TXAoudadKlr
Well-Known Member
What are some of your thoughts on necking a 6.5PRC to 6mm or even .224 besides the obvious lack of barrel life? This would be for heavy for caliber bullet on both!
Thoughts on 22 and 6mm PRC
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Varminator 911
Well-Known Member
My thought is that the Creedmor case while under powered for my taste at 6.5 it's about right at 22 and maybe 24 caliber. The PRC seems like too much of a good thing esp at 22. I can see the benefits of "overbore" for big game cartridges. We tend not to shoot those rounds as much.
For varmints or just having fun shooting a lot I'd rather not burn out the barrel so fast.
For varmints or just having fun shooting a lot I'd rather not burn out the barrel so fast.
TXAoudad -
Howdy !
My thoughts are similar to those expressed by Varminator.
I wildcatted .35 Remington down to .224" cal back in the late -70's, for use as the ideal case capacity for shooting .224" cal 55gr varmint bullets from a 24" 1-14 barrel.
It was good on groundhogs out to 510yd ( my longest kill w/ that barrel ).
.22-35 Rem was also superb when chambered in a 28" 1-8 barrel, and shooting
groundhogs w/ 75"A"-Max . This set-up had valid 1,000yd dual-role' varmint/target capability.
.22-35 Rem case capacity is between that of a stock .22-250, and a .22-250AI.
While 6mm Remington has @55gr H2O case capacity and .243Win @ 54gr capacity,
there's not a huge number of shooters that use the .224" cal wildcat iterations of those cases.
And, one doesn't see a whole bunch of shooters extolling the virtues of the .223WSSM, which has 52gr case capacity.
IMHO - the current popularity and even increase in number of .22-47L, .22XC, and notional .22 Creedmoor wildcats points to the useful performance that can be obtained
from .224" cal and 6mm cal cases in the neighborhood of 49 - 51gr H2O capacity.
With regard,
357Mag
Howdy !
My thoughts are similar to those expressed by Varminator.
I wildcatted .35 Remington down to .224" cal back in the late -70's, for use as the ideal case capacity for shooting .224" cal 55gr varmint bullets from a 24" 1-14 barrel.
It was good on groundhogs out to 510yd ( my longest kill w/ that barrel ).
.22-35 Rem was also superb when chambered in a 28" 1-8 barrel, and shooting
groundhogs w/ 75"A"-Max . This set-up had valid 1,000yd dual-role' varmint/target capability.
.22-35 Rem case capacity is between that of a stock .22-250, and a .22-250AI.
While 6mm Remington has @55gr H2O case capacity and .243Win @ 54gr capacity,
there's not a huge number of shooters that use the .224" cal wildcat iterations of those cases.
And, one doesn't see a whole bunch of shooters extolling the virtues of the .223WSSM, which has 52gr case capacity.
IMHO - the current popularity and even increase in number of .22-47L, .22XC, and notional .22 Creedmoor wildcats points to the useful performance that can be obtained
from .224" cal and 6mm cal cases in the neighborhood of 49 - 51gr H2O capacity.
With regard,
357Mag
snox801
Well-Known Member
I like the idea of a 6mm. I think 22 would be real over bore.
TXAoudadKlr
Well-Known Member
I remember reading about the .220 redline not long ago (Saum) based. I need to see if the guy put any more blogs up about it.
The 6mm does sound like a more viable option though. 90gr accubond doing 3500fps would be hell on deer and antelope
The 6mm does sound like a more viable option though. 90gr accubond doing 3500fps would be hell on deer and antelope
alf
Well-Known Member
I'll have 1st hand reports on a 6 version in a couple months......
orangediablo
Well-Known Member
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Something similar to the 22 PRC was experimented with a little while back. He necked down a SAUM case to 22. Looks sexy and fast.
http://forum.accurateshooter.com/threads/gentlemen-i-present-the-220-redline.3934327/
http://forum.accurateshooter.com/threads/gentlemen-i-present-the-220-redline.3934327/
TXAoudad -
The " .220 Redline " poster has recently stated he is discontinuing any further posts, as he was being " monitored " at that website.
For info:
The .220 Redline has significant case capacity. Based on that capacity, the calibre, and the chosen barrel length; the 'Redline rifle has an expansion ratio of around 4.5 .
In the Expansion Ratio chart I saw in " Guns & Ammo 1974 Annual ", ballistician
Homer Powley only listed expansion ratios as-low-as 4 .
The 'Redline's inventor has been / is doing some great things, and is doing so with full knowledge of that 4.5 expansion ratio.
With regards,
357Mag
The " .220 Redline " poster has recently stated he is discontinuing any further posts, as he was being " monitored " at that website.
