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S&W Shield 40 Leading/Tumbling Issues
I've ran into a road block when casting and loading for my S&W Shield 40. Seems like no matter what I do the barrel leads like crazy after 5-10 shots and half the boolits are tumbling at 7yds. My mould is the Lee TL 401-175, they are coming out .401-.403 in and 176-178gr, my estimated BH is 10 (cast one pure lead boolit and one alloy boolit and sandwiched a BB in between them, measured each dimple and did the math). I have tried LAA lube loaded as cast and sized .401. Also tried powder coating as cast, sized then PC, PC then sized .401. Slugged the bore with pure lead and it came out .4015. Using Lee push through .401 sizer, Lee Loadmaster, Lee Carbide Dies, no crimp, no FCD, OAL 1.125". Using Hodgdon Universal Powder, I've tried from 4.0gr (800fps, actual) to 5.2 gr (970 fps, actual). I have only had one chambering issue, boolit bulged the case to much.
I haven't had this problem with my LCP 380, PPQ 9mm, or Springfield 1911 45acp...they all shoot PC & LLA cast very well.
This was a clean shiny barrel and after 10 PC boolits it looks like this. In one pic you can see the leading start very soon after the throat.
S&W Shield 40 Leading/Tumbling Issues
Quote:
Originally Posted by
JBinMN
I mentioned that earlier & pulled the post. I also posted up 2 links to help with determining how leading is being caused. It seems that the OP did not want to entertain the thought of his having a boolit that was large enough "as cast" to start with at .402 -.403, & then sizing it even smaller(.401) than his slugged bbl.(.4015) would likely cause leading, PC or lubed either way.
So, perhaps the OP will pay attention now that you mentioned it again.
;)
Maybe the colored boolits in the other post & offer to get some, was distracting...
;)
Here is that earlier deleted post if anyone cares now...:
--------------------------------
These links should be helpful, if you care to go look:
http://www.lasc.us/TaylorLeadingDefined.htm
http://www.lasc.us/Fryxell_Book_Chapter_7_Leading.htm
I would agree with boolits likely being undersized. If your bbl. slugged at .4015, then IMO, you should be trying to run your boolits at .4025-.403., meaning 0.001" over groove diameter(.4015)
With the undersized boolit, "gas cutting" becomes an issue & that will run the streaks up the bbl to the muzzle, as well as erode what lube or PC you have on the boolit.
Additionally... If it is a newer bbl. there could also be some stripping of your PC or lube by the rifling as well, particularly when the boolits are undersized.
Anyway, I hope ya figure things out & work out the issues.
:)
G'Luck!
I am entertaining the idea and I have been reading through the link you sent me. I have run them as cast TL and PC with same results.
S&W Shield 40 Leading/Tumbling Issues
Bullet puller arrived at lunch pulled a few bullets all of them the bottom 1/3 of the bullet was sized down to .398".
Casted a few testers at lunch and following advice from a PM. Where they suggested to check the roundness of the bullet. If I rotate the bullet and measure diameter I get anywhere from .400 to .4025 in width. I think I need a shorter bullet and a new mold.
Cwlongshot is sending me of if his 145gr to try.