my 627's (357 mag) and my 929 (9mm) barrels both measure at .357 diameter. Would it be best to get a .358 or .359 diameter molds?
my 627's (357 mag) and my 929 (9mm) barrels both measure at .357 diameter. Would it be best to get a .358 or .359 diameter molds?
What size is a snug push through your cylinder ?
my guns like .358
For cast I like .359" but not hard alloy! Maybe COWW or COWW and Pure.
Fat bullets have always shot better for me
" Associate with men of good quality, if you esteem your own reputation: for it is better to be alone than in bad company. " George Washington
359 is best, if it chambers.
~~~~~~~~~~~~~~
“If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.”
― The Dalai Lama, Seattle Times, May 2001
Micrometer cannot measure small round holes because the knife edges bridge across the radius and give a smaller number. Best to use gage pins, expandable ball mic or drive soft, pure lead ball through cylinder throats and measure. That being said the great majority of modern S&W revolvers will pin .3585-.3588 and either a,.358 or .359 bullet will be accurate. Ideal fit is to be able to push bullet through throats by hand pressure only with slight felt resistance.
The ENEMY is listening.
HE wants to know what YOU know.
Keep it to yourself.
So get a .359 mold and a .358 size die and you are set.
Wayne the Shrink
There is no 'right' that requires me to work for you or you to work for me!
^^^^^^^This.
The cylinder throats determine the size the boolits need to be unless they are smaller than the groove diameter of the barrel. In that case, the throats need to be reamed to the proper size.
Outpost is also correct about the normal size for S&W 38/357 cylinder throats.
Your 929 is a different animal. I have one. Mine has a groove diameter of .355 which is nominal for 9mm. The cylinder throats measure .357 on mine. I run .357 boolits in it and it works fine. The chambers will accept larger boolits but it isn't necessary because the throats will size the boolits down anyway. Accuracy was not improved by larger diameter.
I normally size most of my 38 cal boolits at .357. I am not a good enough shot to make use of any accuracy improvement from a larger boolit. Mine may be bumping up to throat size anyway.
I have no issues with leading with any of the boolits I shoot in multiple revolvers. I lube with White Label NRA 50-50 using a Lyman lubrisizer.
It is a rare cylinder indeed that will take a .3585" gage pin in my experience .357" in a S&W is almost always a go where .358" is normally a no go. Not saying this for the sake of argument, but hundreds of S&W cylinders measured and reamed or honed over the years. If they were already .358" I wouldn't have been resizing them for years.
If you can get a .358" to chamber, this would be the most popular size for 38/357 revolvers. If you cannot chamber a .358" I would have the cylinder throats honed so that you can.
Got a .22 .30 .32 .357 .38 .40 .41 .44 .45 .480 or .500 S&W cylinder that needs throats honed? 9mm, 10mm/40S&W, 45 ACP pistol barrel that won't "plunk" your handloads? 480 Ruger or 475 Linebaugh cylinder that needs the "step" reamed to 6° 30min chamfer? Click here to send me a PM You can also find me on Facebook Click Here.
In support of this, I own a couple of revolvers that measure less than .357 in the cylinder throats. In my case, the groove diameter is small enough that it isn't an issue.
Throats at .356 with groove diameter at .355 works fine.
All the dimensions need to form a funnel going forward. If this is the case, no work is needed and nearly any normal diameter boolit will work.
As an example, I own a Model 60 S&W. Early model in 38 Special. Chambers will accept boolits up to .359 but the throats are .3565(I pushed a lead ball through the cylinder and measured it with a micrometer). Groove diameter is .355 or slightly less. Slugs from the barrel fall through the cylinder easily.
Last edited by tazman; 12-28-2020 at 11:36 AM.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
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