Same components different measurements from Ogive, and OAL

[sasquatch98226]

To make a long story short, my buddy and I have basically the same rifle. 6.5x47 Lapua, 26" barrel, etc etc. He has developed a load as he has had rifle for 6+ months longer than me. I am going to use his base load to development my own that my rifle likes. So we are using the same components, New Lapua 6.5x47 Brass, Berger 130 Grain OTM Hybrid Targets. We have the same Hornady Case head comparator, and bullet comparator tools, but we have a different Bullet Comparator insert. I have the HOrnady Aluminum .264, and he has the Sinclair Stainless Steel 6.5 MM. We are both using the same Mandrel die, and Forster Sizer, and Micrometer die.

The brass has been measured to the same length using the comparator gauge off the shoulder at 1.466
When he measures the bullet seating depth with the sinclair off the ogive, he gets 2.020" and if just using the caliber he gets 2.729"
When I measure with bullet seating depth with the Hornady insert, I get 2.020" off the ogive, but my OAL using just the caliper I get 2.62X"

To me this is telling me the Hornady insert is measuring off a different point on the bullet.

RIght now I am using clean brass no primers, and no powder just to get the dies dialed in. Has anyone else had an issue like this? I am leaning towards just using the same OAL of 2.7269 until I can order the sinclair insert to make sure I am not going crazy.

Any ideas?

 

[spife7980]

What you think it's telling you is correct. Each insert will be machined slightly different with the chamfer and all so that's why it's a comparator: you compare the before to the after. It's also why people refer to their distance from the lands usually and not their actual lengths when relaying reloading info. The comparators will all be an arbitrary number but distance from the lands is a tangible fixed point from which to measure relative to.

Both measure the same piece and find the difference. You could then apply that to all other communications of info but you'll be better off finding your own load unless you're just lucky which isn't unheard of.

Search for the wheeler distance from lands YouTube video

 

[padom]

Everything is good to go. These arent exact measuring devices and dont even measure on the ogive exactly. You use them as a point of reference for your rifle. You and your buddy may have the same parts but every rifle is different. You will want to measure case headspace with once fired brass fired in your rifle and bump back .0015-.002. You will want to measure distance to the lands in your rifle with the 130 Berger. Guessing or using someone elses measurements is a big no no. Measure distance to the lands with the 130 Berger in your rifle and start load development .01 or .02 off to find your node then you can adjust seating depth to see if you can shrink your groups.

 

[Milo 2.5]

Everything is good to go. These arent exact measuring devices and dont even measure on the ogive exactly. You use them as a point of reference for your rifle. You and your buddy may have the same parts but every rifle is different. You will want to measure case headspace with once fired brass fired in your rifle and bump back .0015-.002. You will want to measure distance to the lands in your rifle with the 130 Berger. Guessing or using someone elses measurements is a big no no. Measure distance to the lands with the 130 Berger in your rifle and start load development .01 or .02 off to find your node then you can adjust seating depth to see if you can shrink your groups.

^^^What he says, the diff could be your lot of bullets is different than his, hence diff measurements. I wouldn't go on a shopping spree either, the ss of the Sinclair will wear out faster than the hornady aluminum one, plus it is just a base measurement to develop off of, don't over think this.

 

[sasquatch98226]

So watching the wheeler video it was very clear. However do I need a special tool to remove the ejector pin? I know he recommends removing the ejector, but is that really needed?

 

[spife7980]

What action are you on? For a rem 700 etc its a cake walk, just punch out the retaining cross pin and the ejector will slide out the face of the bolt (but beware, its under spring tension and will rocket out when you remove the punch). For some other actions it can be a bit more of a pain. I just use a nail as my punch and just grind the point flat so no, no special tools necessary.

Watch this at about the 4:10 mark

 

[padom]

So watching the wheeler video it was very clear. However do I need a special tool to remove the ejector pin? I know he recommends removing the ejector, but is that really needed?

What are you trying to do that you want to remove the ejector?? I only do that for Rem700 when checking headspace with a headspace gauge.

Get yourself the Hornady Overall length gauge and the 6.5x47L modified case from Copper Creek to check distance to the lands. You can use this in every rifle you have, just need to purchase modified cases for each caliber.


https://www.amazon.com/Hornady-Overa.../dp/B000PD01SI $34.99

Hornady also makes modified cases for "ALMOST" every caliber. 6.5x47L I had to buy from Copper Creek since Hornady doesnt make one.

http://coppercreekammo.com/product/c...modified-case/ $11.00

 

[sasquatch98226]

Rifle is an MPA with a curtis action.

 

[spife7980]

Rifle is an MPA with a curtis action.

Ive never seen an axiom first person but this image from their website makes it look like a normal rem ejector so you should just be able to push that little pin out and remove it no problem. Might take 15 minutes the first time figuring out how to hold it steady while hammering if you dont have a vice or anything to hold it in but now that Ive done it a few times its literally a minute to strip out. Just set it on the hard edge of my coffee table and tap it out. [IMG2=JSON]{"data-align":"none","data-size":"full","height":"477","width":"356","src":"http:\/\/www.curtiscustom.com\/wp-content\/uploads\/2015\/12\/IMG_0183-720x964.jpg"}[/IMG2]

What are you trying to do that you want to remove the ejector??

Hes trying to find the exact distance to his lands like in the wheeler video as was being discussed instead of an arbitrary jam length.