6ppc bullet seat.

[simon6ppc]

hi guys just a quick question,does the 6ppc round in general like a jump to the lands or not,as ive always believed it likes to kiss the lands,cheers simon..

 

[FergusBailey]

It is something you need to test with each barrel, as that is the only way to definitively know. However having said that, I run >90% of my barrels with the bullet seated well into the lands.

Some top shooters such as Tony Boyer believe that the bullet is more wind sensitive when it is jumped that when it is shot into the lands. A bullet seated into the lands is going to self center in a way that a jumped bullet can not.

So while it is possible to get good results jumping bullets in the 6PPC, and some very good aggs have been shot with jumped bullets, it is fair to say that the majority of 6pps will be jammed.

 

[LCazador]

+1 on what Fergus says, every rifle and every barrel is different, jump or no jump you should be trying both. Also try boat tail and flat base. There is no hard fast rule on bullet seating for any one caliber.

 

[artbosco]

hi guys just a quick question,does the 6ppc round in general like a jump to the lands or not,as ive always believed it likes to kiss the lands,cheers simon..

It has always liked to kiss the lands. So much so that sometimes it leaves a square mark following the kiss. Each barrel will tell you what it likes. Watch the target for its likes and dislikes and how much of a kiss is required.

 

[simon6ppc]

cheers guys,in all fairness the round is so brilliant kissing or not they still shoot brilliant..when you say jammed in the lands how many thou can you jam the bullet in and be safe or does it not matter..

 

[artbosco]

I know a lot of folks who jam until they see pressure signs then back off.

 

[BoydAllen]

When seating into the lands, there are a couple of approaches that are common for designating the bullet's position. One, traditional to short range benchrest, is to find what is referred to as jam, which is the longest length that a bullet may be loaded to, at the neck tension that it will be loaded to fire with, without being pushed back as it is chambered (in that particular barrel, rifle combination). Once this is determined, then tests are performed at chosen seating depths at or shorter than that loaded length. The other approach is to determine at what length the bullet just touches the rifling, and to use that length as the reference for loadings that have the bullet either jumping to land contact, just touching the lands, or seated longer than touching by some designated amount. With both systems, if they are properly done, seating depths are quite specific, to the thousandth of an inch, something that I commonly find missing in internet discussions of such things. Of course, to work up a load, it is best to work with one variable at a time, and then adjust others. Typically, I start with a seating depth that has worked well with the bullet that I am working with, and vary the powder charge systematically looking for best accuracy. Once I have gone as far as I can with that approach, I work with seating depth, in small increments using that charge. I generally seat bullets into the lands, by amounts that vary with the bullet and type of powder.