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 OAL?? 
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Location: Sagamihara, Kanagawa
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To start off I have a Remington. 308. My current load works very well, but I can't leave well enough alone and want to try and improve. My OAL is 2.795"-2.800". I know Remington has a long throat so trying to get to the rifling of out of the question. Measuring my mags I feel very comfortable taking the OAL to 2.870". I'll work up in. 020" incriments, but the question is aside from an increase of velocity will there be an adverse effect or positive effect on accuracy?

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Last edited by acidfly on Mon Sep 30, 2019 9:37 pm, edited 1 time in total.



Mon Sep 30, 2019 9:29 pm
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acidfly wrote:
My OAL is 7.095"-8.000".


Is that a, ahhh, personal measurement? Or are you shooting a cannon? :ROFLMAO:

As you increase OAL, you should see a decrease -- not increase -- in velocity. This is because the pressure in the cartridge will drop as the volume inside the cartridge increases.

As for accuracy, in theory you'll see an increase as the bullet gets closer to the lands. But . . . let us know the results!

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Mon Sep 30, 2019 9:36 pm
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MadPick wrote:
acidfly wrote:
My OAL is 7.095"-8.000".


Is that a, ahhh, personal measurement? Or are you shooting a cannon? :ROFLMAO:

As you increase OAL, you should see a decrease -- not increase -- in velocity. This is because the pressure in the cartridge will drop as the volume inside the cartridge increases.

As for accuracy, in theory you'll see an increase as the bullet gets closer to the lands. But . . . let us know the results!



That's a laying in bed tired but thinking about things to much moment. My wife was getting mad because I kept getting in and out of bed to test different OAL bullets in my mags lol.

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Mon Sep 30, 2019 9:39 pm
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Location: Sagamihara, Kanagawa
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Oh I thought pressure would increase.

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Mon Sep 30, 2019 9:40 pm
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Lots of things factor into pressure, I am relatively new at this myself.
I think if you jam the bullet into the lands it "can" cause higher pressure as the bullet cannot get moving before hitting the rifling? So it causes an initial spike to get the bullet moving?

That said I have heard there is usually a sweet spot in the jump to lands measurement where accuracy reaches it's optimum.
This might be worth a read if you are going to run down the jump to lands rabbithole. There are ways to get your distance to lands with FIY tools, but if I get into that I plan to buy the Hornady tools. I already have the comparator, just ned to add the parts to measure the chamber.
https://bergerbullets.com/setting-loads ... -accuracy/
also:
https://www.youtube.com/watch?v=EtLAmANcywI


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Tue Oct 01, 2019 6:47 am
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lamrith wrote:
Lots of things factor into pressure, I am relatively new at this myself.
I think if you jam the bullet into the lands it "can" cause higher pressure as the bullet cannot get moving before hitting the rifling? So it causes an initial spike to get the bullet moving?

That said I have heard there is usually a sweet spot in the jump to lands measurement where accuracy reaches it's optimum.
This might be worth a read if you are going to run down the jump to lands rabbithole. There are ways to get your distance to lands with FIY tools, but if I get into that I plan to buy the Hornady tools. I already have the comparator, just ned to add the parts to measure the chamber.
https://bergerbullets.com/setting-loads ... -accuracy/
also:
https://www.youtube.com/watch?v=EtLAmANcywI


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This is correct. Jam definitely causes higher pressure. increasing oal without jam would decrease pressure.


Tue Oct 01, 2019 10:22 am
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acidfly wrote:
To start off I have a Remington. 308. My current load works very well, but I can't leave well enough alone and want to try and improve. My OAL is 2.795"-2.800". I know Remington has a long throat so trying to get to the rifling of out of the question. Measuring my mags I feel very comfortable taking the OAL to 2.870". I'll work up in. 020" incriments, but the question is aside from an increase of velocity will there be an adverse effect or positive effect on accuracy?


You won't know this until you try. I've always just squeezed the neck of an empty case a bit, inserted a bullet, and chambered the round. This will give you a quick and easy way to find the maximum OAL.

I just turned the bullet seater in maybe half a turn after setting it to the max OAL and loaded a few rounds.

I don't know what kind of bullets you're using, but if the bullet won't fully seat at the rifles's OAL, try a heavier bullet with a flat base instead of a boattail.

If your resulting rounds are too long to fit in the mag, then you'll have to compromise with the max length that will fit in the mag or just load them one at a time.

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Tue Oct 01, 2019 2:06 pm
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There is a problem with what you are doing. Unless you are using match grade bullets the ogive will very from bullet to bullet and from lot to lot so if you change to a different brand bullet even the same weight you have to do the steps all over again which is why I load to a node so I can substitute components and get the same accuracy.


Tue Oct 01, 2019 7:48 pm
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