Another bullet seating position question...

[thefitter]

In a previous tread I was taught that you do not want the bearing surface past the neck shoulder junction.

My next question is how much of the boat tail is it OK to have in the neck?

Thanks

 

[butchlambert]

Really, never heard that.

 

[firearmdoc1]

If you don't have the bullet seated past the shoulded/ neck junction than all of the boattail will be in the neck.

 

[jmd]

I think you're overcomplicating it. Just load to the best length for your rifle.

 

[Uthink Uknow]

A guy older than I told me years ago that the base of the bullet should not extend further into the case than that point where the shoulder angles meet if extended into the neck. So, draw an imaginary line to extend the shoulder into the neck and that's it. I was young and impressionable back then and he struck me as intelligent and learned in matters relating to guns and ammo so I believed him and blindly went through life. He also taught me everything I needed to know about fishing and I haven't starved to death yet. So now you have the definitive word on what the maximum bullet seating depth should be. Remember, I learned this when I was about 16 years old and knew everything.

 

[TimP]

Have you tried testing bullet seating depths in your rifle to determine what is most accurate for your rifle. Ideally not seating your bullet bearing surface beyond the neck shoulder junction is best for a couple of reasons case capacity and the dreaded doughnut. But depending on your freebore and the length of the bearing surface of the bullet you are using it is not always possible. If you are ordering a new reamer you can dictate the amount of freebore you want if it is a barrel that has already been chambered you will have to work with what you have. Don't be stuck on I can't seat my bullet beyond the neck/shoulder junction.

 

[thefitter]

Sorry I did not clarify this in the OP, I'm designing a reamer for one specific bullet.

Thanks

 

[TimP]

Back to your original question. If the cartridge you are working with has a long neck you can keep the boat tail in the neck. I have a custom reamer for my .243 Win set up for DTAC 115 gn bullets. With the short neck on the .243 Win the boat tail is below the neck shoulder junction. If your set up is for a magazine fed rifle make sure you know what the longest over all length the magazine will accept.

 

[its only light]

There is an article on this site about a 284 tactical hunter where he states that when a 162gr amax is loaded to mag length the ogive is actually slightly below the neck but yields acceptable accuracy. If I was having a reamer made I wouldn't do it that way, but it will work. I'd be inclined to keep the bullet just above the neck shoulder junction. This should be doable depending on your neck length.

Is this for your short barrel 7mm saum you were asking about awhile back?

 

[thefitter]

...

Is this for your short barrel 7mm saum you were asking about awhile back?

Yes it is. The other thread yielded some good info, particularly the last post by dmoran.

http://forum.accurateshooter.com/index.php?topic=3807707.msg36188279#msg36188279

 

[its only light]

Awesome I'm glad you are going through with it, I'm kinda keeping an eye out for updates.