgabbard;5560865]I am assuming that the 135gr is without using the HP pins, correct? How hot is that 4.4gr at that weight? My Penta pins drop at about 127gr, and 4.5gr is moderate.

This is with the lg hp pin. My alloy is 50/50 +2% tin. I size them to .358”. I was looking for a load that would shoot accurately, and function well in all of my 9mm’s. I started at 3.8, and went as high as 4.6. I didn’t have any pressure issues, but at 4.6, it would leave a small amount of lead behind in one of my barrels. At 4.0, it started getting more accurate, and kept getting better the higher I went. It is fairly moderate. I haven’t chrono’ed it. This was several years ago.

Wow, that is a little heavier than the Standard Lube Groove version. But I agree, it tends to shoot better the heavier the load. I have found that I do not get leading, but I do get what can best be described as PC smearing in the barrel. It comes right out with a bore brush, doesn't build up, and doesn't affect accuracy. Think about the debris you get from sharpening a green stick on a rock...it's kinda like that... But it is interesting to note the difference between using Lubed Boolits and the PC boolits in the 9mm.

[Wheelguns 1961]

I think that the reason for the leading was probably an imperfect barrel. The gun was a ruger sr9c. It was just a trace. Since it didn’t happen with the 4.4 grain load, and that load shot very good, I just decided to leave well enough alone. Most of my 9mm shooting is now from a 5” ruger sr1911. Shown here with my model 25

[Recycled bullet]

My 125HP bullets cast from my alloy weighs 123.5 grains.

They are delightful to shoot in my Ruger Blackhawk.

[KVO]

312939
Seems like we are all finding the same performance window of ~4.5gr Unique or equivalent burn rate.
I've been loading the NLG version with either 4.5gr Autocomp or CFE Pistol interchangeably as a standard 9mm load. Hovering right about 1000fps from a P365XL (AutoComp above). Gel test done yesterday. Green are 20:1, Blue low antimony with tin (SWAG ~2% antimony ~2% tin)