308 bullets too short

[1jonathan1994]

I've been using speer 125 tnt on 308 ar10 for a while and like it. Just loading to 2.7 coal.
Turns out I can drop a bullet in the chamber and put an empty brass behind it, close the bolt, and the bullet rattles around.
What is the bad of this. I'm guessing gas and powder blow by the bullet before it reaches the throat.
18" jp and 2A arms barrels.
43 gr xterminator is 2700fps for 3 gun load.
47.7 gr H4895 is 3050 fps for critters. Can go about 3150 before pressure signs with the gas cut off in 70f weather.

When I tried 178 eldx I couldn't even reach book max and factory ammo showed pressure signs.

 

[Halfnutz]

Loaded 125s in 300wm with RL19 no where near the lands, prairie dogs didn't like it.
I'd try 155s or 168s but if 125s work for your application, then they work.

 

[918v]

Maybe you’re over gassed if factory ammo shows pressure signs.

As far as 125’s being too short, whether it’s bad or not in terms of gas blow by depends on the accuracy. If it is satisfactory then don’t worry bout it.

 

[Halfnutz]

What pressure signs?
I have a Rem 700 .308 that has primer flow with factory ammo, the firing pin hole is sloppy and makes it resemble a pressure issue.
More than one thread about primer flow with non high pressure bolts in large frame AR's on here.

A good article about pressure signs-

Understanding Pressure :: Primal Rights, Inc

Reading pressure is a required skill that all shooters must have. Whether you are shooting factory ammunition or your own handloads, you absolutely must be able to detect and interpret pressure signs on your fired brass.

www.primalrights.com

 

[Cosmic338]

125s seem short for an AR10 platform

 

[x2cross]

have a Rem 700 .308 that has primer flow with factory ammo, the firing pin hole is sloppy and makes it resemble a pressure issue.
More than one thread about primer flow with non high pressure bolts in large frame

My "high-pressure" bolt from Toolcraft was very sloppy on the tolerances and would crater/pierce primers from factory ammo. Switched to a JP bolt, and the problem disappeared. Mine's a 6.5 creed, but the principle is the same

 

[1jonathan1994]

OP here
The 125s are better than 2 inch groups at 100 yds in mixed brass and full progressive loading.
Close to 1 inch with good brass and electric powder trickler.
I'm satisfied.

JP bolt and Hornaday 178eldx ammo had primer flow and stiff charging handle pull in 95 to 100F temps..with the gas turned off. Not overgassed.
Ar10 with the gas off will be nearly impossible to pull the charging handle if too much pressure

I'm guessing that the long jump and possibly gas blowing by the 125 gr bullets let me load way above book max with no pressure problems.

 

[Halfnutz]

125s seem short for an AR10 platform

Multiple manufacturers have factory loadings in 125gr..308.
For short range & reduced recoil, light bullet weight would be beneficial for 3gun as the op's intended use.

 

[Cosmic338]

Multiple manufacturers have factory loadings in 125gr..308.
For short range & reduced recoil, light bullet weight would be beneficial for 3gun as the op's intended use.

I know that but I’m just saying for .308 Winchester, it seems short.

 

[fdkay]

I would recommend that you seat the bullets in the case instead of running semi-fixed ammo.

 

[XTR]

Your rifle just has a long freebore. If it shoots don't worry about it. When you re-barrel get a chamber cut for your bullet of choice

 

[1moaoff]

I know that but I’m just saying for .308 Winchester, it seems short.

Then don't load them

 

[1moaoff]

Don't load them if you are worried sell them to me I am running low only 10,500 left.... I will buy them at 2019 sale pricing with free shipping.

 

[db2000]

View attachment 7521373
Don't load them if you are worried sell them to me I am running low only 10,500 left.... I will buy them at 2019 sale pricing with free shipping.

“Hey big man lemme hold a dolla”

 

[smoothy8500]

I know that but I’m just saying for .308 Winchester, it seems short.

You and the OP are worrying and/or making assumptions about a non-issue such as a long jump.

 

[smoothy8500]

sell them to me I am running low only 10,500 left....

Nice stash! The 125's are perfect with mitigating recoil and muzzle jump in M14 and '06 Garand loads for 200yd Offhand and Rapids. I would imagine the run-n-gun shooters benefit even more so.

 

[1moaoff]

Nice stash! The 125's are perfect with mitigating recoil and muzzle jump in M14 and '06 Garand loads for 200yd Offhand and Rapids. I would imagine the run-n-gun shooters benefit even more so.

They are my go to practice round for anything inside 400
Positional or groups. My load isn't great but I load it on a progressive so its fast.
Just enough recoil and noise that it keeps you honest

 

[Cosmic338]

Then don't load them

I don’t