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243cal reloading need help

 
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  #8  
Old 07-16-2012, 08:45 AM
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Re: 243cal reloading need help

Does anyone know the twist for sure on a 243 vtr? 1-10 or 1-9 1/8?
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  #9  
Old 07-16-2012, 09:04 AM
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Re: 243cal reloading need help

Quote:
Originally Posted by Rem700 View Post
I believe Berger recommends a their 87gr for your 1:10 twist.
the remingtons have a 9 1/8 twist. i was never able to get good groups with the berger 95 out of my buddies' vls. try 87 or 88 bergers , 85 sierra, 87 hornady.
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  #10  
Old 07-16-2012, 12:22 PM
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Re: 243cal reloading need help

Quote:
Originally Posted by backwoods83 View Post
Try seating 5 rounds .010" in the lands, 5 .010" off the lands, and 5 .040" off the lands using a 40grn charge of Imr 4350, see which 5 group the tightest and make small seating depth adjustments, then work on getting your velocity, es, and sd up to par.
I have seen this before and don't understand what it means: "in the lands"

In my conception of distance of bullet to lands you are either touching the lands, in which case the bullet can't be moved any further forward, or you are "off the lands", meaning the distance from the lands to the the part of the bullet ogive that would touch the lands if you pushed it forward til it stops.

I use a Hornady OAL guage to determine the OAL required to touch the lands for a given bullet. Once I have the "touching length", I back it off as much as I want until I find an optimum length for accuracy.

Am I missing something here?
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  #11  
Old 07-17-2012, 05:44 PM
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Re: 243cal reloading need help

Ya I'm new to all this in the lands back off the lands .10 etc talk the way I measure is take a shot case before resizing and put a slight dent in the neck and color the bullet black and put it in the neck of the case and chamber the round and then measure the over all length but I've yet to back off the "lands" and load one and shoot it but if I want to shoot thes bergers I guess I'm gonna have try it
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  #12  
Old 07-17-2012, 08:25 PM
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Re: 243cal reloading need help

If your gun is a 1 in 9 1/8 twist then the 95s are on the edge of performance, some will some won't. But if you want to shoot bergers the 87s are about perfect. I have a savage with a 1 in 9 1/4 twist ( I think) that wouldn't shoot the 95s at all. I bought some 87s, and wow, big difference. They shoot good at a wide range of charges.

But like roninflag said a lot of the 80ish grain bullets should perform better than the 95s in that twist. When you find a bullet and charge that shoots respectable, THEN try experimenting with different seating depths. On that note an O.A.L. Gauge is a valuable tool for measuring seating depth and not too pricey. The hornady loc-n-load gauge is about 30.00 with the basic comparator set ( good for a bunch of different calibers) is around 25.00. Well worth the money if your reloading.

" In the lands"---meaning you push the bullet into the rifling (lands) when you close your bolt. Without a O.A.L gauge it's really hard to cut even .020(twenty thousandths) so I would stay on or better yet,just short of the lands for safety purposes.
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  #13  
Old 07-17-2012, 10:42 PM
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Location: Gillette, Wy
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Re: 243cal reloading need help

I use the 87. My daughters gun shoots the 105 Amax very well with a 1 : 9 twist.
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  #14  
Old 07-17-2012, 10:47 PM
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Posts: 241
Re: 243cal reloading need help

Make 2 vertical slots in the neck of an empty brass, put the bullet in. Then chamber it, carefully eject it, measure it, that's the length you need to get it to the lands, adjust from there.
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