bullet jump ?

[gusman]

Will each type of bullet desire the same amount of jump
From the same rifle or will this stay fairly consistent
between say between a max and bthp ?
I have 68gr hornady bthp shooting 1/2" groups,
I was going to load some 69gr smk and was not sure
if I still needed to play with that part of the equation??

[Artos]

Yeah...your ogive changes with a bullet swap most of the time. If your gun is picky with engagement, you may have to tweak.

[Cajun Blake]

All bullets shoot differently and have a sweet spot when reloading

I'd start with kissing the lands and shoot a 5 shot group, then adjust seating depth until desired accuracy achieved

[Bowyer]

What is "smk"?

[LWD]

SMK is Sierra Match King.

As a general rule, I agree with Cajun Blake. However, since the 68 grain Hornady and the 69 grain Sierra are very similar bullets and the Hornady is working well for you, I'd start with loading the Sierras to the same COAL as the Hornadys unless that would put them into the lands. You can always adjust from there.

Remember, changing multiple variables at once makes finding a great load pretty tough. Tinkering with COAL is one of the last things I do unless I'm working with Barnes Triple Shocks, which can be especially sensitive to seating depth.

LWD

[elkaholic9292]

SMK is Sierra Match King.

As a general rule, I agree with Cajun Blake. However, since the 68 grain Hornady and the 69 grain Sierra are very similar bullets and the Hornady is working well for you, I'd start with loading the Sierras to the same COAL as the Hornadys unless that would put them into the lands. You can always adjust from there.

Remember, changing multiple variables at once makes finding a great load pretty tough. Tinkering with COAL is one of the last things I do unless I'm working with Barnes Triple Shocks, which can be especially sensitive to seating depth.

LWD

I agree with everything here except measuring the COAL. I would start by seating to the same depth as what is already working, but as Artos pointed out, I would measure to the ogive, not the point. In theory, you could have two bullets of the same COAL, one kissing the lands, and one with quite a jump.

[Creedmore]

I agree with everything here except measuring the COAL. I would start by seating to the same depth as what is already working, but as Artos pointed out, I would measure to the ogive, not the point. In theory, you could have two bullets of the same COAL, one kissing the lands, and one with quite a jump.

x2 !

Get you a Hornady or Sinclair bullet comparator and inserts, and use your caliper to measure ogive and adjust jump.

[Cajun Blake]

x2 !

Get you a Hornady or Sinclair bullet comparator and inserts, and use your caliper to measure ogive and adjust jump.

..... and take lots of notes

[gusman]

Agreed, I have all that is shown in the pic...
should have said measuring with bullet compater. ..sorry about that..

[gusman]

And the fun starts again, hopefully tomorrow I can get these through paper
thanks for the advice. ..

[LWolken]

I usually load 3 kissing, then 3 each +5, +10 then -5, -10, -15 from their I can get a pretty good idea.

[Wilfong9]

What do you guys use/do to make sure you are in fact touching the lands and not seated into or slightly off?? I'm running into this issue right now. I've tried the Dalrod trick and don't consider it accurate enough. I've tried marking the bullet with a sharpie and chambering it but don't think the ink comes of evenly when kissed against the lands.. Just want to make sure I'm not unknowingly increasing the pressure

[elkaholic9292]

^^ with the sharpie method, did you open and shut the bolt several times before removing bullet? When I do this, the ring is pretty well defined.

[Wilfong9]

I have tried that..just hard to tell as it starts getting close if it's touching or being pressed into the groves. Do you guys that use the hornady tools for this feel confident they are precise enough?

[Bowyer]

I have tried that..just hard to tell as it starts getting close if it's touching or being pressed into the groves. Do you guys that use the hornady tools for this feel confident they are precise enough?

Without putting a scope down the barrel to see when the bullet touches, you are going to have to develop a sense of feel with whatever tools you use.
I measured with my Hornady length gauge about 15 times before getting consistent measurements. Like everything else it takes practice.