.45 acp oal

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Mxracer65

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Can this be caused from an oal that should have been shorter. This was 1.175, later test showed the barrel to require 1.156 (manual calls for minimum oal of 1.155).
 

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Hmm. Guess I will keep trying to figure this out. I went with the lightest load recommend as always.
 
Well, I'd say the longer oal combined with weak neck tension may have caused that...being that the projectile may have been jammed back into the case hitting the feed ramp. The longer OAL could have contributed to that. The bullet being set that far into the case would severely decrease the case volume causing a pressure spike. For 230gn round nose fmj I set my OAL to 1.265
 
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Mxracer65 said:
Hmm. Guess I will keep trying to figure this out. I went with the lightest load recommend as always.
Click to expand...
Could you provide us with more information like bullet, powder and charge so we can provide better replies?

As to bullet set back, measure the OAL before and after feeding the dummy rounds (no powder, no primer) from the magazine and releasing the slide without riding it.
 
After you load the round try pushing the bullet against the table and see if the bullet sets back. Bullet setback is one of the causes of excessive pressure in cartridges.

Mxracer65 said:
Can this be caused from an oal that should have been shorter. This was 1.175, later test showed the barrel to require 1.156 (manual calls for minimum oal of 1.155).
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Why did you decide you needed to load the round to 1.156"? That is very deep. If you were hitting the lands at 1.175" that would raise the pressures for sure. Please explain.

BTW, the min for the 45 ACP is 1.190" so you are extremely short.
 
LiveLife said:
Could you provide us with more information like bullet, powder and charge so we can provide better replies?

As to bullet set back, measure the OAL before and after feeding the dummy rounds (no powder, no primer) from the magazine and releasing the slide without riding it.
Click to expand...
Berry's 200gr hollow point
Titegroup
4.7 gr
 
ArchAngelCD said:
After you load the round try pushing the bullet against the table and see if the bullet sets back. Bullet setback is one of the causes of excessive pressure in cartridges.


Why did you decide you needed to load the round to 1.156"? That is very deep. If you were hitting the lands at 1.175" that would raise the pressures for sure. Please explain.

BTW, the min for the 45 ACP is 1.190" so you are extremely short.
Click to expand...
It was loaded at 1.175. 1.156 I have not loaded just did plunk test to figure out where it needed to be for that barrel (sr1911). My other barrel ( colt 1911) plunk tested at 1.173 for the same bullet.
My book says minimum oal is 1.155.
 
Hodgdon's online data shows 1.155", 4.7-5.2gr
200gr SPR JHP
Titegroup .451" 1.155" 4.7 812 13,700 CUP 5.2 884 16,900 CUP

I believe @Mxracer65 loaded 4.7gr of Titegroup, a Berrys 200gr HP at 1.175", and fired it in an SR1911 where the plunk test indicated it SHOULD have been 1.156".

It's better if you do the plunk test first and determine your maximum COL before you reload and fire anything. If you had the bullet jammed into the lands, and there wasn't any setback, it could have caused the over pressure and blew out the web. Titegroup is extremely unforgiving, you should respect all powders but TG is particularly sensitive.
 
TG has a reputation for being very sensitive to case volume changes. Any setback with TG can easily run you into a unsafe pressure condition. One of the reason I don't recommend it and due to it's high density, taking up very little volume. With TG could easily double or triple charge it and not see the difference in the case.
 
I load to an OAL of 1.26, because that's what my magazines like. But I'm loading 230 gr FMJs with Unique.

I'd imagine setback combined with an already deep seated bullet and a sensitive powder could be an issue.
 
Bullet set back is the most common cause when using Bullseye or other fast burning powders. The neck tension is low. Bullet hits feed ramp, seating the bullet deeper. I avoid Remington brass.
Brand of brass being used? Range brass?

What Walkalong said.
 
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make a dummy cartridge @ your o.a.l., load it in your gun and manually cycle it through the chamber. take another c.o.l. measurement and see if it is smaller. if more than .005", increase bullet/neck tension.

luck,

murf
 
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