SP101 leading issue

Boolit Man Join DateSep 2006Posts79

My Sp101 has leading issues and wondering if you might offer some suggestions what to try. The cylinder throats are all consistent at .357. My bore slugs at .355 , maybe closer to .354, which I consider tight. My boolit is 358156 with gas check, sized to .357. Javlin lube. Load is 6.5gr Unique.

No discernible tights spots in my bore which is smooth. I tried my own poured from WW and also tried commercial boolits which where quite hard (but w/o GC). Brass is 357Mag (not 38spcl). Tried alox as well for lube.

Pretty much run of the mill load and shoots well in my other 357Mag's. I do not have .358 sizer or I would try that but having a hard time believing that would solve the problem.

The leading is heaviest right after the cone. Cone is fine. Leading is consistent even if I vary lube or boolit type. Not horrible terrible leading but much more than I am accustomed to.

Any thoughts?

unique

I believe the load is too light. Eight grains of Unique is a stout load for 158 grain bullets

my new SP101 3" barrel shoots a 358477 sized .358 just fine no leading
i used a upper mid level load of Blue Dot you might try and up your load
a little bit

kids that hunt and fish dont mug old ladies

Boolit Man Join DateSep 2006Posts79

Thank You for suggestions, can't hurt to try...well the 8.0 grs of Unique might.

Does anyone think the .355 bore is tighter than normal?

I never slugged my 2", but I am running my Lee 358-158-RF's through them sized to .358 using Magma hard lube and 4.8~ grains of WW 231 in 38 spec loads.

No issues.

Boolit Mold Join DateFeb 2013LocationMiddle of the MittenPosts1

I have the same gun, I slugged it and discovered that it is a 5 groove. That said, I couldn't get a good measurement. So I
size to the throats and have no leading. My pet practice load with 158 grain commercial cast is 4.5 gr. of Titegroup in
magnum cases.

the tight bore measurement and the leading tells me you have a tight spot under the frame.
the name ruger on the side of the gun tells me you have a tight spot under the frame.
where the leading is tells me you have a tight spot under the frame.
once you fix the tight spot under the frame going to 358 boolits should make the gun a decent shooter.

it's all an educated guess,,,, till the trigger is pulled.

the more i find out about shootin boolits, the more it contradicts everything i ever learned about shooting jaxketed.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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