When measuring a loaded round to determine jam/jump, I am assuming the Ogive is different on different bullets, even though they may be the same weight. EG a nosler 130RDF, vs. Berger 130 AR-Hybrid?
Ogive Questions
- Thread starter sasquatch98226
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Yep, same weight and diameter does not mean they have the same overall length nor the same length from base to ogive.
If want to get really crazy, measure the ogive on different bullets from the same lot. Youll find that they may vary by .001” or so.
I was having trouble getting the Nosler RDF to group consistently so I took some measurementts. The bullet base to ogive varied up to 0.006" on 10 pieces. I also used the seating stem out of the Redding competition seater since it contacts the bullet in a different place and it varied by 0.007". The variation between thos two measurements didn't track each other. I called Nosler to talk it over and they said a 0.006" variation is normal. My parting words told the guy that Sierra Matchking and Berger bullets had a 0.0015" variation. In other words, Nosler dimensional variation is 4 times more than a good bullet.
I sort all of my bullets from base to ogive, some brands this really helps and some is more of a habit than anything.
The Bergers seem to be the most consistent but certain bullets in the Hornady line are are very precise as well.
The Bergers seem to be the most consistent but certain bullets in the Hornady line are are very precise as well.
If I understand your question correctly... Yes, you will have different measurements for different bullets. The reason is that a comparator measures close to, but not exactly at the ogive of the bullet where it would contact the rifling. Since you are measuring at a different place on the bullet, then the steepness of the angle of the nose of the bullet will affect how far the distance from the measuring point to the actual ogive is, which can then give different measurements for different bullets.
This is what I don’t understand about measuring the ogive of just the bullet when it’s not in the case. I chalk it up there the same as measuring from the base of the shell to the tip of the bullet and we all know that is not the best route. The back end of some bullets are not as true as some would like to think and will be the cause for different lengths when measuring just the bullet.
They vary lot to lot too, sometimes quite a bit... For boat tail bullets you can use a second comparator on the bottom of the caliper to get an idea of the bearing surface of the bullet. One thing I noticed though.. I have to be consistent on which comparator goes on nose of the bullet and which goes on the base. They are slightly different, enough to give different readings.. so I always use one to do my ogive measurements, and the other is strictly for the base.
XLR308 is absolutely right. You can the bullets by; true wight, length, ogive and boat tail. Of course now youre going to have 40 piles of 2-3 identical bullets per box of 100.
From what im reading above, the nosler bullets do not seem like they are very good to begin with.
I personally gave up on loading from the lands becuase all of my rifles have so much jump that the rounds are way beyond magazine length. I now just load to magazine length and when developing, seat the bullet deeper and deeper from there until i find a load i like.
From what im reading above, the nosler bullets do not seem like they are very good to begin with.
I personally gave up on loading from the lands becuase all of my rifles have so much jump that the rounds are way beyond magazine length. I now just load to magazine length and when developing, seat the bullet deeper and deeper from there until i find a load i like.
I have tested sorting by weight and length a couple of ways and just to satisfy my own curiosity to make myself feel more confident that I wasn't wasting time mixed them and tested.
Do a sort of 100 bullets by weight and length and load into your most consistent brass.
But also set aside five or ten bullets of varied weight and bearing surface lengths and load those as a test group.
When you go shoot test those next to your sorted most consistent rounds between 300-600 and you be the judge of whether or not it matters.
Do a sort of 100 bullets by weight and length and load into your most consistent brass.
But also set aside five or ten bullets of varied weight and bearing surface lengths and load those as a test group.
When you go shoot test those next to your sorted most consistent rounds between 300-600 and you be the judge of whether or not it matters.
