Ok been looking around and what would be the ideal use for a chamber with no throat? Pac nor list a few with no throat?
Anyway I am looking at shipping of my long ADL to be made to either a 25-06,6.5-06, or one of those cals off the 284. Probably do the 6.5X284. Worked up a deal with Riccasso for a Mac Kevlar Mtn Rifle for the long action to call home. Looking to build a #2 at least 24" possibly 26 or 28" or a #3. Don't know if they will flute those anorexic tubes <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> Anyway I don't want to cheat myself on useful velocity with a short barrel, so what is optimum for those rounds to use. No really big game will be hunted with the gun, just small whitetail and songdogs. Kind of like the idea of a sheep rifle, just not used for that purpose.
Opinions are wanted and welcome. Btw I love to seat bullets way long so I prefer the idea of the 284 based stuff in a long action.
I have read a few threads and taking it all in for the final say on length and contour. Really undecided on the hole size too. Seems like bxroads had a good thread I got a lot off of too.
What does it mean when the primers fall out of the case?
Ever sense I had my first custom rifle done, I purchase my own reamers, I order a floating pilot no throught reamer, and also purchase a throught reamer, along with headspace gauges, I do this for each caliber, here is where to buy your own reamers http://www.pacifictoolandgauge.com
When using a long action with the longer cases as you mention, and wanting a longer barrel, I'd recommend a #4 or #5 barrel and have it fluted, To me a lighter barrel should be cut shorter, but thats just my thinking. If you stick with a smaller bore such as .257 caliber, they can run the flutes deeper, saving more weight, and will add to the looks.............
I am not absolutely going to do it, but I remember with the last 308 and my 25-06 I could not seat long enough to touch the lands and feed through the magazine. With this 284 based round I could, not that I seat that long all the time. Usually try for 3 thou off. I have noticed at a few other places that 30 thou off is a good place to be at. <img src="/ubbthreads/images/graemlins/confused.gif" alt="" /> Anyway the long pointy bullets are hard to get to feed and be close.
What does it mean when the primers fall out of the case?
From the description of the stock sounds like you want something fairly light. I happen to favor the 6.5x55 so the bore size for me would be .264. As far as seating them "way out there" the Remmy on my Mtn Rifle has a magazine length of about 3.700+" (think 3.800 is max). If you use a 25-06 case and seat a 130gr TSX (longest bullet in .264 I happen to have) to the base of the neck your looking at 3.500+- max OAL. Sooooo, this what I would do:
1. 6.5-06. Cheaper and more available brass, probably feed better as well. Although I have had Mausers chambered in .284 that would feed empty cases. Case capacity for a 6.5-284 will be almost identical. 2. 26" barrel #2 (fairly light rifle?). Even though I like 22-24" barrels. If it's too long for you, you can cut 1" or 2" off. Twist- go with a max of 1-9, preferably with 1-8 since you'll try all kinds of bullets. Premiums are generally longer than traditional bullets due to their construction (TSX for example). 3. Buy the dies and seat several different bullets to the same OGIVE length. Say the aforementioned 6.5-06 with 130 TSX was 3.000" to the ogive-cartridge OAL was 3.500", use another case and seat a 140 Nosler Partition to the same 3.000" ogive length-the COAL will probably be shorter at say 3.475" and perhaps seated 1/3 way up the neck. Then send those empty cases with seated bullets to your smith and specify the distance off the lands you want to be. Using the example of the 3.500" with the TSX, if you specify .030" off the lands your looking at 3.530" to touch the lands and still hand a bunch of room in the magazine. BTW I'm not recommending you shoot TSX's .000 off the lands just using them for "measurement" purposes. 4. If you want to shoot 125-129 gr weights do the same measurements, but you'll likely not have much of the bullet seated in the neck due to their short length. 5. Spend a little extree money and use a good smith and a good barrel. I've tried to farm things out in the past and it usually doesn't work well.
Let us know what you decide and post some pics.
Good luck.
Almost forgot-Nolser's No. 3 reloading manual has velocities with 140 gr partitions at about 2900 fps. I'd bet with the 26" toob you'd be over 3000. Heap big medicine IMHO. <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
Here's a pic of what I was trying to describe. Same OGIVE over all length of 2.940"-cartridge is a 7x64 Brenneke. Four different bullets, cartridge OALs are obviously different as are the seating depths. Hope it helps.
6.5-06 or a 25 improved seems more logical now that I think of it. I like the idea of a 280 AI, but that is bigger than I need. the 6.5 is probably my best choice.
Good thought on brass being available and easy to make.
What does it mean when the primers fall out of the case?
Great bullet selection for the .264's. I just happen to think it's the cat's meow for anything short of elk. Then again, stick a 130 TSX in the right place and I'm sure it would keel over.
Pac Nor will not flute anything smaller than a #4 so the larger bore is favorable for lighter weight. Still deciding. Got to study the reamer listings more and then maybe ship out tomorrow.
What does it mean when the primers fall out of the case?
"Chamber with no throat" Means the reamer does not cut a throat section, instead, a throating reamer is used to cut the throat. Thus one may increase the throating options with a reamer. HOWEVER this is not the way to cut a match chamber, as the throat will not be totally concentric with the chamber section, a no-no for a precision rifle.
BTW correct spelling is throat, not throught.
Floating pilot reamers are the way to go, however, the person accomplishing the chambering must have a set of pilot bushings (the usual increment is 0.0002") in order to fit a snug pilot bushing to the bore.
Shipped off today. Looking to recieve a #1 26" in..............................................................nothin but a 280 AI <img src="/ubbthreads/images/graemlins/grin.gif" alt="" /> 3 groove cm barrel to be parkarized.
after all the debate on 25 or 6.5 a spur of the moment decision go bigger. Now for the wait. <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />
What does it mean when the primers fall out of the case?
280AI is my first choice. The long M700 action will take the 280AI cartridge with a 160 grain Nosler seated out where it belongs. Good Elk Medicine!! My 280AI reamer is throated for the 160 Nosler with the base of the bullet at the neck/shoulder junction.
A No. 1 contour is a little light for accuracy. OK for a mountain rifle.
280AI needs at least a 26 inch barrel to take advantage of the case capacity.
A few years ago I ran across over 1000 rounds of Remington factory loads in 280 Rem at a garage sale. Got the whole batch for $25. So I am set for life with fire forming fodder for the 280AI.
I have always been of the opinion that if a gunsmith can ream concentrically once, he can do it twice. In other words, if the setup is good enough to allow the reaming of a chamber which is straight and concentric with the bore then the seperately reamed throat will be likwise. If the throat and chamber are not well aligned with each other, it follows that one or the other of them is eccentric or misaligned in relation to the bore. If this is a major concern, it is just as likely the chamber cut with the reamer with integral throater is also eccentric or misaligned in relation to the bore. It makes sense that every step taken is an opportunity for an error to be introduced but I believe the cutting of a seperate throat is entirely proper, even for a match chamber, if the set up and execution is correct. I have cut chambers for my own BR and long range rifles both ways and have seen no discernable difference in accuracy and no evidence of any misalignment. Having said this, I certainly understand why a gunsmith might be more comfortable cutting match chambers with integral throater reamers. I only want to point out that to do otherwise does not mean the job is necessarily inferior.GD
