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It is currently Thu Mar 28, 2024 5:54 pm
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[ 8 posts ] |
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acidfly
Location: Sagamihara, Kanagawa Joined: Fri Dec 21, 2012 Posts: 959
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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?
_________________ You can't comply your way out of tyranny.
Last edited by acidfly on Mon Sep 30, 2019 9:37 pm, edited 1 time in total.
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Mon Sep 30, 2019 9:29 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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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? 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!
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Mon Sep 30, 2019 9:36 pm |
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acidfly
Location: Sagamihara, Kanagawa Joined: Fri Dec 21, 2012 Posts: 959
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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? 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.
_________________ You can't comply your way out of tyranny.
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Mon Sep 30, 2019 9:39 pm |
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acidfly
Location: Sagamihara, Kanagawa Joined: Fri Dec 21, 2012 Posts: 959
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Oh I thought pressure would increase.
_________________ You can't comply your way out of tyranny.
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Mon Sep 30, 2019 9:40 pm |
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lamrith
Site Supporter
Location: Tacoma/Puyallup Joined: Tue May 8, 2012 Posts: 4340
Real Name: Larry
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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=EtLAmANcywIKEEP US POSTED!
_________________Talons wrote: it's too plastic, even for me. it's like old, overworked, plastic everywhere old pornwhore amounts of plastic.
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Tue Oct 01, 2019 6:47 am |
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Duke EB
Site Supporter
Location: maple valley Joined: Mon May 6, 2013 Posts: 2575
Real Name: Earl
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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=EtLAmANcywIKEEP US POSTED! This is correct. Jam definitely causes higher pressure. increasing oal without jam would decrease pressure.
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Tue Oct 01, 2019 10:22 am |
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cruffler
Site Supporter
Location: Bothell Joined: Thu Sep 25, 2014 Posts: 654
Real Name: Tom
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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.
_________________ accumulator of curios & relics
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Tue Oct 01, 2019 2:06 pm |
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hartcreek
Location: Union Gap Joined: Sun Mar 27, 2016 Posts: 1722
Real Name: Randall Knapp
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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.
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Tue Oct 01, 2019 7:48 pm |
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