I have had trouble finding 338 300 grain smk's and sceners so I ordered 100 hornady 285gr. I measured the BEARING SURFACE alll 100 bullets and they ranged from .529 to .539. About 60 of the rounds were split between .532 & .533 with the remaining 40 split pretty evenly between .529, .530, .531, .534, .535, .536, .537, .538, .539. Is this variance acceptable?
Is this acceptable?
- Thread starter DirtD
- Start date
Re: Is this acceptable?
I accidenlty said lands, i meant bearing surface. Anyways i fixed it. Does anybody measure bearing surface?
I accidenlty said lands, i meant bearing surface. Anyways i fixed it. Does anybody measure bearing surface?
Re: Is this acceptable?
I guess it depends how anal you want to be about it. I have not used that particular projectiles but from the ones that I have used that seems to be about to be about the normal variance in bearing surface length that I have seen. Only you can decide if this variance is acceptable to you but I would not hesitate to use them. I would use the ones with bearing surface length from .535 - .539 for load development or sighters and then use the ones measuring between .0529 - .0534 when shooting for groups. This way you are only looking at about a 1% variance in the bearing surface length between all of the projectiles in a group.
It’s entirely possible to just load up all of the bullets and never be able to tell a difference in the group size but I like the” peace of mind” that comes with sorting my bullets. Good luck in whatever you decide and good shooting.
I guess it depends how anal you want to be about it. I have not used that particular projectiles but from the ones that I have used that seems to be about to be about the normal variance in bearing surface length that I have seen. Only you can decide if this variance is acceptable to you but I would not hesitate to use them. I would use the ones with bearing surface length from .535 - .539 for load development or sighters and then use the ones measuring between .0529 - .0534 when shooting for groups. This way you are only looking at about a 1% variance in the bearing surface length between all of the projectiles in a group.
It’s entirely possible to just load up all of the bullets and never be able to tell a difference in the group size but I like the” peace of mind” that comes with sorting my bullets. Good luck in whatever you decide and good shooting.
Re: Is this acceptable?
Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance .
Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance .
Re: Is this acceptable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DirtD</div><div class="ubbcode-body">Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance . </div></div>
You mean a seating die? I'm sure that's what you mean. I just got a new one with mic, a Forster, and you just rang my bell!!
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DirtD</div><div class="ubbcode-body">Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance . </div></div>
You mean a seating die? I'm sure that's what you mean. I just got a new one with mic, a Forster, and you just rang my bell!!
Re: Is this acceptable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: NoFail</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DirtD</div><div class="ubbcode-body">Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance . </div></div>
You mean a seating die? I'm sure that's what you mean. I just got a new one with mic, a Forster, and you just rang my bell!!
</div></div>
Yup, i am looking at the forster seating die also. How do u like it?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: NoFail</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DirtD</div><div class="ubbcode-body">Thanks for replying. I am thinking a die with a micrometer will make it easy to adjust for the variance . </div></div>
You mean a seating die? I'm sure that's what you mean. I just got a new one with mic, a Forster, and you just rang my bell!!
Yup, i am looking at the forster seating die also. How do u like it?
Re: Is this acceptable?
Please don't be concered with 0.007" (seven thousandths of an inch). Dynamic balance of the bullet is far more important than this minor change in bearing surface. Go shoot them and enjoy.
Please don't be concered with 0.007" (seven thousandths of an inch). Dynamic balance of the bullet is far more important than this minor change in bearing surface. Go shoot them and enjoy.
