DIY Hornady modified cases - 2CoolFishing
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Old 01-07-2019, 12:49 PM   #1
muney pit
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DIY Hornady modified cases

The wife got me the hornady c.o.l gauge for christmas. I got tired of using a cleaning rod and tap. Anyway i thought id give a go at making my own since each one is nearly $10. Doing the a 308 and 6.5 c.m case paid for the die anyway. The hardest part was finding the 5/16×32 tap. I ended up just ordering it from amazon. I tried 2 home depot and a local hardware store and no one had it. I tested on a 223 case and it came out ok. The main issue i have is not letting the case spin in the vice. To much pressure and you egg shape the case, not enough and it spins. The last one i did i used a pair of channel locks to help hold it and that did help alot. So if you guys wanna do your own just know your probably gonna have to buy the tap online.
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Old 01-08-2019, 08:10 AM   #2
bearintex
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Chuck the case up in an extra drill, then grab the drill chuck in your vise.
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Old 01-08-2019, 10:40 AM   #3
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Nice write up.


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Old 01-23-2019, 04:59 PM   #4
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I have been making my own but I am fortunate to have a lathe. The tap from Amazon does a real good job and the only store that might actually have one would be Fastenal and you would most likely have to order it anyway. Another advantage of making them yourself is you can use the fire formed brass out of your chamber and can figure the headspace a little more accurately than an unfired case. There is a procedure to fire form correctly especially when you are forming for a wildcat cartridge but I just usually use a once fired brass out of the rifle I load for. I have never gone through the full procedure for standard calibers although there are folks that do it. Keep the sizing down to a minimum and you get to use your brass until the primer pockets give up if you anneal the necks.
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Old 01-26-2019, 07:43 AM   #5
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Over all length doesn't seem to be a definite number to me since the shape of the bullet affects when it touches the rifling. So, do you use the specific bullet in question to measure with?
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Old 01-26-2019, 11:51 AM   #6
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Quote:
Originally Posted by Whitebassfisher View Post
Over all length doesn't seem to be a definite number to me since the shape of the bullet affects when it touches the rifling. So, do you use the specific bullet in question to measure with?
Absolutely. A eld will have a way different ogive than say a roundnose.
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Old 01-27-2019, 10:21 AM   #7
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Ogive

Here's a tip I do. When I get a new box of projectiles I rig up the Hornady dipstick or whatever you call it with the appropriate modified case and use that specific bullet and do the measurement to where it contacts the riflings then record that number on the box. That gives you a record of where zero jump is. If you have multiple rifles in the same caliber that's a separate log you need to keep. And keep in mind different lot numbers of the same bullet might be slightly different so it doesn't hurt to recheck the zero measurement. Even the best projectiles vary in the same lots but most of us don't have a measuring instrument that can measure it. Plain old dial calipers are good for about .001 to .0005. A quality digital will get you closer and unless you are a bench rest shooter a half thou doesn't hurt you much. The really serious guys use a different method that doesn't involve the Hornady or similar tool that requires some disassembly of the bolt. Splitting hairs when you get to that level.
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