Bill Calfee
Gun Fool
Since we're discussing chambering........
CYA friends:
Since we're discussing chambering, there's an interesting little secret about why some of this late Lapua is kicking it so killer in fully engraved Eley chambers.
Take the back to back 2400+ ARA aggs kicked out by Chuck "Deuces Wild" Morrell and Mike "Big Dog" Sherrill at the Barn a couple months ago..
And then Tony "TDX" Harper's indoor three card 10-SHOT record of 366, which is probably going to stand for some time to come.
And then Chuck "Deuces Wild" Morrell and is simply unbelievable 750 X 65X at the Triple Crown last year......outside!
CYA friends, all of these monumental rimfire accuracy accomplishments were kicked out with late Lapua in fully engraved Eley chambers....
I know this for a fact, since I cut and finished all of those chambers......
The question is, why?...........Why is this late Lapua kicking it like it does, in fully engraved Eley chambers?
Here's the interesting little secret as to why:
First of all, maximum accuracy is extracted from match grade, 22 Long Rifle ammunition when it's used in fully engraved chambers....
By fully engraved chambers, I mean, fully engraved less enough room for the CL to build up.
Secondly, I'm going to tell something that any serious seeker of rimfire accuracy already knows:
The late Lapua averages about .015" longer, from the head of the case to the front shoulder of the front driving band, than does Eley.
(This "average" difference takes into account the variation in the working length of Eley, and, the slight difference in case lengths between the two.)
Therefore, the late Lapua, when used in a fully engraved Eley chamber, has about .015" more support/alignment to the bullet, than does Eley.
And here's the biggie.....the Lapua gains that additional support, while maintaining the "exact" same amount of CL room as does the Eley.
____________________
CYA friends, today in trying to advance rimfire accuracy, a few thousandths worth of improvement is a step forward.
That additional .015" of extra support/alignment that Lapua gains from being shot in a full-on Eley chamber, is causing some big numbers to be kicked out.
_______________________
Now, here's the rub for Eley:
If one cut a chamber, for Eley, with the same support/alignment of Lapua, you wouldn't get half way through a card before the CL would start producing flippers...
Your friend, Bill Calfee
CYA friends:
Since we're discussing chambering, there's an interesting little secret about why some of this late Lapua is kicking it so killer in fully engraved Eley chambers.
Take the back to back 2400+ ARA aggs kicked out by Chuck "Deuces Wild" Morrell and Mike "Big Dog" Sherrill at the Barn a couple months ago..
And then Tony "TDX" Harper's indoor three card 10-SHOT record of 366, which is probably going to stand for some time to come.
And then Chuck "Deuces Wild" Morrell and is simply unbelievable 750 X 65X at the Triple Crown last year......outside!
CYA friends, all of these monumental rimfire accuracy accomplishments were kicked out with late Lapua in fully engraved Eley chambers....
I know this for a fact, since I cut and finished all of those chambers......
The question is, why?...........Why is this late Lapua kicking it like it does, in fully engraved Eley chambers?
Here's the interesting little secret as to why:
First of all, maximum accuracy is extracted from match grade, 22 Long Rifle ammunition when it's used in fully engraved chambers....
By fully engraved chambers, I mean, fully engraved less enough room for the CL to build up.
Secondly, I'm going to tell something that any serious seeker of rimfire accuracy already knows:
The late Lapua averages about .015" longer, from the head of the case to the front shoulder of the front driving band, than does Eley.
(This "average" difference takes into account the variation in the working length of Eley, and, the slight difference in case lengths between the two.)
Therefore, the late Lapua, when used in a fully engraved Eley chamber, has about .015" more support/alignment to the bullet, than does Eley.
And here's the biggie.....the Lapua gains that additional support, while maintaining the "exact" same amount of CL room as does the Eley.
____________________
CYA friends, today in trying to advance rimfire accuracy, a few thousandths worth of improvement is a step forward.
That additional .015" of extra support/alignment that Lapua gains from being shot in a full-on Eley chamber, is causing some big numbers to be kicked out.
_______________________
Now, here's the rub for Eley:
If one cut a chamber, for Eley, with the same support/alignment of Lapua, you wouldn't get half way through a card before the CL would start producing flippers...
Your friend, Bill Calfee
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