making a modified case for 30brs

[the long shot]

Slowly I am making brass for my 30Br rifle. I think I have properly turned, sized, and sorted brass for my rifle. I am now trying to determine the ogive OAL measurement. In the past I have had a standard cartridge in modified case to go on my hornady tool. Hornady does not have a modified case for 30BR. Is there a good way to make the case to determine where the lands are?

I am open for suggestions. I though that maybe slitting the neck with a dremel tool to let the bullet slide a bit may be my best bet but I am worried the brass won't chamber right.

 

[NorCalMikie]

If you're able to expand the 6 BR to 30 BR, you're half way there.
Take one of your expanded neck cases and send it to Hornady. Let them do the rest.
They do .308 so the inside of the neck would be the same for your 30 BR?
I had them do a 6.8 BR Wildcat case. Same as a .270 neck. ;D

 

[tightneck]

No special tools needed to find the lands...all you need is the rifle, your standard loading tools, and a piece of steel wool. Use a bushing that's about .003" under your loaded rounds diameter. Seat a bullet long, making sure that when you close the bolt (stripped of the FP assembly of course) on the dummy round, the bullet is pushed back into the case by the rifling. Using some kind of comparator, take a measurement of the loaded round. This is your "jam" length. No matter what, you can't seat the bullet further into the lands. Now, you can make any adjustments from there. I use the steel wool to see what kind of mark the lands leave on the bullet. Polish the bullet with the steel wool and then chamber the dummy round. You'll see very distinct marks on the bullet. Seat the bullet back into the case a few thousandths at a time, checking the marks on the bullet as you go. You'll eventually run out of marks. You'll find in time that the point where the bullet is just touching the lands is just as important (or more) than full jam. Most 30BR barrels that I've dealt with like the bullet to be into the lands from .005" to .010" from the just touching point. Good shooting...

 

[Killshot]

You can pretty simply make a Modified Case yourself from a 6BR case that you've necked up.

Just drill out the center of the casehead using a 19/64ths drill bit and tap it with a 5/16th by 36 tap.
You can order tap from Hermanscentral.com. Part# DRI-DWT5/16-36. $12.95 plus shipping.

Quicker than waiting for Hornady and I think a better way than using a split case or soft-seating.

 

[jasonf]

You can pretty simply make a Modified Case yourself from a 6BR case that you've necked up.

Just drill out the center of the casehead using a 19/64ths drill bit and tap it with a 5/16th by 36 tap.
You can order tap from Hermanscentral.com. Part# DRI-DWT5/16-36. $12.95 plus shipping.

Quicker than waiting for Hornady and I think a better way than using a split case or soft-seating.

+1. Even better if you use a case that has been fire formed for your chamber.

 

[25AI260]

how'bout just using your cleaning rod....? close the bolt on your gun stick in the rod against the bolt face an make a mark on the rod at the muzzle

then make an oversized dummy an put in the action just tight enough agaist the land... an

then push the rod in.. to the bullet tip an make another mark at the muzzle on the rod... an

then measure that distance between the two marks an make dummy to that OAL

then you can read the ogive of that bullet... that would be your kiss length for that bullet

just be'n cheap... it works though

 

[bozo699]

how'bout just using your cleaning rod....? close the bolt on your gun stick in the rod against the bolt face an make a mark on the rod at the muzzle

then make an oversized dummy an put in the action just tight enough agaist the land... an

then push the rod in.. to the bullet tip an make another mark at the muzzle on the rod... an

then measure that distance between the two marks an make dummy to that OAL

then you can read the ogive of that bullet... that would be your kiss length for that bullet

just be'n cheap... it works though

Yes this method works but if your trying different bullets and you have multiple chamberings it is a PITA so the Hornaday tool is cheap and so is a drill bit and a tap and you can make as many dummy rounds as you please, it is the route I went when I had to wait for hornaday and I am not a patient person.
Wayne.

 

[Nomad47]

Just ordered the tap so I can make a Modified 6XC case. But Killshot's part number didn't work. Oh, and shipping was more than tap and drill bit.

 

[bozo699]

Just ordered the tap so I can make a Modified 6XC case. But Killshot's part number didn't work. Oh, and shipping was more than tap and drill bit.

And now you get to drill and tap the case. If you have a drill press or lathe, the appropriate Wilson case holder, a can of Tap Magic and some newspaper it's easy. Using a hand drill and tap wrench is more of a challenge.

And once you get all the equipment and have done a few don't tell anybody or you'll have a new part time job that doesn't pay anything 'cause it looks so easy.

100% spot on Dave.

 

[Nomad47]

Just ordered the tap so I can make a Modified 6XC case. But Killshot's part number didn't work. Oh, and shipping was more than tap and drill bit.

And now you get to drill and tap the case. If you have a drill press or lathe, the appropriate Wilson case holder, a can of Tap Magic and some newspaper it's easy. Using a hand drill and tap wrench is more of a challenge.

And once you get all the equipment and have done a few don't tell anybody or you'll have a new part time job that doesn't pay anything 'cause it looks so easy.

100% spot on Dave.

I live in a motorhome, so its going to be at the "more of a challenge" end of the spectrum.

 

[bozo699]

Just ordered the tap so I can make a Modified 6XC case. But Killshot's part number didn't work. Oh, and shipping was more than tap and drill bit.

And now you get to drill and tap the case. If you have a drill press or lathe, the appropriate Wilson case holder, a can of Tap Magic and some newspaper it's easy. Using a hand drill and tap wrench is more of a challenge.

And once you get all the equipment and have done a few don't tell anybody or you'll have a new part time job that doesn't pay anything 'cause it looks so easy.

100% spot on Dave.

I live in a motorhome, so its going to be at the "more of a challenge" end of the spectrum.

Bill,
If you have problems, I don't think you will but if you do stop by any little machine shop or job shop and tell them what you need, blow a little smoke up there back side and they might even do it for free but if not maybe not to much. I know you have a lot of friends scattered across the states, when traveling stop by and ask one of them to give you a hand
Wayne.

If you make it this way I will do it for a small fee,.............................a cup of coffee and a good b.s session ;D

 

[dirtworks5]

Sinclair makes a very simple tool for around 35.00. It works very well for any caliber all you need is your bullet and a piece of fired brass with the primer. Very simple and no need for any modified cases.
Good shooting,
Vern

 

[Nomad47]

LOL, Wayne. I can handle the cup of coffee and a loooong BS session. But I hope to make my modified case long before I get to your neck of the woods.

 

[Nomad47]

I got invited to shoot on a local ranch, so I took my 284 Win and my unfired 6XC. I stopped at the RV park office on my way and, lo and behold, my tap & drill bit had just arrived.
My first shot out of the 6XC was with a 22-250 case re-sized to 6XC (funny looking case, eh?). So today I wanted to make my modified case. I clamped the converted 22-250 fired case with vise grips after knocking out the spent primer, then clamped the vise grips to a picnic table with a C clamp. It didn't come out perfectly straight but close enough to work. I also found out (using the new modified case) that my first loads were not .020 off the lands as I expected but .003 into the lands. Which also explains why I was getting flattened primers on four of the five loads.

 

[Killshot]

Glad you got one made up. Best to have the right tool for the job. Sorry 'bout the part number not working for you. Took it right off their website.