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Long Range Hunting & Shooting
Effect of Bullet Spin on Terminal Performance
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<blockquote data-quote="Milepost" data-source="post: 1695039" data-attributes="member: 104022"><p>The terminal performance of a bullet is definitely affected be the spin rate. </p><p></p><p>Let's use the a 28 Nosler/195 EOL hybrid for an example.:</p><p></p><p>When Berger designed the 195 EOL it was designed for use on large deer species. Ideally, it needs an 8 twist to stabilize. The twist rate (rotational speed) also effects the time after initial penetration that the bullet fragments. Faster twist will fragment sooner and slower twists a little later. ( centrifugal force ) You can't expect a 195 to work on an antelope or coyote the same way as on an elk or moose.... IMO - That is what the 150-168 gr. bullets are for. Problem is that an old school 150 gr. bullet probably won't shoot very well out of 28 Nosler set up with an optimum freebore for the 195. ( unless you use a copper hunting bullet like the Hammers, CE, Barnes etc...) </p><p></p><p>Many complaints of poor terminal performance for any bullet usually are a from the mindset that one bullet can do it all and poor judgment of shot placement.</p><p></p><p>What you have to remember is what type of bullet you plan to shoot with and is it applicable to the size of game being hunted and finally at what range will most of hunting be at... Don't try to second guess the terminal effects of spin rate, The manufactures already did it for you long before they released the bullet for sale to the public. </p><p></p><p>Berger bullets are designed to fragment apart and disperse their energy in the chest cavity over a large area. A Nosler or Swift are designed to expand in the classic mushroom shape and spread their energy over a smaller area with possibly less meat damage. A Barnes mono bullet expands much like the classic partition and holds together at much higher velocities but the trade off is at lower speeds they don't expand well. Remember too that full copper bullets also expand at a slower rate when going thru game and will generally have better penetration but sacrifice that wide damage path like the Berger gives. </p><p></p><p>Those big DG African cartridges are made of brass, They are old designs that came about because lead core bullet designs of that time couldn't get the job done. A 30 cal lead bullet expands to .5" cal and a .375 expands to .6". So they designed the solids to be the expanded size of lead core and then kept adding length to get the penetration they needed to drop the type of DG game hunted. So the spin rate fore these are to stabilize the bullet but have no effect on terminal performance...</p></blockquote><p></p>
[QUOTE="Milepost, post: 1695039, member: 104022"] The terminal performance of a bullet is definitely affected be the spin rate. Let's use the a 28 Nosler/195 EOL hybrid for an example.: When Berger designed the 195 EOL it was designed for use on large deer species. Ideally, it needs an 8 twist to stabilize. The twist rate (rotational speed) also effects the time after initial penetration that the bullet fragments. Faster twist will fragment sooner and slower twists a little later. ( centrifugal force ) You can't expect a 195 to work on an antelope or coyote the same way as on an elk or moose.... IMO - That is what the 150-168 gr. bullets are for. Problem is that an old school 150 gr. bullet probably won't shoot very well out of 28 Nosler set up with an optimum freebore for the 195. ( unless you use a copper hunting bullet like the Hammers, CE, Barnes etc...) Many complaints of poor terminal performance for any bullet usually are a from the mindset that one bullet can do it all and poor judgment of shot placement. What you have to remember is what type of bullet you plan to shoot with and is it applicable to the size of game being hunted and finally at what range will most of hunting be at... Don't try to second guess the terminal effects of spin rate, The manufactures already did it for you long before they released the bullet for sale to the public. Berger bullets are designed to fragment apart and disperse their energy in the chest cavity over a large area. A Nosler or Swift are designed to expand in the classic mushroom shape and spread their energy over a smaller area with possibly less meat damage. A Barnes mono bullet expands much like the classic partition and holds together at much higher velocities but the trade off is at lower speeds they don't expand well. Remember too that full copper bullets also expand at a slower rate when going thru game and will generally have better penetration but sacrifice that wide damage path like the Berger gives. Those big DG African cartridges are made of brass, They are old designs that came about because lead core bullet designs of that time couldn't get the job done. A 30 cal lead bullet expands to .5" cal and a .375 expands to .6". So they designed the solids to be the expanded size of lead core and then kept adding length to get the penetration they needed to drop the type of DG game hunted. So the spin rate fore these are to stabilize the bullet but have no effect on terminal performance... [/QUOTE]
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