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Oal guage????

 
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  #1  
Old 03-18-2009, 02:15 PM
JEREMY logan
 
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Oal guage????

Who makes a cheap and accurate oal guage . I was also wandering if anyone has made a home made oal device? It seems like I once read where someone drilled out an empty hull and would use it to seat the bullet just off the lands. thanks for any advice.
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  #2  
Old 03-20-2009, 06:12 AM
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Re: Oal guage????

Stoney Point offers a kit with a drilled case, or you can drill out one of yours.

You can do the same measurement with a cleaning rod and calipers from the muzzle.
In this case you rest a cleaning rod against the boltface and mark it from the muzzle. Then press a bullet into the lands with a pencil or something, run the rod in to the bullet tip and mark the rod again(takes 2 people). Measure the marks and seat THAT bullet to THAT oal(head to tip). Put it in a drawer, as thats your standard for future measurement comparisons.
Oh yeah, you'll need to sacrifice a cheap rod tip, and make it a flat(to stop at bullet tip), for this purpose.
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  #3  
Old 03-20-2009, 08:12 AM
JEREMY logan
 
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Re: Oal guage????

Thanks for the reply and advice i'll try that until i buy a stoney point.
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  #4  
Old 03-20-2009, 08:13 AM
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Re: Oal guage????

I bought several of those Max OAL measuring devices. Have returned to the use of a rod, as Mike describes. It's easy to do alone IF you have a gun cleaning vise to secure the rifle in.

Hardwood dowel rods in the right diameter are better than a cleaning rod, IMHO. I have one for each bore size I need, sanded smoooth and given a couple of coats of polyurethane to seal the wood against oil and make it easy to wipe clean.

It's impossible, in a strict sense, to mark (with a knife blade) the rod precisely and then to read it precisely, I mean withing a thousant or two, but that's really not neccessary for what we need to do.

Few factory sporter rifles shoot their best ON the lands, most shoot best from .025" to as much as .125" off the lands.

There is, usually, a range of seating maybe .015" wide that the gun won't see any difference in. I find and seat in the middle of that range and never worry about a few thousants of "error" one way or the other. I suspect that seating on the ragged edge of that range is at least a part of what causes flyers.
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  #5  
Old 03-20-2009, 08:37 AM
JEREMY logan
 
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Re: Oal guage????

Thanks boomtube, I have a rem. 700 sendero with hs precision stock DE recoil lug and heavy contour broughton 26'' barrel I plan on shooting 210 grain bergers. OH the barrel is 100% free floated. MY question is, the tip of the bullet does not touch the lands so how do you take that in to account to get the correct measurments ? Sorry if this question seems silly but you don't now if you don't ask
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  #6  
Old 03-20-2009, 10:55 AM
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Re: Oal guage????

Good point. The measurement to tip is only for THAT bullet, for initially making THAT standard.

Stoney Point also offers Caliper Comparator Inserts for measuring head to ojive(somewhere close to land contact point on the bullets). I use a comparator nut offered by Sinclair for this.
It works better.

You compare this measurement to that off the 'Standard' cartridge made above, for adjusting your seating die to whatever OAL-to-Ojive(for lack of a better term).
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  #7  
Old 03-20-2009, 12:18 PM
JEREMY logan
 
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Re: Oal guage????

Thanks for the reply MIKECR, I watched a video by ammosmith were he took an old hull and drilled out the back of it and uses an old cleaning rod to push the bullet into the lands then he ejects it out very carefully and measures from the land marks on the side of the bullet to the base . Looks like that could work also .
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