.308 Winchester

[45-90]

View attachment 8712984
This was a 5 shot string

M118 Brass
CCi 200 Primer
42.0gr Varget
2.8" C.O.A.L.
I forget the base to ogive measurement but can get it if it were wanted.

Duno how the heck you plan to gain 450+ fps with those hybrid cases but stay safe... 42gr of varget is basically 100% case capacity... duno what it actually is but if it's not it's darn close to compressing. I could see some powders maybe getting 100fps more but not that much... like just running out of case volume unless you just move to a double or triple base powder?

Not to too my own horn but I'm very pleased with the SD...

Oh rifle was a CZ600 Range. (24" barrel)

Already running 177 SMK at 3045 fps in 22" 308 with hybrid cases. And 3126 fps in the long barrel.
So the 174 ELD- VT should have 3000 fps velocity with several powders.
They bullets have arrived, so it's time go get around to loading them.

 

[Mean_Man]

Already running 177 SMK at 3045 fps in 22" 308 with hybrid cases. And 3126 fps in the long barrel.
So the 174 ELD- VT should have 3000 fps velocity with several powders.
They bullets have arrived, so it's time go get around to loading them.

what powder(s) are you using and what barrel lengths if you don’t mind me asking? Also how are they grouping?

 

[Mean_Man]

Got some 174 gr eld-vt coming, slightly higher BC than the 176 Atips according to Hornady....573 g1 BC, should be at 3000 fps in hybrid cases and a 22" barreled 308...we'll see

Guess what my friend handed me a box of today lol…

 

[45-90]

Guess what my friend handed me a box of today lol…

Oh, maybe some of these?

 

[45-90]

what powder(s) are you using and what barrel lengths if you don’t mind me asking? Also how are they grouping?

I have 8 308s autos, and bolts...
I only run hybrid cases with high pressure loads in bolt guns for obvious reasons.

I have 308s in lengths of 16, 2,18, 20 (dead), 22, 24, 26 (dead), 27, & 30 inches.
Twists 12, 11.25, 10, 9, & 8.
The 3045 fps with 177s was in the light weight 22" 9 twist.
The 3126 fps was 177 gr SMK in 30" 8 twist heavy Palma, long action, alum chassis, for shooting 200 SMK 2900 fps to 250 Atips a bit over 2500 fps with hybrid cases or Lapua cases with a bit less velocity.

Powder was RL 17 in this particular test with 177 SMK.
Accuracy is good, usually a bit lower than max pressure loads around 50 fps from top loads.

 

[db2000]

Not the fastest but damn did they group…and from a Savage lol

Savage APO 24”
Garmin Zero

6/21/25
90F 56% 30.15in

Berger 185 Classic Hunter
Bullet BTO 0.7050
Varget 42.7
FGMM Br x 1
210M
COL 2.0190
BTO 2.0450
2556, 2664, 2661, 2658, 2681, 2685, 2658, 2670, 2659, 2662 SD 10 ES 30

 

[Mean_Man]

Oh, maybe some of these?

yep... just one box though since we're trying to settle on a projectile.

on that topic... how much of an improvement does a graphite dry lube tend to make when the case mouth is dipped to group size?

I clean the case mouths with a brush but never thought of lubricating them as every lube I thought of was oil of some sort forgot about dry lube like graphite.

 

[Rob01]

yep... just one box though since we're trying to settle on a projectile.

on that topic... how much of an improvement does a graphite dry lube tend to make when the case mouth is dipped to group size?

I clean the case mouths with a brush but never thought of lubricating them as every lube I thought of was oil of some sort forgot about dry lube like graphite.

Why do you clean them with a brush? Don’t remove something then look to put it back. Just making your life harder and adding steps. The fouling in the neck/mouth works like a lube. Leave it there.

 

[Mean_Man]

Why do you clean them with a brush? Don’t remove something then look to put it back. Just making your life harder and adding steps. The fouling in the neck/mouth works like a lube. Leave it there.

Well... I had thought cleaning the case mouth would possibly cause a more uniform grip on the projectile... and so a more uniform release at a specific pressure. Also wanted to make sure there were no continents though I pick up my fired brass off the table, my friends rifle has a spring loaded ejector so I tend to have to pick his cases up off the ground.

 

[Rob01]

Well... I had thought cleaning the case mouth would possibly cause a more uniform grip on the projectile... and so a more uniform release at a specific pressure. Also wanted to make sure there were no continents though I pick up my fired brass off the table, my friends rifle has a spring loaded ejector so I tend to have to pick his cases up off the ground.

Tumbling cleans out anything like ground material. All mine get tossed to the ground in matches and they work just fine after tumbling. Never anything in the neck that shouldn’t be there.

 

[Mean_Man]

Tumbling cleans out anything like ground material. All mine get tossed to the ground in matches and they work just fine after tumbling. Never anything in the neck that shouldn’t be there.

I anneal before I do anything, the toss them in the tumbler with walnut media for an hour, then deprime/size… yeah it’s probably a waste of my time… anyway about this graphite in the case mouth, does that really make a noticeable difference or are we talking tiny tiny improvements? Or is it more a consistency thing? Like helps get rid of “flyers”?

 

[Rob01]

I anneal before I do anything, the toss them in the tumbler with walnut media for an hour, then deprime/size… yeah it’s probably a waste of my time… anyway about this graphite in the case mouth, does that really make a noticeable difference or are we talking tiny tiny improvements? Or is it more a consistency thing? Like helps get rid of “flyers”?

No idea as I never saw a need for it. Sounds like someone who wet tumbles might use as they remove everything in the brass to make it super clean and shiny. Adding graphite will add what they just removed and help add to their OCD. lol