Is There Consensus on Minimum Amount of Neck/Bullet Contact

South Pender

South Pender

CGN frequent flyer
Rating - 100%
75   0   0
Location
Vancouver
Thought I'd throw this out to you experts on this forum. Is there an agreed-upon opinion about the minimum distance that the bullet should protrude down into the case neck? I ask because I've discovered that the new-to-me 6 PPC I'm loading for seems to have a long throat, and to seat the bullets I want to use so that they touch the lands (68-gr. Bart's and 68-gr. Watsons) puts the bullets out so far as to give me less-than-usual bullet/neck contact (less than half the length of the neck). Of course, I could seat them deeper, but this would introduce a certain amount of jump, which I'd like to avoid if possible.

Any insights on this?
 
Usually a caliber of depth into the neck.
Surprisingly, deeper is quite often better for concentricity and consistent neck tension. Unless you are eating up needed case capacity
I would rather a gun shoot best with the bullet no where near the lands. Ymmv.
 
It depends on the application. For hunting rounds that will be cycled through a magazine, and that might see rough handling, I like more bullet in the neck, but for target rounds fired out of a single shot, I sometimes go with much less bullet in the neck. I have run as little as .125" in some of my 17 and 20 caliber varmint loads for my single shot rifles.
 
first hand knowledge of the PPC.........

The Ogive of both the Barts and Watson bullets will put the bullet right at the end of the neck, the same bullet weight in a Berger bullet will put the base down the neck almost half way....

It doesn't matter.......I run Barts 68's in formed Lapau 220 russian brass and I swear the bullet is only in the neck by 15-20 thou, I set them by hand with a wilson inline seater, the targets tell me I am onto something because that barrel shoots in the 1's pretty damn consistently when I do my part and the wind agrees with my decisions, again your asking on the wrong forum and you need to go back over to the canadian benchrest forum to get the right answers for what your trying to achieve, practical and precision rifle shooting in this forum is just not the game we're playing and therefore the answers you get here are not going to be the answers that pertain to your sport, albeit they will be correct answers if your banging steel plates against a stop watch......apples to oranges........
 
Well, let me give you a few more details. I'm not into competitive BR shooting--just interested in getting sporters to shoot something like BR rigs. The rifle is a Sako A1 repeater, and with the Bart's touching the lands, the base of the bullet is .121" down the neck. The Watson ends up about .140" down the neck. I don't plan to work rounds through the magazine, so getting the OAL to work through the mag is unnecessary. I'm using Wilson dies too--the chamber-type neck sizer and chamber in-line seater.
 
your good to go, if your neck sizing with an appropriate sized bushing and your seater plug is a good fit to the bullet you should have virtually no run out of your loaded ammo and enough neck tension to hold the bullet in perfect alignment, .120 is still lots of bullet in the case. I am going to guess that your factory barrels have got either a 1 in 12 or a 1 in 14 twist and you'll have exceptional results with the sierra 70 grain match king in both rifles, that bullet being of a longer design will put the base of the bullet closer to the neck/shoulder junction as well
 
You must log in or register to reply here.
Back
Top Bottom