Gunsmithing 308 Throat Length

[JayCarver]

Hello,

I'm having my 308 re-barreled and I'm just thinking about throat length.

My factory Rem700 barrel had the typical long throat so I mainly shot 175smk's due to there tolerance of jumping to the lands. However I did load up some 185gr and 190 VLD's but needed to seat them out just off the lands for them to shoot good therefor single loading them. I did however like the better performance when shooting out to 1000-1200 yds.

So is it possible to have a throat that would allow the VLD's to be seated to mag length or would the bullet be seated back past the shoulder/neck junction anyways.

If this was possible would the freebore be too short for 175 smk's?

Thanks for your help!!!

 

[JayCarver]

Re: 308 Throat Length

I'm using AICS mags if that matters.

Thanks

 

[seanh]

Re: 308 Throat Length

I'd load a round the length you want, send it with the gun to your smith and then have them cut the throat as necessary

 

[JayCarver]

I plan to make a dummy round I was just wondering what other peoples numbers are.

 

[waste_knot]

Chamber dimensions

Here is what one of my match chambers looks like for Length to Ogive.

 

[JayCarver]

Ok, so I got away from work for a bit to make up some dummy rounds...

I seated the bullets @ 2.800" which leaves 0.085" of room for throat erosion .

I'm going to forget about magazine feeding the 185gr vld's. Seated to mag length the Ogive was inside the case neck! lol

As for the SMK's and Amax the base to ogive was:

175gr SMK = 2.0970"
178gr Amax= 2.0800"

So 17 thou diff, pretty close.

Whats your thoughts? I'm thinking just throat for the SMK's as they don't seem to mind the jump anyways.

Maybe I'm over thinking this WAY too much, idk. I just don't want to have any regrets with this build.

 

[JayCarver]

Thanks waste knot I will have a look at that.

 

[JayCarver]

Here is what one of my match chambers looks like for Length to Ogive.

Do you know what your OAL length was when you got those base to ogive measurements?