What the?!?!

[baboltin]

Are you using used brass ? Check the shoulder of the brass before you assume it’s the bullet hitting the lands

 

[Drewski2324]

Are you using used brass ? Check the shoulder of the brass before you assume it’s the bullet hitting the lands

I'm not sure I understand. To measure the OAL I am using a Hornady oal guage then taking a measurement to the ogive. The dummy round in the pic was a once fired brass resized and seated to confirm what the Hornady gauge was telling me.

 

[baboltin]

I'm not sure I understand. To measure the OAL I am using a Hornady oal guage then taking a measurement to the ogive. The dummy round in the pic was a once fired brass resized and seated to confirm what the Hornady gauge was telling me.

If it’s once fired im sure it’s fine. I don’t know how to explain it other then brass stretches and expands and you just have to make sure the brass is formed correctly when it goes through the resizing process .

 

[Drewski2324]

If it’s once fired im sure it’s fine. I don’t know how to explain it other then brass stretches and expands and you just have to make sure the brass is formed correctly when it goes through the resizing process .

Oh I see. I do not have an case annealer but do trim them if need be.

 

[Aeon]

The Bullet Comparator only tells you how far away the lands are from the bolt face.

to check how much you are bumping the shoulder back you have to measure a fired vs resized case. this should be a very small amount but it should be some. chamber a resized case with out a bullet and a un sized case and report back how each felt

how much jump is to much? The danger is more in not enough jump or jammed into the lands. The closer to the lands the more pressure you build and jammed can really build pressure. Also jammed bullets sometimes will not extract with out the bullet getting stuck in the rifle. Fine for a target rifle but horrible for a hunting rifle where unloading is a common thing.

military rifles are cut for MORE jump because accuracy is secondary to functioning. The most accurate gun on earth is worthless in combat if the bolt will not close on case that is a tad over size or because a bullet got stuck in the lands.

go shoot it and if its grouping is near 1.5" at 100 yards then that is good to go!

 

[baboltin]

Aeon I think explained better but that is something else to consider that I don’t believe you are dealing with at this current time.

 

[Drewski2324]

The Bullet Comparator only tells you how far away the lands are from the bolt face.

to check how much you are bumping the shoulder back you have to measure a fired vs resized case. this should be a very small amount but it should be some. chamber a resized case with out a bullet and a un sized case and report back how each felt

how much jump is to much? The danger is more in not enough jump or jammed into the lands. The closer to the lands the more pressure you build and jammed can really build pressure. Also jammed bullets sometimes will not extract with out the bullet getting stuck in the rifle. Fine for a target rifle but horrible for a hunting rifle where unloading is a common thing.

military rifles are cut for MORE jump because accuracy is secondary to functioning. The most accurate gun on earth is worthless in combat if the bolt will not close on case that is a tad over size or because a bullet got stuck in the lands.

go shoot it and if its grouping is near 1.5" at 100 yards then that is good to go!

Ok I will do that when I get home. So should I just go with the manual's OAL and call it good?

 

[Aeon]

Where do you live? We could figure this out in about 3 minutes

 

[Drewski2324]

Unfortunately im in Ventura.

 

[BBH]

I load 30-06 for M1 and 1903. I have found the headspace gauge (and the Go-NoGo) guages sold by Fulton Armory to be very helpful. Along with the Hornady "chamber all" bullet comparator these tools cover the most important aspects.

See http://www.fulton-armory.com/m1-garand-tools.aspx