What a kick in the ass .22 Dasher

[BoydAllen]

This was plainly cited: "The dasher is great case. Does everything a 22-250 ackley does but only better. Better brass, less powder and better barrel life." Your reading comprehension is on your shoulders,not mine.

I don't fixate small pockets and if/when given the choice,will always go large to fend ambient temp swings.

Hint.

My bad on the reading. I got in too big of a hurry. A friend of mine had a MkI .22 Cheetah that he loaded ball powder in. In the winter he experienced hang fires. Changing to a small rifle magnum primer fixed the problem, with excellent accuracy. For cases of that size, I do not believe that small primers are a problem, and knowing that they take more pressure without expanding unduly can come in handy. I generally do not load to pressures where primer size is an issue, but there are accuracy issues as well. When Lapua was designing the 6.5x 47, I believe that they tested both large and small primer versions. It might also be noted that there is enough demand that they find it worthwhile to offer a small primer .308 case. Recently they have started making 6.5 Creedmore brass, with small primer pockets. Back in the day when Palmisano and Pindel first came up with the PPC the reason that they were attracted to the .220 Russian case as a starting point was its small primer pocket and small flash holes in combination with the capacity that they were looking for. Yes, at some point a large primer is pretty much a requirement. I am well aware of that.

 

[johnfred1965]

If I can shoot the same velocity with less powder and without pressure related problems, then by my definition that case is more efficient. Some brass is tougher. Apples for apples, cases that take small primers can take more pressure than those with large pockets in the same caliber. Minimum taper sharp shoulder designs control headspace better and have less bolt thrust, allowing them to be run hotter without primers flatteningprimers as much or bolt lift becoming an issue. I think that we all know that the pressure is higher when we do this. The question is whether that pressure is a problem. Some PPC shooters routinely run very high pressures without problems. This is not a recommendation, but they do. They are also some of the most knowledgeable reloaders and their example should not be followed by by most shooters.

Pressure measurements and comparisons are typically based on peak presssure signs, where True measure of case potential is the area under the pressure curve. The smaller, "more efficient" case can, and will in some instances, produce more area, and thus more velocity.

 

[Phil]

I was under the impression that the comparison was between a .22 Dasher and a standard .22-250. Yes, the .22-250 AI is a different situation. Good cases abound, but without reforming can you name me a small primer .22-250 case source?

Boyd,

It`s not the same, but you could do a .22 Creedmoor with an AI shoulder on it to utilize the small primer pocket brass, i would`t think it would be too much trouble to do.....

Just a thought....


Phil.

 

[6xcshooter]

I tell you what is fun, I shoot my 22 dasher with 55gr blitzking at 3700 fps. Its a 8 twist barrel. Have shot some 5 shot groups in the .1's . prairie dog disintegrator.

 

[Brians356]

Boyd,

It`s not the same, but you could do a .22 Creedmoor with an AI shoulder on it to utilize the small primer pocket brass, i would`t think it would be too much trouble to do.....

Just a thought....


Phil.

Several gunwriters of late have mused on how similar the Creedmoor body is to the venerable overachiever 250 Ackley's. For fun I got a fired 6.5 Creedmoor case from someone, greased it up, and ran it through my Redding 250 Ackley 40-deg FL die. It worked, but I can't find the case now to photograph or measure the OAL. (Since I fireform my 250 AI "bulletless" from 22-250, I don't imagine I'd ever need to do this, but it's an alternative.)

Incidentally, the 22 Nosler is essentially a 90% scale Creedmoor. Coincidence?
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[OKyote73]

Several gunwriters of late have mused on how similar the Creedmoor body is to the venerable overachiever 250 Ackley's. For fun I got a fired 6.5 Creedmoor case from someone, greased it up, and ran it through my Redding 250 Ackley 40-deg FL die. It worked, but I can't find the case now to photograph or measure the OAL. (Since I fireform my 250 AI "bulletless" from 22-250, I don't imagine I'd ever need to do this, but it's an alternative.)

Incidentally, the 22 Nosler is essentially a 90% scale Creedmoor. Coincidence?
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Over on saubier, there was a reply to my 250AI brass hunt that said he used 6.5 creedmore brass with no problems. Fit and fired just fine after neck sizing. I haven't tried it yet but with the new Lapua CM brass I will be giving it a try

 

[Brians356]

Over on saubier, there was a reply to my 250AI brass hunt that said he used 6.5 creedmore brass with no problems. Fit and fired just fine after neck sizing. I haven't tried it yet but with the new Lapua CM brass I will be giving it a try

One thing I wouldn't prefer (besides the CM headstamp) would be the more pronounced CM extractor groove on my 250 AI cases.
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