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Meplat trimming & bullet tipping?

 
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  #8  
Old 04-10-2011, 06:44 PM
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Re: Meplat trimming & bullet tipping?

The reason I started this thread is because I have shot 5 shot groups at 400 yds as small as 1.5" and 1.75" but not consistent, but my average the other day was larger. I shot five 5 shot groups which measures 2.0", 2.375", 2.375" 2.25" and another one that was 1" for four shots and one flier which gave the group a total measurement of 2.25".

I was hoping that if I did trim the meplat and tipped the bullets I could get more consistent groups down under 2 inches. For me that is a lot of $$$ if it probably won't help.

What do you think?

joseph

PS: I am shooting a 6mm Norma BR. with 105 gr. Berger VLDs, CCI BR4s and Varget just touching the lands.

Last edited by joseph; 04-10-2011 at 06:48 PM.
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  #9  
Old 04-10-2011, 07:28 PM
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Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by elkaholic View Post
You can enhance the expansion of an SMK by drilling the tip out 1/2 the meplat diameter and filling the void with silicone......Rich
How do you do that and keep them all the same? How deep do you drill them out? Interesting since SMKs are what I shoot.
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Old 04-10-2011, 08:31 PM
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Re: Meplat trimming & bullet tipping?

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Originally Posted by CRNA View Post
How do you do that and keep them all the same? How deep do you drill them out? Interesting since SMKs are what I shoot.
You need some kind of vice to hold the bullet consistently without deforming it. Drill just through the jacket and not into the lead. You will have to experiment to get the depth right. Once you do, drill to the same depth each time. Fill the void to the tip with silicone. The weight should not be much different than before drilling. If the bullet still doesn't expand to your liking, use a slightly larger bit size. The idea is to thin the jacket nose and the silicone will start the expansion of the tip as well as replace the weight and smooth things up a bit......Rich

Last edited by elkaholic; 04-10-2011 at 08:35 PM.
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  #11  
Old 04-10-2011, 08:33 PM
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Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by elkaholic View Post
You need some kind of vice to hold the bullet consistently without deforming it. Drill just through the jacket and not into the lead. You will have to experiment to get the depth right. Once you do, drill to the same depth each time. Fill the void to the tip with silicone. The weight should not be much different than before drilling. If the bullet still doesn't expand to your liking, use a slightly larger bit size.....Rich
Thanks!
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  #12  
Old 04-11-2011, 07:41 AM
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Re: Meplat trimming & bullet tipping?

I just now found this most interesting article by Byron Litz re meplat trimming. It reinforces my thinking on the subject.

Homepage of Bryan Litz - A Bravenet.com Hosted Site
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Old 04-11-2011, 09:50 AM
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Re: Meplat trimming & bullet tipping?

Quote:
Originally Posted by Gene View Post
I just now found this most interesting article by Byron Litz re meplat trimming. It reinforces my thinking on the subject.

Homepage of Bryan Litz - A Bravenet.com Hosted Site
VERY good read! I found this to be true when I tested some of my bullets WITH and WITHOUT, ballistic tips. They were 195 grain .308 8s spitzers. The original meplat was as tight as I could squeeze down my dies. I didn't measure the meplat at the time (wish I would have) but it was considerable, probably over .100"? I then added a sharp pointed tip and fired away at 950 yds. The difference in group height was over 20"! Made a believer out of me.......Rich
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  #14  
Old 04-11-2011, 12:42 PM
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Re: Meplat trimming & bullet tipping?

I have shot more 142 SMK’s than Brian Lutz will ever shoot and for the most part I agree with what he said. The point up die I use (Speedy built it) is more effective that just trimming the Meplat in my experience. Vertical is BAD for 1K BR shooters and I prep my bullets for sporters the same way IF they are going to be used primarily at 500 yards or more. Just like sorting bullets by bearing surface for sporters---I like to use the same process every time because the sporters are built the same way and the same person who builds my competition rifles. I makes sense that if my reamer cut the chambers for both the sporter and competition rifle and the dies were also made with the same reamers then there will be very little variable in my loading process which is a good thing.

The biggest benefactor in trimming Meplats that I personally have found is the big 338 SMK’s. In my 338 Slowpoke it made a 4-5 inch difference in vertical ---- I only take off the very Minimum necessary because as Brian discussed BC is important. THE MOST important thing is consistency in your process which includes ammo to bag manners so that the end item product will be the same every time---a hit, albeit an x ring or a prairie dog LOL!!
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