Case length question

[Emslie]

So I have my once fire brass from my 300wby. I have purchased a modified case from Hornsby to figure out the ogive length but have run into an issue. My once fired brass from the weatherby select ammo is 2.814(habent done and trimming) meanwhile the modified case is 2.820. Will I be running into any issues with this?

 

[spife7980]

Nope, the case length has no bearing on the distance to your lands. Doesnt matter if the bullet is in the case entirely or if only a couple thousandths are, the distance from the bolt face (or belt on this cartridge) to the lands is not effected by what goes on in between. Obviously what goes on in between matters for other things, just not this one measurement.

If you have a print of the reamer that made your barrel refer to that, if not I am including saami specs just for some fyi
The case overall length is 2.825-.012 so a case length from 2.813-2.825 is in spec. When you full length size the brass you will find that it will have grown, likely somewhere in the range of .010 if I were to hazard a guess. That puts it right there above your modified case.

Notice that the chamber is called as 2.844+.012 so it could theoretically take a case up to 2.844-2.856 long but I wouldnt dare go over the specs mentioned above when shooting something as large as that when its just too easy to trim and not blow yourself up.

 

[BurnOut]

You'll likely be alright... the key dimension while the case and projectile are in the barrel is the shoulder-to-ogive dimension. Arguably, the key dimension would be the dimension from the front of the belt on the case to the ogive, but if you set up your resizing die properly, you'll effectively headspace off the shoulder rather than the belt.

Anyhow, once you remove the case/projectile from the barrel, you'll want to check base-to-meplat (bullet tip) and base-to-ogive dimensions.

 

[Emslie]

thanks guys for the explanation, ill use all info passed on.