AOL bullet

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  • Last Post 07 April 2022
makpeter posted this 04 April 2022

Hey everyone

Until today I have always used the data that is on the data reload sheet.

I shot with someone else's rifle on Sunday and had a much better result there than with my own gun.

Both his and mine are in .223 caliber.

The difference is in the AOL of the bullet.

On the data sheet they mark 2.2598 inch AOL and that is what i do to reload.

With a bullet comparator i measure 2.4133 inch then the bullet touch the landing

How long can I make the bullet without danger?

Can i use an AOL of 2.4015 inch?

Thanks 

Peter

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Tom Acheson posted this 04 April 2022

We see situations where optimum accuracy is obtained with the bullet slightly touching the rifling in the chamber. Yet other gun/load combinations have the bullet maybe 0.010” short of the rifling. I saw this is sod poodle jacketed bullet gun loads of the same cartridge, bullet and powder charge weights. The target tells us which combination to use. Loading manual OAL values are just suggestions. It’s up to us to “learn” what OAL to use.

What is AOL? ____overal length? Approximate?

Tom

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Ken Campbell Iowa posted this 04 April 2022

i always understood the book over-all-length to mean it would fit in a standard magazine ...  for hunting mostly.

i also assumed that fine tuning by seating depth/OAL was to do with finding optimum barrel vibrations, not so much how big a dent in the bullet ogive is best.  

ken

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mashburn posted this 05 April 2022

Ken, You Hit The Nail On the Head Again,

I've often wondered, during the few years that I have observed the forum and reading the " Fouling Shot Magazine, why I have never seeen anything pertaining to harmonics effecting accuracy. I believe that I have heard you mention, at some time in your life, that you participated in .22 RF bench competition. I went the .22 BR route for a while and did I learn a lot on how to tune a rifle to it's optimum accuracy. People in the association were always waiting to see what I, and another gunsmith friend of mine, would show up with at every new meet. You know  what kind of high dollar firearms that show up at these shoots, and my friend and I finished either 3rd. or 4th at every meet, Here is the crazy part, I was shooting a Winchester, Model 69A and he was shooting an old Remington Model 581. You can immagine how ticked off the high dollar boys were to get beat by such firearms. Most people appreciated our gunsmithing talents and thought it was funny.

I've still got some of my old gagets from those days laying around the shop. If people woud spend a little more time with such they would learn a lot.

When I first started building varmint rifle with the same ideas. I soon got tired of tuning and then the next day I would have to do it again, so I started building more simple ,easily maintained accurate varmint rifles. I also learned that no matter how accurate a rifle that you have, if you couldn't learn to dope 40-50 MPH wind speeds it didn't do any good to have a bench rifle.

Two important things that I did learn is, getting each bullet to exit the muzzle at the same point of barrel viberation, I know this next one is something that most of you cast bullet shooters don't believe in, and that is case neck tension. I know it effects jacketed bullets and I think it also effects cast bullets.

Good job Ken.

Mashburn

David a. Cogburn

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Tom Acheson posted this 05 April 2022

David,

I’m one of those CB shooters who believe in the influences of neck tension. I proved it to myself, comparing the match results of 2005 vs. 2006. Same gun, same powder, same primer, same bullet, same cartridge…30 PPC. Increased the neck tension by 0.002” and had much better results in .06 vs. ‘05.

Tom

 

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mashburn posted this 07 April 2022

Hello Tom,

Glad to hear that information. And to my testing, I believe that the higher the velocity, the more effect that case neck tension has on accuracy. I think that the lower velocity of cast bullets probably wouldn't be effected as much, but I believe it effects some. I haven't been shooting cast bullets in rifles long enough to do any elaborate testing. I'm 78 years old, so there is a lot of other projects, that are gathering my attention, at the moment.

Mashburn

David a. Cogburn

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