For info:
The .220 Redline has significant case capacity. Based on that capacity, the calibre, and the chosen barrel length; the 'Redline rifle has an expansion ratio of around 4.5 .
In the Expansion Ratio chart I saw in " Guns & Ammo 1974 Annual ", ballistician
Homer Powley only listed expansion ratios as-low-as 4 .
The 'Redline's inventor has been / is doing some great things, and is doing so with full knowledge of that 4.5 expansion ratio.
With regards,
357Mag
D
Deleted member 103481
Guest
I'm highly interested in a 6mm
Ckleeves
Well-Known Member
A friend of mine just built a 6mm saum. It will push the Berger 105 hybrid about 3425. It's been a easy cartridge to get a load for and has shot great since he built it. I doubt barrel life is going to be anything great but for a lightweight hunting rifle it will be good enough.
TXAoudad
I cannot imagine a 6mm or even worse a 22 using the 6.5 PRC case. IMO the 6mm-284 is the largest case for the 6mm and perhaps the 22-243 Win is plenty in the case capacity arena.
30" 1 in 7.5 twist 6mm-284 yielded 3500 fps with a 30" barrel. Barrel lasted 1000 accurate rounds. Never used it for prairie dogs or target competition.
For grins I had a 7 rem mag reamer reground to make a 6mm-7 Rem mag. Used 264 win mag cases. Intent was to use a 24" barrel and obtain 3500 fps with 105 gr bullets, in essence making the 6mm-284's performance without the long barrel. While I got the velocity I wanted, the resultant powder fouling and carbon buildup was prohibitive. It built up so fast I had a hard time developing a load. I used a 243 win Remington take off to try it and perhaps that was part of the reason for the fouling issues.
I remember Ross Seyfried's article on a 6mm-264 he made called the mach IV that had carbon buildup issues. He said he didn't clean it often enough and a hard ceramic like substance developed in the throat and couldn't be removed. He had to scrap that first barrel. Second barrel was thoroughly cleaned very frequently to prevent that carbon issue. Perhaps today there are cleaners available to prevent it.
If you build one please share all the details with us here.
I cannot imagine a 6mm or even worse a 22 using the 6.5 PRC case. IMO the 6mm-284 is the largest case for the 6mm and perhaps the 22-243 Win is plenty in the case capacity arena.
30" 1 in 7.5 twist 6mm-284 yielded 3500 fps with a 30" barrel. Barrel lasted 1000 accurate rounds. Never used it for prairie dogs or target competition.
For grins I had a 7 rem mag reamer reground to make a 6mm-7 Rem mag. Used 264 win mag cases. Intent was to use a 24" barrel and obtain 3500 fps with 105 gr bullets, in essence making the 6mm-284's performance without the long barrel. While I got the velocity I wanted, the resultant powder fouling and carbon buildup was prohibitive. It built up so fast I had a hard time developing a load. I used a 243 win Remington take off to try it and perhaps that was part of the reason for the fouling issues.
I remember Ross Seyfried's article on a 6mm-264 he made called the mach IV that had carbon buildup issues. He said he didn't clean it often enough and a hard ceramic like substance developed in the throat and couldn't be removed. He had to scrap that first barrel. Second barrel was thoroughly cleaned very frequently to prevent that carbon issue. Perhaps today there are cleaners available to prevent it.
If you build one please share all the details with us here.
alf
Well-Known Member
For all practical purposes, the 6.5-284 and the 6.5 PRC have the same capacity, maybe a slight edge to the PRC, so I anticipate 6 PRC velocities to be about the same as a 6-284. My 26" 6-284 would run at 3400 with 105 Bergers.
If I can't find a 7 or 7.5 twist to spin the 110 SMK's I have, I'll settle on 105's in an 8" twist at a little more velocity. Might be a wash in the end w/ pointed VLD's under 1K.
If I can't find a 7 or 7.5 twist to spin the 110 SMK's I have, I'll settle on 105's in an 8" twist at a little more velocity. Might be a wash in the end w/ pointed VLD's under 1K.
TXAoudadKlr
Well-Known Member
The 220 redline with an 88gr ELD-M looks fairly impressive on paper. Not sure where this fascination with an 22 Uber magnum is coming from. The blazing speed that the smaller bore can get had always intrigued me.
CKleeves that 6 Saum is interesting, I could possibly match the ballistics very closely to that of my 300AX minus the KE part.
CKleeves that 6 Saum is interesting, I could possibly match the ballistics very closely to that of my 300AX minus the KE part.
alf
Well-Known Member
What powder did he settle on?
