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#6012888 - 11/05/15 02:44 PM O-give length
Korean Redneck Offline


Registered: 06/24/09
Posts: 2274
Loc: Houston
This is probably another newbie question...

Is there such a thing as too short of an o-give length? I ask because factory ammo is about 0.020" longer than what I'm getting for my rifle. Is this any sort of a problem to seat it this short? Federal gm match 168 and 175 are about 2.225" and I think my lands about about 2.005-2.007".

More general question, if the factory ammo is longer than the chamber like I think mine is then does that mean I have just been jamming my bullet into the lands?
Just curious.

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#6012895 - 11/05/15 02:46 PM Re: O-give length [Re: Korean Redneck]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2579
Do you have a factory rifle? Or custom?

Most factory rifles have long chambers to accommodate all types of ammo.

If you bullet length is longer than chamber it will get pushed back when chambered. This can increase pressure due to compressed loads

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#6012906 - 11/05/15 02:50 PM Re: O-give length [Re: Korean Redneck]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 14901
Loc: North Texas - God's Country
Man, if your ammo is 20 thousands longer than your chamber, that's a lot. Will the bolt close? Bolt gun? I doubt factory ammo is too long for your chamber. That too long stuff is usually relegated to hand loaders.
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#6012908 - 11/05/15 02:51 PM Re: O-give length [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2274
Loc: Houston
I have a factory savage with an aftermarket shilen barrel. My gunsmith told me held installed it "tight" because he knew what I was trying to do with this rifle.

And since I had the barrel installed, I feel like I've more tight closing rounds than I've experienced with my other bolt rifles, which are all totally factory.


Edited by Korean Redneck (11/05/15 02:53 PM)

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#6012933 - 11/05/15 03:05 PM Re: O-give length [Re: Korean Redneck]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2579
what caliber?

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#6012942 - 11/05/15 03:12 PM Re: O-give length [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2274
Loc: Houston
308

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#6012945 - 11/05/15 03:15 PM Re: O-give length [Re: Korean Redneck]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 14901
Loc: North Texas - God's Country
You have some once fired brass it sounds like. Mic it at the neck and compare that measurement to SAAMI spec. You might need to handload for that gun if it has a tight chamber.
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I have a short attention spa

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#6012961 - 11/05/15 03:25 PM Re: O-give length [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2274
Loc: Houston
Sorry, I should have been more clear. I am attempting to handload for the first time and was taking the sage advice of firemanjg on how to figure out the length of my lands and adjust the ogive seating depth to match. it took me a while to figure out how to do it correctly but I'm fairly certain of my measurement now. That's when I checked some factory ammo and discovered it was shorter.

So given that I have an aftermarket barrel, it is possible to have a scenario where it's shorter than factory by about 0.020"?

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#6012966 - 11/05/15 03:28 PM Re: O-give length [Re: Korean Redneck]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 14901
Loc: North Texas - God's Country
Hey, if you got JG on the job, you don't need my sage wisdom.
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Cast



I have a short attention spa

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#6012970 - 11/05/15 03:30 PM Re: O-give length [Re: Korean Redneck]
Korean Redneck Offline


Registered: 06/24/09
Posts: 2274
Loc: Houston
Haha, I'll take words of experience from anyone. That's actually why I love this forum. Great place just to bounce some ideas off of.
Thanks for the feedback.

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#6012992 - 11/05/15 03:39 PM Re: O-give length [Re: Korean Redneck]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2579
So I had some 175 smk loads and oal is 2.8. That chamber seems really tight

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#6012997 - 11/05/15 03:42 PM Re: O-give length [Re: Korean Redneck]
redchevy Offline
THF Celebrity

Registered: 10/25/04
Posts: 23348
Loc: Texas
Easy test can you put a factory round in it and close the bolt?

Does it leave marks on the bullet?

If not then you are measuring something wrong I would think.
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#6013018 - 11/05/15 03:52 PM Re: O-give length [Re: Korean Redneck]
Judd Online   content


Registered: 01/22/09
Posts: 10747
Loc: Sachse, TX
Yes, that is controled by freebore on the reamer. It could make it hard for you to chamber a round because you're jamming that bullet .220...that is a LONG way to jam one. Once you close the bolt you definitely don't want to open it back up and pull it out because I would bet you will get an action full of powder and a bullet left in the bore. I've had this happen just jamming .020.

If it was me and based upon you telling us you are starting to reload...you can adjust your seater to seat those shells to the 2.005 that you have measured for that gun. Always easier to seat one deeper than it is to seat it longer.

So yes you have a small problem but it sounds like you have the tools to fix it.
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#6013028 - 11/05/15 03:56 PM Re: O-give length [Re: Judd]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
^^What Judd said^^
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#6013047 - 11/05/15 04:03 PM Re: O-give length [Re: Korean Redneck]
IDoc Offline
Light Foot

Registered: 10/13/11
Posts: 19
Loc: West Texas
Be careful of pressures, though. The more you stuff a bullet into the case, the more compressed the load is and the higher the pressures get with otherwise normal powder charges. I have a short throated 6mm that shows excessive pressures with loads a full 2gr under max book.

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