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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
25 STW
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<blockquote data-quote="Fiftydriver" data-source="post: 35614" data-attributes="member: 10"><p>Daveosok,</p><p></p><p>IF you are very consciencious of your shooting and keeping the barrel cool and clean, the 257 STW will provide at least 1000 rounds of quality accuracy life and some have reached 1500 rounds.</p><p></p><p>THis is a very short life for a varmint rifle but for a long range or big game rifle, it could be a lifetime of use.</p><p></p><p>Key is to take very good care of your barrel and use a quality barrel in stainless steel to begin with.</p><p></p><p>Your friend that wants 3800 fps with a 140 gr 6.5mm bullet is in my opinion dreaming a bit. Rounds like the 6.5 STW will deliever 3300 fps with long barrels with the 140 class bullets and any case much larger then this really does not offer alot more velocity in this caliber.</p><p></p><p>If by chance he could get the velocities this high, there is no match quality VLD on the market that would survive such a launch. </p><p></p><p>Well, the Wildcat bullets that Richard Graves builds may handle this as he can build bonded core long range designs but I have never heard of a 6.5 round that would drive this bullet weight this fast.</p><p></p><p>Other then that you would have to shoot either a Partition, X or some of the exotic solid alloy bullets and even these would be strained at 3800 fps.</p><p></p><p>Most match bullets will top out in the 3200-3500 fps range for peak accuracy and most calibers will be in the 3200-3300 fps range. </p><p></p><p>Again tight moa groups are far more important then hyper velocity.</p><p></p><p>I have seen accuracy come at low pressure/velocity levels and at pressures I would consider on the ragged edge of safety. It all depends on the rifle, the bullet and enough other factors to sink a ship.</p><p></p><p>If I were you I would keep your STW until you burn the barrel out. It is true the 7mm RUM is a larger case but not by the as much as you think. You may be able to get 20 more grains of ultra slow burning powder in the case but youwill get about 150-175 fps more velocity and not the 300 fps you are expecting.</p><p></p><p>In conventional rifles(26" barrels) the RUM will average 125 fps over the full length standard belted magnum rounds of same caliber.</p><p></p><p>Likewise, the 300 RUM will come within 125 fps of the huge 30-378 Wby with 180-200 gr bullets.</p><p></p><p>True with longer barrels the big Wby will gain more of a velocity edge but not more then 200 fps in my testing.</p><p></p><p>Still this is a major increase in performance but sometimes more then match bullets can handle.</p><p></p><p>IF you have guys wanting to use match VLD bullets in big cased rounds, remind them that these bullets have velocity limits and make sure they know this before they spend $3000 on a rifle that will drive a 140 gr bullet to 3600 fps but will only be accurate when driven to 3300 fps.</p><p></p><p>Been down that road early in my career and its no fun trying to explain things after the fact.</p><p></p><p>GOod Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 35614, member: 10"] Daveosok, IF you are very consciencious of your shooting and keeping the barrel cool and clean, the 257 STW will provide at least 1000 rounds of quality accuracy life and some have reached 1500 rounds. THis is a very short life for a varmint rifle but for a long range or big game rifle, it could be a lifetime of use. Key is to take very good care of your barrel and use a quality barrel in stainless steel to begin with. Your friend that wants 3800 fps with a 140 gr 6.5mm bullet is in my opinion dreaming a bit. Rounds like the 6.5 STW will deliever 3300 fps with long barrels with the 140 class bullets and any case much larger then this really does not offer alot more velocity in this caliber. If by chance he could get the velocities this high, there is no match quality VLD on the market that would survive such a launch. Well, the Wildcat bullets that Richard Graves builds may handle this as he can build bonded core long range designs but I have never heard of a 6.5 round that would drive this bullet weight this fast. Other then that you would have to shoot either a Partition, X or some of the exotic solid alloy bullets and even these would be strained at 3800 fps. Most match bullets will top out in the 3200-3500 fps range for peak accuracy and most calibers will be in the 3200-3300 fps range. Again tight moa groups are far more important then hyper velocity. I have seen accuracy come at low pressure/velocity levels and at pressures I would consider on the ragged edge of safety. It all depends on the rifle, the bullet and enough other factors to sink a ship. If I were you I would keep your STW until you burn the barrel out. It is true the 7mm RUM is a larger case but not by the as much as you think. You may be able to get 20 more grains of ultra slow burning powder in the case but youwill get about 150-175 fps more velocity and not the 300 fps you are expecting. In conventional rifles(26" barrels) the RUM will average 125 fps over the full length standard belted magnum rounds of same caliber. Likewise, the 300 RUM will come within 125 fps of the huge 30-378 Wby with 180-200 gr bullets. True with longer barrels the big Wby will gain more of a velocity edge but not more then 200 fps in my testing. Still this is a major increase in performance but sometimes more then match bullets can handle. IF you have guys wanting to use match VLD bullets in big cased rounds, remind them that these bullets have velocity limits and make sure they know this before they spend $3000 on a rifle that will drive a 140 gr bullet to 3600 fps but will only be accurate when driven to 3300 fps. Been down that road early in my career and its no fun trying to explain things after the fact. GOod Shooting!!! Kirby Allen(50) [/QUOTE]
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