Seems like some folks spend a lot of time worrying about precise case and chamber length. If the chamber is overly long, I'd think about having it rechambered to a 45-100 and go from there. Those factory chambers with their free bores have been competitive in plenty of matches as is.

Bryan

Bryan your right. I been shooting my two .44 rifles one is a .44-100 Rem that has a 2.6 chamber and the .44-75 Ballard that has a 2.5" chamber and when I run out of the 2.6 shells at the range and I have 2,5 left I shoot them in the 2.6. The accuracy does not change shot in the 1/10" longer chamber.
A case that is right at chamber end is not a good thing, especially one that has a 45 degree transition. This has a tendency to pull the case neck up into the throat stretching the case or even possibly separate the necks. Just look at a fired case that is tight to the chamber end and see if the case mouth looks like it has a crimp after the shot is fired. I trim my fired cases .005-6" short.

Bryan did Casper the friendly Ghost drop any snow to green up your grass after doing the snow dance?????????

Kurt, we had a butt load of snow till early February. At that time the wind picked up along with the temps and it is almost gone below 6000 ft. Could be a dry spring if we don't get some soon.

Bryan

(02-29-2016, 11:42 AM)bryany Wrote: Seems like some folks spend a lot of time worrying about precise case and chamber length. If the chamber is overly long, I'd think about having it rechambered to a 45-100 and go from there. Those factory chambers with their free bores have been competitive in plenty of matches as is.

Bryan

Yeah, some folks. They shouldn't "spend a lotta time worrying about precise case and chamber length when the chamber is overly long, but they oughta rechamber to 100 and go from there." Makes a lotta sense. And "those factory chambers with their free bores have been competitive in plenty of matches as is"...What, w/o rechambering? LOL. Wonder if there's any chance they've fitted their brass? Nah, neither DanT, Kurt, Wayne, Semtav, nor all the others who size for w/i .005" know what they're doin. Some folks...Dunno what else I can say, but I'm pretty sure that when Kurt sizes down it's ok.

http://historicshooting.com/mybb/archive...369-5.html

So thanks for all the helpful observations, and thanks for the support Kurt. It's been swell everyone.

Doug you should know at this point Dan T and Bryan Y were good friends. You also need to know 1 lousy x at the 2014 Nationals kept Bryans name from being placed on the Castle trophy..He has the top shooter plaque from the Rocky Mtn. regional,, and I could go on, but I think by now you may understand that he is along with being one of the good folks, also someone whom it may pay to listen to..

I think you can do OK with a chamber that's a little long. My Browning BPCR is a pretty decent rifle and the chamber is quite a bit longer than SAMMI specs for a .45-70. I do cut down .45-90 brass for it however. Often you can get by with a grease groove at the case mouth to get around short brass.

The internet is a funny thing. Lots of folks post Iaowho, but there are a few to pay special attention to. I've shot with Bryan and I can tell you he is someone worth paying attention to :-). Plus he's a really nice guy, he's not going to lead you on a wild goose chase :-)

I do think that, chamber wise, there is not a whole lot wrong with a well cut custom chamber done by a good gunsmith though.

Chris.

The one thing I should add is this. When I first got into this stuff I found tons of differing opinions. Even among the experts. The important thing is that even though several accomplished shooters might disagree with a particular point, they have each developed systems that work well for them.

Chris.

I spent a lot of time for my own personal curiosity and working on solving bore leading and accuracy problems in one of my rifles.
Short brass can be a problem and is a problem that contributes to lead and accuracy changes especially in chambers that have the 45 degree transition into the lead. It makes no difference if it has any cylinder type of free bore or not ahead of the lead angle.
I have collected lead and paper rings after every single or multi shots. If you have a 45 degree chamber end you will have paper or lead rings even if the gap is .005" between the case mouth and the start of the 45. I do not get rings with my 7,5,4 or 3.5 degree chamber end using GG or PP bullets.
When wiping the bore after every shot fired this is not a problem because your pushing the ring out when you wipe with a damp and followed up with a dry patch. But using a blow tube you will have a ring, but this can be controlled by positioning a lube groove right in the gap ahead of the case mouth and the chamber end. The lube will make a solid fill in the gap when the shot is fired and from the looks from what I have looked at on the bullets no lead or paper is cut off as it starts to move into the throat as the bullet upsets in the chamber.
Take a close look at these rings. especially the long string on top. you can see a build up of several rings and that ring was made shooting a GG using a case .005" short of the chamber with the GG covered in the case.


Below is a bullet that was shot in cases .012" short. I did not wipe just used the tube. This bullet picked up a ring and it traveled on down range with the bullet. It left a deep impression on the ogive.
I deep seated these patched bullets to check a couple things. I also wanted to see how far the bullet moves when the charge goes off and how fast the bullet fully fills the chamber. You can see the case mouth ring on the left of the bullet about .008" above the bright ring of the lead that got shaved off the paper and shank as it got pushed across the chamber end making the paper ring.
The upset is very sudden from the looks even before the bullet starts to move.
A short case can do some damage to accuracy in a chamber that has a 45 degree transition into the throat from rings and lead smears.

I don't like to speculate why I don't get the accuracy out of my rifle, I look for the problems. We all have good and bad days at matches or just busting bowling pins or rocks.

Kurt my Shiloh in .40-65 gets those little lead rings shooting greasers. Maybe the thickness of a human hair or less. In that rifle I run my cases really close to the end of the chamber, maybe 0.002" away. The rings almost always stick to the extracted case mouth.

I wipe between shots and it's one of the most accurate rifles I've ever shot. It's a fine balance trying to completely get rid of the lead rings and not running the brass too long. Especially when you have a trimmer that works off of the back of the rim, and you have some rim thickness inconsistency.

Even so, I just live with the tiny lead rings and try to keep my brass about 0.002" short. Interestingly this is the only rifle I've ever noticed the rings in. But I'd pick it over every other rifle I have hands down, at least to 600 yards.

Chris.

Chris,
Breath, control, squeeze and follow through