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Hunting
Long Range Hunting & Shooting
How much do we really gain from the A.I. rifles.
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<blockquote data-quote="Capt RB" data-source="post: 1403700" data-attributes="member: 85987"><p>The 2 major reasons for improving a case are reducing pressure and improving case life. The pressure aspect works like this. The straightening of the case wall allows the case to expand out instead of back. Think of a pipe thread. This is a tapered thread that tightens as it is screwed in because of the taper. A standard bolt is straight and tighens when it comes to a shoulder or bolt head. Loosen a pipe thread and it becomes easier the further you unthread the fitting due to the clearance. Whereas a standard thread is the same diameter from 1st to last thead.</p><p> Now when you apply this to a cartridge case. As the pressure builds a case with a larger taper will have less grip on the chamber wall. This will cause the case to have more thrust to the rear. This will show up as you reach max pressure in your velocity. The reason is in the amount of pressure wasted to bolt thrust because the case did not grip the chamber walls as well as a straighter case would.</p><p> You also see much more stable brass as an improved case expands out instead back reducing case stretch</p></blockquote><p></p>
[QUOTE="Capt RB, post: 1403700, member: 85987"] The 2 major reasons for improving a case are reducing pressure and improving case life. The pressure aspect works like this. The straightening of the case wall allows the case to expand out instead of back. Think of a pipe thread. This is a tapered thread that tightens as it is screwed in because of the taper. A standard bolt is straight and tighens when it comes to a shoulder or bolt head. Loosen a pipe thread and it becomes easier the further you unthread the fitting due to the clearance. Whereas a standard thread is the same diameter from 1st to last thead. Now when you apply this to a cartridge case. As the pressure builds a case with a larger taper will have less grip on the chamber wall. This will cause the case to have more thrust to the rear. This will show up as you reach max pressure in your velocity. The reason is in the amount of pressure wasted to bolt thrust because the case did not grip the chamber walls as well as a straighter case would. You also see much more stable brass as an improved case expands out instead back reducing case stretch [/QUOTE]
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How much do we really gain from the A.I. rifles.
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