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Rex
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Posted: March 12 2017 at 12:15pm | IP Logged Quote Rex

I read a lot about sizing cast a .oo1 over cylinder throat size. To my way of thinking the throat is the final sizing die ahead of the forcing cone so is there any reason at all to size more than the cylinder throats?
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Ham Gunner
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Posted: March 12 2017 at 2:35pm | IP Logged Quote Ham Gunner

Rex, I would think that the charge will obturate the cylinder throat with it's jack hammer blow to the lead bullet so any further sizing would just cause more pressure and possible lead build up on the throat surface.

I have always read that the proper fitting bullet should only need a slight bit of finger pressure to cause it to pass through the cylinder throat and assumed that an almost gas proof seal would be accomplished before the bullet exited the throat.

However, I have read where many do not even size their bullets and are happy as long as they will not easily pass through the throats by hand. They are happy with their results as well, so I think we can easily over think the throat issue sometimes.

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JD45
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Posted: March 12 2017 at 5:40pm | IP Logged Quote JD45

You are correct. And why does Ruger insist on squeezing the hell out of .45 bullets before they hit the barrel?
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Buffalogun
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Posted: March 13 2017 at 6:01pm | IP Logged Quote Buffalogun

Rex,

I think it really comes down to what works and what doesn't. Trial and error is the only way to know.

Most authorities have stated sizing a bullet down more than .002" will distort it and accuracy goes down the drain.

If the bullets are sized less than throat diameter, there is gas leakage down the sides of the bullets unless they are soft enough to obturate. A hard bullet sized smaller than throat diam. may not obturate and will cause leading.

I like to use a cast bullet that drops a little larger than throat diam. and let the throat do the sizing. Provided the throats match up well with the groove diam. of the barrel.

I have a Lyman lubrisizer, but find it easier to use LEE's sizing dies, if for no other reason than to just put on gas checks.


JD.....Ruger is probably rolling in high cotton! I think they probably sell every revolver they make. Most people who buy handguns shoot them very little and probably think they are lousy shots. They probably don't suspect the gun has problems.

Mike

Edited by Buffalogun on March 13 2017 at 6:04pm


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noylj
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Posted: March 21 2017 at 12:50am | IP Logged Quote noylj

NO, the "rule" is that the bullet needs to at least a snug slip fit in the
cylinder's throats and at least 0.001" larger than the actual barrel groove
diameter.
If the throats are smaller than the groove diameter, you'll have to get the
throats opened up.
I found back about 1974 that unsized bullets were more accurate in my
Browning HP, Colt 1911, .38 Spl, .357 Mag, and .44 Rem Mag.
I ordered bullet size dies that were either nominal bullet size as-cast or
0.001" larger, as all I had was a Lubri-sizer to apply the lube. Then I went to
pan lubing and then tumble lubing.
If you shoot an alloy less that 15 BHN, you can usually use a bullet that is
0.001" larger than actual bullet groove diameter and if you are using a 15-22
BHN alloy, you will usually do better with 0.002" over actual groove diameter.
Personally, I recommend you try as-cast, tumble lube in LLA or 45/45/10
from White Labs and see how they work.
If you have to size (and I can't imagine having to after more than 40 years of
NOT sizing), get a pass-through sizer like Lee or Star.
For me, sizing is so '60s...

Edited by noylj on March 21 2017 at 12:54am


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joed
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Posted: March 22 2017 at 6:24pm | IP Logged Quote joed

I was taught that a lead bullet should need a gentle push to come
out the throat.   That has held true in all my guns.   I was told that
this is one of the biggest things to obtaining accuracy from a lead
bullet.

The only gun I ever owned that was horrible was a S&W Mtn gun in
.45 Colt.   Never could figure that one out, it was a shotgun.

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Reloader06
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Posted: March 23 2017 at 7:11pm | IP Logged Quote Reloader06

Noylj nailed it.

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mikld
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Posted: March 24 2017 at 2:07pm | IP Logged Quote mikld

I don't like "push through", "drop through", "snug fit", "slip fit",
etc. mainly because they are subjective and not real
measurements. It's no big deal to measure the cylinder throats
and size the bullets to the same diameter, using real tools
giving real, factual measurements. In my experience this works
quite well and anything larger than throat diameter is swaged as
it passes through the throat and most of the time sprays lead on
the cylinder face, frame and forcing cone.

Edited by mikld on March 24 2017 at 2:09pm


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