# of 308 rounds till lands recede

[timelinex]

So I was getting ready to make 500 or so 308 reloads and something crossed my mind. How many rounds of 308 does it take,on average, for A factory barrels lands to recede (let's say .005")?

What about 338lm?

 

[George63]

Re: # of 308 rounds till lands recede

If you check a 308 every 1000 and a 338 every 250 you are at about 1/8 of barrel life for each - that sounds reasonable to me

 

[Broken_Reticle]

Re: # of 308 rounds till lands recede

I would say it depends on what powder you use and how "hot" the loads are. Your barrel material might also play a factor in this number.

 

[timelinex]

Re: # of 308 rounds till lands recede

Just checked my barrel and it's been around 500-1000 rounds. Still around the same as it was, so will check again in 500-1000 rounds. I just didn't want to load 500 rounds and have the last of it shoot bad because it wasn't in the sweet spot anymore.

 

[ChrisGarrett]

Re: # of 308 rounds till lands recede

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: timelinex</div><div class="ubbcode-body">Just checked my barrel and it's been around 500-1000 rounds. Still around the same as it was, so will check again in 500-1000 rounds. I just didn't want to load 500 rounds and have the last of it shoot bad because it wasn't in the sweet spot anymore. </div></div>

I've got an ~8 year old Savage 10FP LE2b .308 with about 3,300 documented rounds down the pipe and depending on my measuring technique at the time and the particular bullets I'm using, I've lost anywhere from .030"-.045", IIRC.

I can't say if things are linear, or exponential, as I wasn't measuring every 500 rounds.

Chris

 

[timelinex]

Re: # of 308 rounds till lands recede

Wow thats a lot, but I guess that is a good amount of rounds as well. Maybe I will seat the next 500 rounds .005" longer

 

[White Mamba]

Re: # of 308 rounds till lands recede

I wouldnt even worry about 500rds, my tacops just turned over 5k rds and can still put them in the same hole seated at maglength

 

[former naval person]

Re: # of 308 rounds till lands recede

It begins to recede with the first round. What you need to determine is at what point that erosion is significant. As the other post say...depends upon too many factors to be definite.

 

[groundhogbuster]

Re: # of 308 rounds till lands recede

Thats why I like 308, and SMK. Jump em.

 

[JayCarver]

Re: # of 308 rounds till lands recede

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: groundhogbuster</div><div class="ubbcode-body"> Thats why I like 308, and SMK. Jump em.</div></div>

What he said +1

 

[leadbullet]

Re: # of 308 rounds till lands recede

first and every shot after that, you are worrying about the wrong stuf though.

 

[KYpatriot]

Re: # of 308 rounds till lands recede

I have a factory 5R that still bugholes with 175SMKs and if I told you the jump you wouldn't believe me.

 

[Deadshot2]

Re: # of 308 rounds till lands recede

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KYpatriot</div><div class="ubbcode-body">I have a factory 5R that still bugholes with 175SMKs and if I told you the jump you wouldn't believe me. </div></div>

Same here. Passed the 4k round count and it still shoots 175gr Nosler Custom Comps great.

My rifle shoots best at magazine length and the last time I checked Jump, I could have measured it with a tape measure

I'm wondering if I ever will have to replace this barrel.

 

[milo 2.0]

Re: # of 308 rounds till lands recede

Actually TL, it takes so long, your knees will be sitting on your balls when you crawl into that gay blue car of your's.

 

[Rooster931]

Re: # of 308 rounds till lands recede

I would buy that jump all day long, the jump in my remington 5R is also extremely rediculous (IMO). I really am not sure how the rifle can shoot so well.
Back to topic, I think the cleaning, ammunition (velocity), twist rate and material of the barrel all come into play here.