how far off lands
- Thread starter bruce1
- Start date
- Status
Certaindeaf
member
When you say "put it in", did you jam it into the rifling? Will that fit in the magazine? If it does not your question is moot unless you want a single shot.
bruce1
Member
it fits in the mag and chambers fine.but it's not no where near the cannular does that matter
dagger dog
Member
No it doesn't ,rule of thumb for seating depth, you want at least .308" bearing surface case to bullet, in other words make sure you have .308" of bullet in the case, not counting a boat tail ,that's one caliber per bullet diameter.
Make sure you don't jam the bullet into the rifiling this can cause high pressure !
Color the bullet with a magic marker, take a fired case from the rifle you are loading for and dent the case mouth enough to hold the colored bullet start the bullet into the case and chamber then extract carefully so the bullet isn't pulled out of the case,
When you look you can see the marks left by the rifiling, look at the case mouth bullet junction and see if the bullet has been pulled out of the case, if it has redo, measure the oal, do it three more times then average the measurements, that is your bullet jam length for that particular bullet, other bullets require you measure jam length for that bullet.
Take 0.020" off that last measurement and load 10 rnds at that length, shoot and see the results , then you can load 10 at 0.015" off, 0.010" and so on.
As mentioned in the previous post the magazine length may dictate if you want follow up shots.
Make sure you don't jam the bullet into the rifiling this can cause high pressure !
Color the bullet with a magic marker, take a fired case from the rifle you are loading for and dent the case mouth enough to hold the colored bullet start the bullet into the case and chamber then extract carefully so the bullet isn't pulled out of the case,
When you look you can see the marks left by the rifiling, look at the case mouth bullet junction and see if the bullet has been pulled out of the case, if it has redo, measure the oal, do it three more times then average the measurements, that is your bullet jam length for that particular bullet, other bullets require you measure jam length for that bullet.
Take 0.020" off that last measurement and load 10 rnds at that length, shoot and see the results , then you can load 10 at 0.015" off, 0.010" and so on.
As mentioned in the previous post the magazine length may dictate if you want follow up shots.
Last edited:
gamestalker
member
Though I agree with the rule of thumb of " bullet diameter of neck contact" as a guide line, but I have had no problems with as little as 1/2 that value in the neck. This is often with the lighter weight bullets that I encounter this decrease in neck to bullet value, but even so, I haven't ever experienced a problem with sufficient neck tension or feeding problems from the magazine, or bullets getting pulled out of the mouth. And if you feel skeptical about neck tension, try as hard as you can to pull a bullet from the mouth using your bare hands. If it pulls out, you have identified the length that doesn't work, then seat a little bit deeper until you've found the holding point.
As for where the canelure is in your pic., my loads look the same and it really isn't at all a concern. The one thing I will warn you of is to make sure that once you've determined the seating depth your going with, start your powder work up from that point, not prior to this, or you'll most likely experience some excessive pressure issues.
GS
As for where the canelure is in your pic., my loads look the same and it really isn't at all a concern. The one thing I will warn you of is to make sure that once you've determined the seating depth your going with, start your powder work up from that point, not prior to this, or you'll most likely experience some excessive pressure issues.
GS
The main reason people load right to the rifling, or even slightly jammed into the rifling, is so pressure will build up quickly and the burn rate will be more consistent. This can make a particular difference in accuracy esp with cast bullets or when you're trying to load a light charge of a too-slow powder. You get a good buildup of pressure, and you take the variation in bullet crimp out of the equation.
If I were loading to the lands in a bolt action, I would not be crimping. That would be sorta redundant.
Last edited:
- Status
