308 throat erosion

[Warren Dean]

I have never experienced throat loss of 0.001 per 100 as some have claimed here. I meash-sured freebore today out of curiosity after shooting 450 rounds at nationals a couple weeks ago. Zero loss. Used the same 2 bullets as last measurement plus a few new ones from the same lot. Shooting 200 Hybrids @2650, Bartlein HV 5r 10 twist. This barrel has 1124 rounds through it and it still measures the same as it did the day I chambered it. Maybe I'm lucky, maybe it's the "Bore Rider" throater.

Same sort of experience here. .... It's the Russians!!!

 

[DirtySteve]

Am I the only guy that keeps the bullet I use to measure with the Stoney Point/Hornaday gauge with my modified case.? So I use the same bullet all the time to measure.

 

[Dgd6mm]

Am I the only guy that keeps the bullet I use to measure with the Stoney Point/Hornaday gauge with my modified case.? So I use the same bullet all the time to measure.

No.

 

[Jdne5b]

Am I the only guy that keeps the bullet I use to measure with the Stoney Point/Hornaday gauge with my modified case.? So I use the same bullet all the time to measure.

I do the same until that lot of bullets is gone. Then it gets shot and replaced with one from the next lot.

 

[rammac]

Not true. With a .200+ freebore the OP is shooting about the same loads and velocity that 99.9% of F-TR competitors shoot with no pressure issues. I regularly run 200 gr. bullets @ 2650 + fps with little or no throat erosion over the 2500 - 3000 round life of a barrel.

First of all most competition shooters push their loads well over SAAMI max without even knowing it, that's a fact.

If you believe that that load is under SAAMI max then show me the proof, and I don't mean a picture of a cartridge case, most brass cases don't even show pressure signs until the chamber pressure is up around 65,000 to 70,000 PSI and if you have a tight chamber and bolt then the pressures will be even higher before the brass starts to move. I would want to see the results of a 10 shot string using a pressure transducer.

 

[Jdne5b]

First of all most competition shooters push their loads well over SAAMI max without even knowing it, that's a fact.

If you believe that that load is under SAAMI max then show me the proof, and I don't mean a picture of a cartridge case, most brass cases don't even show pressure signs until the chamber pressure is up around 65,000 to 70,000 PSI and if you have a tight chamber and bolt then the pressures will be even higher before the brass starts to move. I would want to see the results of a 10 shot string using a pressure transducer.

Maybe you should prove that it is over pressure?

 

[Medic505]

would want to see the results of a 10 shot string using a pressure transducer

Next time I go shoot I'll call The Guffster and borrow his pressure transducer.

 

[pcmacd]

For you F-TR guys:
I have a 308 Bartlein barrel with 788 rounds down the tube. Reamer used had .202 freebore.
600 of the 788 rounds were 200.20x Bergers with .010 jump and 44.2 grains of Varget. The other 188 were experiments with Warner Flatline 180s with 43.2 grains of H4895.

I just check and the barrel throat erosion is equal to .015 since the 1st shot. Is this typical for a 308?

.... and?

 

[Oleg S]

I have never experienced throat loss of 0.001 per 100 as some have claimed here. I meash-sured freebore today out of curiosity after shooting 450 rounds at nationals a couple weeks ago. Zero loss. Used the same 2 bullets as last measurement plus a few new ones from the same lot. Shooting 200 Hybrids @2650, Bartlein HV 5r 10 twist. This barrel has 1124 rounds through it and it still measures the same as it did the day I chambered it. Maybe I'm lucky, maybe it's the "Bore Rider" throater.

Same here with my .308 barrels.