Hornady OAL gauge for 243 AI

T

Tnslim

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Can I use a 243 modified case for a 243 AI or will I need to drill and tap an AI case? Hornady doesn't have an AI modified case.
 
OAL is OAL. Relationship with lands is the same. You'll be off by whatever headspace difference exists but that is always true with that setup.

- DAA
 
Originally Posted By: TnslimCan I use a 243 modified case for a 243 AI or will I need to drill and tap an AI case? Hornady doesn't have an AI modified case.

If you send them 2 fired cases, they will make you one. From their site:

"If your case is listed and you are needing a case modified, please follow the instructions listed below.

Please include contact information, two fired pieces of brass (not deprimed or resized, in case there are issues creating the modified case) as well as a check or money order for $15.00 for customers inside the USA. Please make checks payable to Hornady Manufacturing. We ask that you please use FedEx, UPS, or other direct shipping service. Using USPS may result in item returned to sender.


Please send to:

Hornady Manufacturing

Attn: Modified Cases

108 S. Apollo St.

Alda, NE 68810

*Please note we can only accommodate requests for those customers inside the USA, due to licensing regulations for cartridge cases."
 
I've compared OAL case guages made from fireformed brass to the generic ones Hornady sells, back to back, and in my experience, they weren't even close. The OAL case gauges made from brass that was shot in the chamber of the gun I'm using it on, obviously, fits up into the chamber perfectly and the generic one was loose in the chamber and was difficult to get repeatable OAL #'s

pahntr760 nailed it, they are very easy to make and IMO, using one made from a piece of brass that's been fired in that gun, is the only way to go.
 
For COL I dumped the Hornady and bought a Sinclair set up. It will do anything you want and no special cases. Of course you can do your own HS gauge just using a 7.62X39 or 7 Mag case on this one.

Greg
 
If you split a case neck with a thin dremel cut off tool, insert a bullet, you will get repeatable results to the .001 time after time. It will take some practice as when you first start out, you will leave the bullet too far out of the case, and it will stay in the barrel. SO, I put a cleaning rod in the barrel when I first start to knock the bullet out.
 
I use one of the Dremel stones and just take a little from inside neck to a tight fit but still push bullet to lands --
I went to tool supply house and ordered die and drill to match and make cases for all calibers-- one time cost --
Good luck --the 243AI will make a big difference in jump and pressures --
Thx
 
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Originally Posted By: ackleymanIf you split a case neck with a thin dremel cut off tool, insert a bullet, you will get repeatable results to the .001 time after time. It will take some practice as when you first start out, you will leave the bullet too far out of the case, and it will stay in the barrel. SO, I put a cleaning rod in the barrel when I first start to knock the bullet out.

That's exactly what I did for decades. Heck I even bought a jewelers saw for the task.

I used the Hornady for ten years and bought the drill and tap to make my own cases. I have maybe two dozen kf those custom done. Now with the Sinclair I have one case for each chamber and about fifty exemplar bullets so I get consistent measurements on my throats.

Greg
 
I just ordered the tap and drill bit from Amazon. I agree with using a fired case from the rifle you will be using. My Hornady cases for my other calibers are a bit loose so I figure a fire formed case would have to fit better and give more accurate readings.
 
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