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Reloading
Bullet Question?
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<blockquote data-quote="Fiftydriver" data-source="post: 156229" data-attributes="member: 10"><p>1. Its not coated but it has been treated on the surface with a chemical that oxidizes the jacket to make it black in appearance. It is said this helps harden the jacket surface to reduce bore friction, I have not see that this works or reduces bore fouling over a standard BT but it may.</p><p></p><p>2. Your case life will tell you if your running to much pressure. Is this a 7mm Rem Mag of 7mm Ultra Mag? I assume its a Rem Mag if your using 70 grains of powder but you listed your round as a 7mm UM???? </p><p></p><p>Watch for normal pressure signs such as increased effort to lift bolt, overly flattened primers, possible firing pin cratering on primer or extractor marks on case heads after firing. Any one of these by itself is not really a true indicator that your pressures are to high but it could be.</p><p></p><p>3. In any high performance magnum round, it is not really smart to only neck size with top end loads. The reason is because once you get into magnum sized rounds, there is enough surface area on the case to grip the chamber very tightly. If you do not reduce the size of the case after firing you will get stick extraction.</p><p></p><p>I recommend partial FL sizing of the case, just enough so that you size as much of the case as possible without bumping the shoulder position on the case. Just to be sure, its best to check your sized cases by chambering them in your rifle before loading the case up. It should chamber easily with at the most a very slight resistance when you close the bolt, just enough to be able to tell there is a case in the chamber is all you want. If the bolt is harder to close then this, you need to size your cases more.</p><p></p><p>If your sized cases chamber easily, then its either a rough chamber issue or your running higher pressures then you should be.</p><p></p><p>4. That bullet will work great out to 500 yards on any whitetail. 3500 fps, we really need to know what chambering your shooting. If its a Rem Mag, your pushing things hard if your getting this velocity in a standard length barrel. If your using the RUM then your about right with very top end loads but the powder charge seems light to me.</p><p></p><p>If your running the RUM, there are much better powders out there for you to use such as Rl-25, H-1000 and Retumbo.</p><p></p><p>The 140 gr Accubond would in my opinion be a much better bullet then either the Ballistic Tip or Ballistic Silvertip. It will open up just as easily at long range, have the same BC, generally shoots identically to the other bullets but has the bonded core for higher weight retention for closer range shots or impacts on heavy bone. </p><p></p><p>Again, In my opinion, there is no comparision between the Accubond and the others, the Accubond is a far better choice.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 156229, member: 10"] 1. Its not coated but it has been treated on the surface with a chemical that oxidizes the jacket to make it black in appearance. It is said this helps harden the jacket surface to reduce bore friction, I have not see that this works or reduces bore fouling over a standard BT but it may. 2. Your case life will tell you if your running to much pressure. Is this a 7mm Rem Mag of 7mm Ultra Mag? I assume its a Rem Mag if your using 70 grains of powder but you listed your round as a 7mm UM???? Watch for normal pressure signs such as increased effort to lift bolt, overly flattened primers, possible firing pin cratering on primer or extractor marks on case heads after firing. Any one of these by itself is not really a true indicator that your pressures are to high but it could be. 3. In any high performance magnum round, it is not really smart to only neck size with top end loads. The reason is because once you get into magnum sized rounds, there is enough surface area on the case to grip the chamber very tightly. If you do not reduce the size of the case after firing you will get stick extraction. I recommend partial FL sizing of the case, just enough so that you size as much of the case as possible without bumping the shoulder position on the case. Just to be sure, its best to check your sized cases by chambering them in your rifle before loading the case up. It should chamber easily with at the most a very slight resistance when you close the bolt, just enough to be able to tell there is a case in the chamber is all you want. If the bolt is harder to close then this, you need to size your cases more. If your sized cases chamber easily, then its either a rough chamber issue or your running higher pressures then you should be. 4. That bullet will work great out to 500 yards on any whitetail. 3500 fps, we really need to know what chambering your shooting. If its a Rem Mag, your pushing things hard if your getting this velocity in a standard length barrel. If your using the RUM then your about right with very top end loads but the powder charge seems light to me. If your running the RUM, there are much better powders out there for you to use such as Rl-25, H-1000 and Retumbo. The 140 gr Accubond would in my opinion be a much better bullet then either the Ballistic Tip or Ballistic Silvertip. It will open up just as easily at long range, have the same BC, generally shoots identically to the other bullets but has the bonded core for higher weight retention for closer range shots or impacts on heavy bone. Again, In my opinion, there is no comparision between the Accubond and the others, the Accubond is a far better choice. Kirby Allen(50) [/QUOTE]
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