Any thoughts on a 257 SPC?

A 6.8 SPC necked down to take the deified quarter bore.

Should be light recoil and a 600 yard shooter!

Varmints to target to deer...


With the same 115 120 grain weight bullets as the SPC you will have similar hunting velocities of 2700 FPS but much better down range performance while still doubling the nominal 223 bullet weight or shooting say the 100 grain bullets around 3,000 fps performance and target shooting.

Micro bolt action or ruger ranch rifle or ar15 platorm.

Yes a 6.0 SPC or 243 SPC has merrit but the 25 is cooler IMHO
6MM people already have the 6 PPC

boom stick! Do you happen to know the useable case capacity of the 6.8 SPC ? roger

Case capacity seems to be almost 34 grains capacity.
Up to the neck/shoulder junction I do not know.

Just shoot a 6.5 Grendel, it will do anything a 6.8 spc or 257 spc will do with much better bullets, and its good to 1000 yds....

Boom,

I like it!

I have been playing with this idea for a while.Just gathering the funds now to get the reamer and dies made.
I already shoot the 25x39 with the 75gr v-max bullet out to 600 yards,so I figure this would give me a little more reach while keeping low recoil.
One of these days.

Yes I think this has 1000 yard target potential.

Will it be a simple neck down like the picture?

I think it will be a good low recoil hunting round with 100 to 120 grainers.

quote:

Originally posted by plainsman456:
I have been playing with this idea for a while.Just gathering the funds now to get the reamer and dies made.
I already shoot the 25x39 with the 75gr v-max bullet out to 600 yards,so I figure this would give me a little more reach while keeping low recoil.
One of these days.

If one could find a used CZ527 .223 Rem it would make for a simple rebore/rechamber one would think. Of course good luck finding a used 527 lol I have one on layaway but its a 204 and I'm keepin in that way.

quote:

Originally posted by MileHighShooter:
If one could find a used CZ527 .223 Rem it would make for a simple rebore/rechamber one would think. Of course good luck finding a used 527 lol I have one on layaway but its a 204 and I'm keepin in that way.

The 6.8 boltface is about .422, so no joy using a 223 action/bolt. 7.62x39...maybe so.

If sticking with an AR platform, the .25 bullets will only increase the problem of bullet seating, at least those mid-to-heavy weights for caliber...6.8/110 Noslers and Barnes have their heel well past the shoulder, often very compressed loads (mag length issues).
A bolt gun would certainly help the issue...

Is there enough metal on the .223 face bolt CZ to open to .422? Not sure if they use a totally different head on the 7.62 models but I would imagine for costs sake they just open it up. A rebore/chamber is 300$, figure another 75$ for the bolt face, and possibly some feed work and that's still below the cost of buying a 527 action online and having to thread a barrel on.

Personally I would stay with 87-100gr bullets....maaaaaaybe the 110gr accubond. I wonder about the AB being too long however?

Looking at the bullet profiles I see that the 100 grain bullets would be the sweet spot for this case.

100 grainers @ 2,800 to 2,900 will be good for enough for deer.

223 rem nominal bullet weight is about 60 grains
257 SPC nominal bullet weight I think will be 100 grains
6.8 SPC and 6.5 Grendel nominal bullet weight is between 115 to 120 grains.

I think this has a potential to be varmint/target/deer or 257 vartageer lol get it like the 20 vartag. gun jokes are just so lame...

These 100 grain speer spitzer boat tails I see as an ideal bullet

Shooting the lighter 100 grain bullets faster will give you the FPE of the 6.8 but at longer ranges and nearly doubling the bullet weight of the 223.

I guess if anything that would be the "Magic" or niche for this cart. delivering the promise of more smack down of the 6.8 SPC but at longer range and higher velocity

The 6.8'ers are a bizzy bunch, as Nosler brought out a 100gr Accubond, and Barnes has prototyped a 95gr TTSX.
Some strong velocities are being reported from 6.8 AR shooters, but the pressures are likely way over anything SAAMI or industry standards.
Load `em till you get ejector swipes, then back off a bit...don't need no stinkin' load manuals

The "PDK" series of cartridges exist, based off the 6.8.
http://www.pdk20.com/

Probably not much difference in performance from a 250 Savage in a smaller neater package.

Well the problem will only increase.

Lower BC and lower SD

The BC and SD at 115 and 120 grains was already bad.

If the case was designed around a 100 grain bullet then they would have gone with a 257 instead of the 6.8

CQC and within 300 yards no issue but the 257 SPC with the same 100 grain bullet weight will not compromise but gain.

257 SPC = 25 Remington shortened about 2/10 in the body and about 1/10 in the neck.

http://stevespages.com/page8d.htm

Bruce

Yes I understand that this is reinventing the 25 rem but this is for a micro action or ar15

6.8 brass will be easy to form and should work just fine in existing 6.8 mags.

I notices that SSA has a 85 grain load for the 6.8 going 3,000 fps out of a 16" barrel.

Again if they were designing the cart for this light of bullet the 257 makes more sense.

If you match the 25 Rem shoulder, you could probably load using shortened 25 Rem dies.

Bruce

True but I think the ease and simplicity of just necking down to me makes more sense.

Rather have 6mm WOA for the match bullets.

quote:

Originally posted by bcp:
257 SPC = 25 Remington shortened about 2/10 in the body and about 1/10 in the neck.

http://stevespages.com/page8d.htm

Bruce

I was wondering when someone was going to notice this fact..

however at the same time, the old 25 Remington is not a bad idea..

of course wouldn't this be EASIER, if someone just wanted to do a 25 bore on the Rem BR case?

not withstanding that, I have thought about doing a 25 Remington on a Ruger action before..

think it would be a fun round, for plinking and such, but for deer hunting at 600 yards, it is a pitifull choice.
600 yards is way beyond the capibility of the vast majority of hunters with any cartridge.
...tj3006

quote:

Originally posted by seafire2:

quote:

Originally posted by bcp:
257 SPC = 25 Remington shortened about 2/10 in the body and about 1/10 in the neck.

http://stevespages.com/page8d.htm

Bruce

I was wondering when someone was going to notice this fact..

however at the same time, the old 25 Remington is not a bad idea..

of course wouldn't this be EASIER, if someone just wanted to do a 25 bore on the Rem BR case?

not withstanding that, I have thought about doing a 25 Remington on a Ruger action before..

Yes a 25 PPC would be good too.

I think the SPC case is enough of a case though.

I don't think I said deer hunting at 600 yards but out to 300 yards that would be 99% of deer hunting.

I think a target out to 600 would be good.

quote:

Originally posted by Thomas Jones:
think it would be a fun round, for plinking and such, but for deer hunting at 600 yards, it is a pitifull choice.
600 yards is way beyond the capibility of the vast majority of hunters with any cartridge.
...tj3006