Changing Length of Gas Tube

Changing Length of Gas Tube

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Also, I am using the standard length gas tube. Long before one gets in trouble with high pressures, the Carbine gas block/tube/port position, opens the action way too soon and you’ll start to rip the rims off or the action won’t open at all, because the cases haven’t released from the chamber yet. So, I remove the Dissipater gas tube and spin the gas block 180 degrees, reset the set screws, the Dissipater gas block now blocks the carbine length gas port, then I install the rifle tube with a new gas port, and bingo, back in business for load development and the Dissipater gas block, turned 180, does not interfere with the rifle gas tube at all…

By admin on October 24, 2009 | Uncategorized | A comment?
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How to Modify a Lee 45-70 Gov’t Factory Crimp Die

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I modified the 45-70 die to get a smaller crimp. Popped the crimp collar out, stuck it in the lathe and trimmed the crimp “bump” back ’till it gave me the crimp I wanted.

The un-modified crimper.

The modified crimper.

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Quote:
Originally Posted by BD1 View Post
Slash, My Lee 45-70 FCD arrived today. How did you get the collet out of the die to shorten the crimping section?

BD

I chucked the end of the collet that sticks out of the housing up in my lathe so that the housing was smack up against the jaws of the chuck, then I screwed the nut that is on the housing tight against the chuck jaws. Further tightening will force the housing away from the chuck and off of the collet.

If you don’t have a lathe you could use a vise with a couple of chunks of wood to protect the collet end. Or vise grips, a C clamp, somebody with a really string grip, you get the picture.

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I just put the die in my reloading press and punched the collet out with a proper fitted wood dowel. It is just a snap ring that holds it in.

Magazine Capacity Increase

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I took apart some 5 round 450b mags last night and cut the spring to leave one full coil at the bottom and they will hold 7 rounds. It was necessary to stretch the spring some to extend 2 1/2″ – 3″ above the mag body before installing the bottom plate to provide sufficient pressure to lock the bolt open after the last round; however, loading and feeding felt better after replacing the spring with a standard 20 round magazine spring.

I also discovered that 20 round BMI 5.56 mags with the grey no-tilt follower will hold 7 rounds and feed fine in my rifle without the single shot follower.

By admin on October 22, 2009 | Uncategorized | A comment?
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Lengthening the Gas Tube

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Now you’re getting it. Nice, and detailed pics too! My side crimp ideas needs may need a little tweaking. Beings you have the where for all to machine a “Lee Factory Crimp Die” it looks like the crimping from top to bottom is wide. Take the floating sleeve out and make the crimp narrower, to better enter the crimping groove in the bullet, this will make for even a better crimp, like maybe 5/6 whacks. Looks like the crimp is a little heavy too, but you might better wait and see, I’ve seen worst and they had prefect accuracy. Now this is for, if you really want to tweak, because all things, just might be wonderful the way you’ve go it now and it might be better if you tried it out, then if all goes south, then tweak, but for sure you are on the right track. I’ve used this method for many long years, and this side crimp is used on Cannon shells now. Something else to look for, you guys are starting to get into some real performance and you are going to lite-up the week of heart, hand ringers, and scare the Pigs, Deer, and Moose to death. The intermediate gas block, with the carbine length gas tube, will eventually need to be by-passed and a rifle length gas tube (10/15 $bucks) installed, to the front sight gas block. Of course a Pig tail Gas tube (way easier but 70/80 $bucks) could be used in the original gas block. You’ll know if when shooting single shots, with the magazine in the weapon (which you should have already been doing) and the bolt wont any longer stay open after the shot. That will be, because the case is still sealed into the chamber and the bolt is trying to open, you also may see extractor marks in the case extractor grove. Before when you guys were doing the single loading with the magazine in, you where short stroking, because of not enough pressure. Soon you’ll see the bolt not opening, not because of too much pressure, but because of to Soon, the pressure, hence needing the longer gas tube. Not to worry though, we’ve got good and cheap, easy to do fixes for that. It’ll be like wanting to install a blower on your already super fast Vette, she’ll go much faster now!! But as always, watch for excessive pressures, all the way through this process. That 275 Barnes is going to be a real Barn(s) Burner..

By admin on October 19, 2009 | Uncategorized | A comment?
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Side Crimping, Part 2 with a Modified Lee Die

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Here’s another style of crimp. This too will stop bullet creep dead in its tracks, its a type of side crimp. After you’ve pretty much decided which bullet you like most or the trade-offs you are willing to except, you can have Lee Dies; make up a Lee Factory Crimp Die that crimps well south of the case mouth, just like the side crimp I use (your going to have to tell them how far south on the case you want it and how much crimp is required, hey, this is all custom stuff here). Or, I bought a Factory Crimp die for the 45-70, cutting off the base of the die and shortening that crimp plunger do-dah (heck I don’t know what they call it?), this let the case go well above the top of the die, before the crimping action took place, which then placed the side crimp way down the case, where I wanted it anyways. This is very slick and quick for reloading and much less time consuming than the chemical bonding. Of course, this will require some minor machining.

Safety First…t

By admin on October 18, 2009 | Uncategorized | A comment?
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