Okay, so what distinguishes a paper patch chamber from a non-paper patch chamber? I e-mailed Buffalo Arms asking for a recommendation for a bullet mold for paper patching my NEF Buffalo Classic .45-70, and they replied that my rifle doesn't have a paper patch chamber, and will doubtless always shoot grease groove boolits better.
On a related note, would it be possible to rechamber that barrel for say, 45-110, and cut a paper patch chamber?
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What you're looking for is a chamber that is almost exactly the length of the case, with no throat present. This way the bullet doesn't have to upset into the void present in a normal chamber and then get squeezed back down into the bore.
A "paperpatch" chamber will be tighter in demensions than what we commonly have now, it will also have a more gradual transition into the rifling, something on the order of 7degrees +- as compared to the 45 degree commonly cut in modern rifles whose primary use is probably going to be grooved or jacketed bullets and smokeless powder.
However that does not mean that you can't make a modern chamber shoot paper patch. You just need to go with bore diameter or slightly smaller, with not much of the bullet seated in the case, and sometimes thicker brass at the case mouth will help.
Probably if you started with a .441 bullet patched to .448, you can tell real quick if there's any possibility of your rifle shooting patched.
Long range rules, the rest drool.
The old rifles (as Don alluded to) had chamber dimensions which resulted in the brass case mouth being just right to accept a bore diameter bullet...after the case had been fired.Originally Posted by nicholst55
Modern chambers are about ten thousandths too big to get that result.
Recutting your chamber might barely work in obtaining those old dimensions at the mouth, but the reamer would have to be carefully designed, and the resulting chamber would almost have a bottleneck shape.
In addition, it might be real fun shooting a 45/110 in that lightweight rifle.
You might consider paper patching to groove diameter instead of modifying your chamber...
CM
Retired...TWICE. Now just raisin' cows and livin' on borrowed time.
you can also balance your powder charge, bullet alloy and powder granulation to get it to work just fine ,whatever bulet you choose.......
a standard chamber will not clean up bored out to 2 & 7/8 there will be a ring if you rechamber with a tight throat chamber of 470 .
you want the bullet to bump up when it is in the barrel if bore size ,groove or above you need a patch to make the transition to the barrel. you can also adjust brass thickness at the moouth to compensate,,,,,,,,,,,Dean
Last edited by powderburnerr; 04-15-2010 at 11:28 PM.
lover of 74 sharps
MYWEIGH scale merchant
" i'll tell the story 10 different ways before I'll lie to you."
Chamber cast of my 45-90
Nicholst55,
I did somehting a little different to get around the chamber problem you cite in my Pedersoli 1874 Sharps (which I happen to love, as my user name implies). Instead of modifying the chamber I had a bullet mold cut with a fairly heavy taper. The mold casts a boolit of 520 grains at 0.448 inches at the base and 0.442 inches at the shoulder. When patched up the size increases to about 7 thousandths more. This allows the boolit to be seated pretty far out in the case and deep into the chamber but big enough at the base such that it stays put with a taper crimp. Mind you, this is not so much a target boolit, although it gives fine accuracy but rather was designed primarily as a hunting boolit. Maybe this route will work for you, too.
SmileMaker.
What degree is the throat ?? and is that a throat you re cut or is it an original??
It looks close to what my .44-90 bn and .45-90 has.
Kurt
Kurt you'll have to ask Dan Zimmerman at DZ arms. He cut the chamber in
my Hepburn.
It's not important, maybe some day you could measure the length of the taper on your cast.
Kurt
Thanks for the info, guys; this has given me a lot to think about. I don't guess this whole paper patch thing is going to be anywhere near as simple as I had hoped. I think I'm going to look into having a one-off barrel made for my rifle with a PP chamber. Who makes chamber reamers to cut PP chambers?
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Any of the custom reamer makers will discuss chamber dimensions with you. Dave Kiff and Pacific Tool and Guage(White City, Oregon) is a good start. Get a copy of Precision Shootings Reloading Guide, there is a list of vendors for just about anything you want done.
Regards,
Bill
America is like a healthy body, and its resistance is threefold: its patriotism, its morality, and its spiritual life. If we can undermine these three areas, America will collapse from within. Joseph Stalin
"Hope" is not a strategy.
Life member NRA
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Both throats will work.
The only tough thing is getting a good paper and a lot of info has been posted on that subject.
Kurt
I don't think you need to spend the money on another barrel for your handirifle. The best thing to do is to get some bullets and get started wrapping them up and shooting, and see by trial and error what works and what doesn't.
Get a supply of bullets in .440- .446 diameter some 9# tracing paper, and start wrapping.After going thru all that and varying wad columns, lube cookies, lubed wads, seating depth etc, if you still can't make a patched load shoot as good as a grease groove, then maybe look into having some throat work done on the rifle. Don't forget fouling control comes into play along with powder selection.
But you need to remember those handirifles are decent guns value priced and will shoot fair at short to midrange, but if you want the best in the accuracy you need fixed barrels and standing breeches.
Long range rules, the rest drool.
It's true that there are chambers specificly intended for paper patching. It's also true that there are a lot of shooters using modern SAAMI chambers with paper patched bullets.
The object in any form of shooting is to get a symetrical, undamaged bullet out of the muzzle; spinning fast enough to be stable; and moving at a reasonable velocity.
In paper patching, getting the undamaged bullet is the part where a paper patch chamber may make the difference. It also depends on some other factors.
Here are two PP bullets fired from the same SAMMI chamber. One is 'damaged', the other is not. The trick is in learning how to get the result on the right all of the time.
A paper patch chamber will not auto-magically guarantee good results.
You still have to figure out how to do things right.
CM
Retired...TWICE. Now just raisin' cows and livin' on borrowed time.
It is very true that generally much powder and lead must be sacrificed at the target range altar to the accuracy gods before success. But is that not part of the fun?!!! Wahoo, I think it is!
More to think about... I've decided against another barrel for the Handi for a couple of reasons - one, like Don said, you are somewhat limited by the platform; two, I don't want to end up with a $1,000+ Handi Rifle! I'm sure a custom barrel (and reamer) would wind up being well north of $500 by the time I was finished.
I believe I'll shoot what I've got until I find myself being limited by the rifle, and then decide just what I want to do. A Shiloh Sharps would sure be nice, but it isn't in the cards at this time.
Actually, it's realistically going to be two more years before I can devote any effort to this project - that's when I'm scheduled to leave Korea. Maybe I'll save up my nickels and dimes and I'll be able to afford a Shiloh Sharps by that time.
Thanks for your input, fellas!
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Ya know if it's going to be two years before you get back from this tour... You may want to call the good folks at Shiloh and start the process, and by the time you get back your rifle will be ready.
Or start stuffing your pennies away and when you get back pickup an off the rack rifle, or one of C Sharps already mades.
Long range rules, the rest drool.
Good advice. My understanding is that the C. Sharps rifles have a 'modern' style chamber - is that correct?
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I guess we'ld need a definition of "modern" chamber, but yes they do , as does Shiloh unless you provide or specify a specific chamber reamer style to be used.
Either brand of rifle will shoot paper patch just fine, you just need to find the best combination, much like your BC most likely will with enough experimentation.
I may be mistaken, but I believe Kenny W's and Rick Mulherns shilohs all have standard chambers, and they shoot paper patch and greasegroove bullets with equal efficiency.
Long range rules, the rest drool.
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