Flat Base 358-359 LSWC 12 br

[Catpop]

Can anyone recommend the above listed boolit in a brand other than Missouri . I am currently using Missouri and I love them, both price and quality, but they all come with a very pronounced bevel base. I am still getting a fair amount of leading in the first 1 inch of the barrel. I want to try a total flat base to see if it will reduce the leading issue.
I'm shooting a 1973 6 5/8" Ruger blackhawk with loads from very light to heavy and a crimped boolit. Throats are sized to .359 and missouri will slip through by hand. I shoot 50 to 100 rounds per week at 25 to 50 yards. Accuracy falls off toward the end of the session.
Any help is appreciated.

 

[ArchAngelCD]

I highly doubt it's the beveled base of the bullet causing the leading. You said the bullet slips right through the throats, I'm guessing that older Ruger needs a wider bullet because it leading stops after the first inch, once the bullet has time to expand enough to seal off the gases. Call Brad at Missouri Bullets, he has unsized bullets he can send you that will probably fix the problem while not losing the bevel that helps with bullet seating. Just a thought...

Try their coated bullets too, they will also probably fix the leading problem without costing more than a few dollars.

 

[ReloaderFred]

Yep, you need to try a larger bullet, one that fits the chamber mouths of the cylinder. You're getting gas blow by and that's causing the leading.

Hope this helps.

Fred

 

[Catpop]

Thanks for suggestions!

My boolits slip through throats with finger pressure, not literally fall through. Sorry if I mislead on that issue. This I have been led to believe is correctly sized to keep boolit from squeezing down before hitting forcing cone/barrel.
Question: Am I wrong on this point?

I will slug bore, maybe today, to see if maybe bore is a little large. Think I already did it and it was ok, but will do it again just to be sure.

Question: Could forcing cone be a problem, it, unlike the barrel, is a real pain to get completely clean.

Again thanks for all the help!

 

[bluetopper]

I don't know of a commercial cast bullet supplier that sells flat, square base bullets. Do you all?
Aren't square base bullets hand casted only?

 

[Jesse Heywood]

I don't know of a commercial cast bullet supplier that sells flat, square base bullets. Do you all?
Aren't square base bullets hand casted only?

Hornady

 

[Catpop]

Did some measuring this pm and found the following:
Throat .3595
Missouri 158 gr 13 br .3595
Barrel slugged .3585
Used same mic for all measurements.
I did take particular notice of effort required to slug. It slid easily for until I reached 1" from the forcing cone and then it required more effort. As someone mentioned, I may have a slight constriction there causing some leading
I'll keep you informed.
NOTE: SUBTRACT .0005 FROM ALL MEASUREMENTS, MIC WAS OFF A TAD.

 

[dbmjr1]

Try BayouBullets.net

Their coated bullets will eliminate any problems with fouling of the bore you might be experiencing.

 

[fireman 9731]

Hornady makes square based swaged lead bullets. I recently tried a box of the 158 grain semi-wadcutters and really liked them.
http://www.hornady.com/store/Lead-Pistol-Bullets

 

[theleo]

Ruger has been known to have issues with thread choke...

 

[Catpop]

Had this pistol since 1973 and never knew I had a problem! Except with the leading issue in the cone throat area.
Now maybe I know why.
So as already stated, bevel base is probably not causing problem and flat base probably is not going to help.
It's not something I have to fix, but it does bother me.
Next step, what should I do? Fire lap?

 

[fireman 9731]

I would try a few different bullet styles, hardness, and lubes before I resulted to fire lapping.

The new powder coated bullets are supposed to be very good at preventing leading. Also, the dry lubed Hornady bullets, and Lee Alox lubed bullets have lube all over the surface of the bullets, not just in a lube groove. That might help too.