Lee 358-105-SWC in 9mm & 357Mag, my results

[iMigraine]

Bought my first Chrono to test my cast boolits.

Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.018 to 1.010
TiteGroup 3.7gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 17
Extreme Spread: 63
Average Velocity: 1121
Standard Deviation: 16
Average Power Factor: 121.8

Temperature: 60°
Barometric Pressure:30


Then I made some puff loads for 357Mag.


Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr
COAL 1.550
TiteGroup 3.7gr

Using S&W 686 357Mag 6” barrel

Number of shots: 13
Extreme Spread: 93
Average Velocity: 827
Standard Deviation: 26
Average Power Factor: 89.7
Temperature: 62°
Barometric Pressure:30


Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr
COAL 1.550
TiteGroup 5.0gr

Using S&W 686 357Mag 6” barrel

Number of shots: 14
Extreme Spread: 74
Average Velocity: 1019
Standard Deviation: 23
Average Power Factor: 110.6
Temperature: 62°
Barometric Pressure:30

As I get the chance to test more, I'll post my results here. Maybe others with there chrono results can post here as well.

[iMigraine]

Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.010 - Failure to feed in SA 1911 9mm
CFE Pistol 4.7gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 11
Average Velocity: 1105

Average Power Factor: 139

Temperature: 86°
Barometric Pressure:30

--------------------------------------------------------------------------------------------

Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.010 - Failure to Feed
CFE Pistol 5.0gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 9

Average Velocity: 1200

Average Power Factor: 130

Temperature: 86°
Barometric Pressure:30

Problems with Chrono in bright sunny weather. Wouldn't read boolits till I Sharpied them black.

--------------------------------------------------------------------------------------------
Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.008 - Failure to Feed
Bullseye 3.8gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 10
Extreme Spread: 43
Average Velocity: 1097
Standard Deviation: 13
Average Power Factor: 119

Temperature: 90°
Barometric Pressure:29

--------------------------------------------------------------------------------------------
Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.020 - Failure to Feed
Unique 4.4gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 14
Extreme Spread: 96
Average Velocity: 1051
Standard Deviation: 25
Average Power Factor: 114

Temperature: 91°
Barometric Pressure:29

--------------------------------------------------------------------------------------------
Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.010 - Failure to Feed
IMR PB 3.3gr

Using Springfield 1911 9mm Range Officer 5” barrel

Number of shots: 12
Extreme Spread: 98
Average Velocity: 931
Standard Deviation: 24
Average Power Factor: 101

Temperature: 91°
Barometric Pressure:29

So, my COALs caused a lot of Failure to Feed problems.

[iMigraine]

357Mag loads:

Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.585
Bullseye 7.4gr

Using S&W 686 6” barrel

Number of shots: 12
Extreme Spread: 81
Average Velocity: 1352
Standard Deviation: 25
Average Power Factor: 147

Temperature: 91°
Barometric Pressure:29

--------------------------------------------------------------------------------------------
357Mag loads:

Lee 358-105-SWC
Powder Coated
Using isotope lead with 2% tin so my boolits weight 109gr

COAL 1.585
TiteGroup 7.5gr

Using S&W 686 6” barrel

Number of shots: 9
Extreme Spread: 69
Average Velocity: 1379
Standard Deviation: 23
Average Power Factor: 150

Temperature: 91°
Barometric Pressure:29

Love using these bullets for 357Mag! Probably will forgo using them in 9mm.

[Bookworm]

I just started working with my new chrono also. Learning a lot, but I cannot shoot for accuracy with the chrono, I'm too concerned with shooting my new toy !

Thanks for the time put into reporting this info. I keep meaning to do the same with some 44Mag info, but it's a lot of typing.
How far from the muzzle was your chrono ?

[iMigraine]

Bookworm,
My chrono was set about ten to twelve feet from my muzzle. Yeah, you should post your 44Mag data on this site to help other casters. I didn't see any chrono data for my cast boolits. Most people seemed to guess how fast their loads traveled but I rather have some solid data for safety.

[NavyVet1959]

I've tried getting that Lee 358-105-SWC to work for the mid-size .38 SuperComp that I'm building, but it will not reliably feed. The 124 gr TC design works a lot better for it though.

[Stilly]

Good stuff!

[OS OK]

Attachment 180935

If you place your target behind the chrono you can see if that load will group at the same time. I get back 10 yards with the chrony about 12 feet in front and have a go at it freestyle like you normally shoot...or go off the benchrest, no biggie. The point for me is to gather as much information as I can off very few rounds as test rounds take longer to make than a production run.
My boolit catcher is a plain plastic trash can full of ground tire mulch for the garden. You can get the lead back too...I'm so cheeseparing with the PB!

charlie

[RedHawk357Mag]

OSOK, what is your sacrificial target backer board? How many impacts before you need to replace? Thanks

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[OS OK]

It's a chunk of 1/2" OSB chipboard stuff, screwed on with 1/2" phillips head sheet metal screws from under the trash can rim...doesn't take long before the center is blown out but if you staple one of these rubber floor pads to it the pad will take staples for the targets and go a long ways.
A neighbor was throwing them out...they are some kind of rubber floor pads about 20-24" square that interlock together like puzzle pieces and about 1/2" thick also. Sorry I don't know what they are called.
It's a great way to keep your hard begged lead. Every time I empty it I get about 8 lbs. of my own boolit metal back...can't beat that huh?

[RedHawk357Mag]

Excellent. Thanks. I have toyed with the concept for awhile. Just haven't been able to convince myself that the backer board would not be the weak link.

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