.308 Winchester

[Rob01]

Soon we will have a pinned catastrophic failure thread, complete with stitches!

Yup. Hopefully only stitches. If you want 300WM performance then get a 300WM. Pushing the 308 to those pressures is asinine in my opinion. Also plan on 300WM barrel life.

 

[nick338]

Some very early testing with a new 18.5" build with 210 Sierra Matchkings and N550. Both 5 shot groups.

 

[stello1001]

Some very early testing with a new 18.5" build and 210 Sierra Matchkings and N550.. Both 5 shot groups.

View attachment 8658121View attachment 8658122

Are these standard 308 loads? Or are you loading very long on a long action, single feeding, etc?

 

[nick338]

Short action Bumblebee, magazine length. These are loaded at 2.95" OAL.

 

[918v]

I did that with 200.20x’s but used Winchester commercial brass and got pressure signs at 2650 from a 24” barrel. Accuracy came in at 2580 and was very usable until the temp dropped in the 30’s and I accepted that a 12” twist is not enough for this projectile.

 

[lawnchair 04]

Some very early testing with a new 18.5" build with 210 Sierra Matchkings and N550. Both 5 shot groups.

View attachment 8658121View attachment 8658122

Which McMillan model is that?

 

[nick338]

Which McMillan model is that?

A1-3. Same as the Darpa XM3, only with adjustable cheekpiece.

 

[45-90]

Short action Bumblebee, magazine length. These are loaded at 2.95" OAL.

If you set up your rifle to take the correct detachable mags something like 2.990" MDT minus center plate, will feed through a standard Rem short action...available on line everywhere.
With a little inletting on your part, presto you too, can have the same setup.

This will help with the 200 gr and heavier to seat out past the ogive.
These are 208 Bergers at 2700 fps in $600 rifle build with a new Bartlein 5R 9 twist 22" barrel, bottom metal, magazine, and muzzle brake ....used parts on a trued Rem 700.
The rifle was a previous factory Rem LTR, with a shot out barrel.

 

[straightshooter1]

If you set up your rifle to take the correct detachable mags something like 2.990" MDT minus center plate, will feed through a standard Rem short action...available on line everywhere.
With a little inletting on your part, presto you too, can have the same setup.

This will help with the 200 gr and heavier to seat out past the ogive.
These are 208 Bergers at 2700 fps in $600 rifle build with a new Bartlein 5R 9 twist 22" barrel, bottom metal, magazine, and muzzle brake ....used parts on a trued Rem 700.
The rifle was a previous factory Rem LTR, with a shot out barrel.

I've got a couple Alpha mags that'll take COAL's of that length (2.979"). But I don't know if Alpha is still doing business or if there are suppliers that have them???

 

[nick338]

If you set up your rifle to take the correct detachable mags something like 2.990" MDT minus center plate, will feed through a standard Rem short action...available on line everywhere.
With a little inletting on your part, presto you too, can have the same setup.

This will help with the 200 gr and heavier to seat out past the ogive.
These are 208 Bergers at 2700 fps in $600 rifle build with a new Bartlein 5R 9 twist 22" barrel, bottom metal, magazine, and muzzle brake ....used parts on a trued Rem 700.
The rifle was a previous factory Rem LTR, with a shot out barrel.

I'm already setup for Hawkins Precision hunter extended mags. They have an internal length of 2.980"

 

[tekmann2377]

Hey guys. I have an Sig Cross and waiting for a new comp profile 308 barrel from Straight Jacket Armory. I am building a steady hunting rifle. I say that because length plays into the equation but weight does not. So the barrel will be 18” long. I have a young son who shot that rifle last deer season in Federal 6.5 creed amd he did well with it. I was wondering, how slow can I safely shoot 308 ammo. I know he won’t shoot over 250 yards and would like to find something lower recoil for him. Looking at MV only, 2,300fps works all the way out to 400 yards.

A reduced load for H4895 or IMR 4895 under a Hornady 125 SST is your huckleberry for this. Shoot for a starting velocity of 2500-2600 fps, and a minimum impact velocity of 1900 fps at your maximum range.

They shoot soft and despite the reduced loads are often very accurate.

 

[PRS-JohnB]

A reduced load for H4895 or IMR 4895 under a Hornady 125 SST is your huckleberry for this. Shoot for a starting velocity of 2500-2600 fps, and a minimum impact velocity of 1900 fps at your maximum range.

They shoot soft and despite the reduced loads are often very accurate.

I was leaning towards a 140g. He was shooting a 140g 6.5 last season around 2550 and was doing great with it. This rifle will be about 2bs heavier so if I can get a good 308 load that keeps it similar, he should be good to go

 

[Doom]

He should take his own advice.

 

[MikeMiller]

Yup. Hopefully only stitches. If you want 300WM performance then get a 300WM. Pushing the 308 to those pressures is asinine in my opinion. Also plan on 300WM barrel life.

Rob, as you know I shot F TR at a high level for many years. We long throated and single shot 200’s in 30-32” barrelsas fast as we could get groups with. Bullets loaded so long it was hard to get them to stay in the case sometimes. Everyone I saw try to go over 2700 fps ended badly. 2600 was right around perfect. At mag length those loads would of grenaded lots of actions

I say go 300wm if you want 300 WM velocities. Now I long load 300wm with 200’s and run 2950 fps with no worries