Newbie has dumb question about c.o.l. on 45 acp


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lezmark
December 11, 2010, 10:23 PM
Ok, i'm confused. All the data I see in the charts show that the col for the 45 acp should not exceed 1.275. If I do that the bullets go way too deep (no, I didnt actullay do it, I could see it wouldnt work). I measured 2 different factory loads and they were 1.481 (Speer Lawman) and 1.494 (Magtech FMC) ????:confused: Can someone please explain to this dummy where he is screwing up?

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Seedtick
December 11, 2010, 11:12 PM
Bad info deleted. :o

Seedtick

:)

Welcome to THR! Make yourself at home.

243winxb
December 11, 2010, 11:15 PM
Try this instead of taking measurements. Seat the bullet a little deeper each time till it fits in your barrel. http://i338.photobucket.com/albums/n420/joe1944usa/45seatingpossibilitiesxn.jpg :)

Mxracer239y
December 11, 2010, 11:26 PM
Start with the obvious first; are your calipers properly zeroed? 1.275 is definitely in the proper range for 45 acp COAL

ranger335v
December 12, 2010, 11:58 AM
"Can someone please explain to this dummy where he is screwing up?"

Doubt you are, as such. All the conflicting lengths are a clue; it varies.

All you need do find is a length that will feed and chamber reliably in YOUR rig.

Ain't no book yet writ that actually knows what your pistol needs for any given bullet, so if a book OAL works it's an accident, not science or engineering.

Walkalong
December 12, 2010, 12:48 PM
As ranger335v posted, I seriously doubt you are "screwing up", since the book is right and all loads for .45 ACP should be 1.275 or less in overall length.

What bullet are you using? I bet someone here loads it and can share the O.A.L. they use with it.

A link to a helpful thread (http://www.thehighroad.org/showthread.php?t=506678) to find the Max O.A.L. your barrel will accept.


Welcome to THR

Jim Watson
December 12, 2010, 12:55 PM
Your measurements are incorrect. Either your caliper is way off or you are reading it wrong. 1.275" is the maximum .45 ACP overall length, not the standard. Most bullets do better seated shorter; a lot shorter in the case of hollowpoints or short-nosed semiwadcutters.

Canuck-IL
December 12, 2010, 01:38 PM
I measured 2 different factory loads and they were 1.481
No, I'd say that qualifies as screwing up ... there isn't any factory 45ACP made at that kind of OAL.
/Bryan

Walkalong
December 12, 2010, 02:09 PM
Yep, that is too short long for standard 230 gr ball ammo. As Jim posted, check your calipers and your readings.

rcmodel
December 12, 2010, 02:44 PM
I measured 2 different factory loads and they were 1.481.That would be 2/10" too long to fit in any .45 ACP magazine, or chamber.

Zero your calipers and start over again.

rc

Walkalong
December 12, 2010, 02:48 PM
Dang rc, I'm gonna have to get my eyes checked.

Yep, 1.481 is too long. :o

Fixed my post.

ArchAngelCD
December 13, 2010, 06:09 AM
Like already said, there's no way a commercial manufacturer will exceed the Max OAL set by SAAMI in factory ammo unless they REALLY SCREWED UP. I'm going to go out on a limb and guess they did not screw up. With an OAL that long the ammo probably won't fit in the magazines let along feed correctly.

I'm sure it's only a mistake in your measurements or your calipers aren't calibrated correctly.

Welcome to the forum...

Trent
December 13, 2010, 11:32 AM
Get a good pair of dial calipers (NOT a cheap electric one from Harbor Freight, I bought one, and it kept going out of calibration), and a 1.5" micrometer to use as a second reference.

Always have two instruments to measure with, and make sure they are calibrated against a KNOWN LENGTH. I'm not talking about a wooden ruler, get an actual precision cut bar used at machine shops for validating measuring instruments.

You are dealing with a process that can potentially KILL you if you do nothing worse than simply screw up the measurements, so go spend a few bucks on good measuring instruments.

ranger335v
December 13, 2010, 12:02 PM
"You are dealing with a process that can potentially KILL you..."

Well, it IS good to know OAL within a certain window of accuracy, but being "off" a bit is really unlikely to get anyone killed so that's an exageration as it's stated.

Witness: Virtually no one had ANY kind of precison calipers prior to maybe the late 70s. Before then we worked out our OAL with simple trials until our ammo fed and chambered reliabily. In fact, few of my generation even bother to look at book OALs today.

Until maybe the late 70s many reloading data sources didn't even have "OAL" suggestions. Those that did never worried about today's sweats over supposed tiny variations for specific bullet brands and versions of the same weight. Very few of us who died young did so because of reloading accidents.


"(NOT a cheap electric one from Harbor Freight, I bought one, and it kept going out of calibration), "

I not only reload but do a little machine work. I have several 6" calipers; a Swiss made professional grade vierner from 1969, two dials and a digital from Harbor Freight Tools from 1996, to as recent as 2005 for the digital. I've had absolutely no problems with accuracy or calibration from any of the Chinese made calipers and the costs were astonishingly low - that's part of why they are so easily available today. Those sold by our various reloading companies, usually at much higher prices, are exactly the same as HFs other than the name tags and some colors.

HF will replace anything they sell if it fails during the warrantee period, I don't see how that can be faulted. Anyone thinking a failure in ANY electronic device is indicitive of the whole brand is wrong. Anyone thinking occasional failures are unusual doesn't understand electronics and is going to be disappointed by them quite often.

Valid reloading warnings can be good but over-stated warnings lose credibilty and become meaningless. ;)

ArchAngelCD
December 13, 2010, 06:47 PM
I agree, nothing wrong with anything I've bought from Harbor Freight.

243winxb
December 13, 2010, 07:32 PM
Lezmark has not returned, long weekend i guess. http://castboolits.gunloads.com/images/smilies/popcorn.gif >Last Activity: December 11, 2010 09:33 PM
Talking to ourselves are we. :uhoh:

Walkalong
December 13, 2010, 09:47 PM
Talking to ourselves are we
Not the first time. ;)

ArchAngelCD
December 14, 2010, 02:29 AM
Talking to ourselves are we.
That's the only way to get the right answers... :p

LightningMan
December 14, 2010, 08:19 AM
I found two different loadings for 9mm using 147 JH/XTP bullets from two different handloading books. One piticular load I was looking for using powerpistol, book 1# max load used 5.1 grs. with COL of 1.100 and the other book with same powder had 5.7 grs. with COL of 1.140. Net difference of .6 of a grain. There could be quite a difference if you used the higher with the shorter COL.

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