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257 wby mag - 257 stw - 257 AM
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<blockquote data-quote="Fiftydriver" data-source="post: 83982" data-attributes="member: 10"><p>Justin,</p><p></p><p>Well, I personally feel that the comments your smith gave you are not correct. In my opinion and thats all this is, he is giving you simply his opinion. If that makes any sense at all.</p><p></p><p>I have built several 257 STWs with barrel lengths from 26 up to 30".</p><p></p><p>I have not built any 257 Wby rifles yet but I have developed loads for several over the years and I will tell you that on average, out of same length barrel, with same bullet weights, with both rounds loaded to top pressures with appropriate powders, the STW will offer a solid 200 fps advantage over the Wby.</p><p></p><p>This is on average remember, as stated there are rare instances where this is not the case but I have yet to see a 257 Wby get within 150 fps of a properly loaded STW.</p><p></p><p>I have however heard the same comments you are hearing from guys that say the WBY is getting everything the STW gets and with less powder.</p><p></p><p>My first question to them is what powders are you using in the STW? They generally say they are using something like RL-22 in both!!</p><p></p><p>The 257 WBY and STW comparision are like apples and oranges. They are two totally differnet beasts and need to be loaded with totally different componants to get the most out of each round. </p><p></p><p>When loaded properly the STW will kick the hell out of the WBY in performance but that is not to say its a vastly superior round. Depends on what you want to do with the rifle.</p><p></p><p>You also need to consider that the larger the case the less the velocity advantage will be with lightweight bullets. I would agree with something like an 85 gr ballistic tip, the Wby would probably run very close to the STW but remember that this is not what the STW is designed to shoot.</p><p></p><p>I have yet to see a 257 Wby hit a solid 3800 fps with a 100 gr bullet in a 26" barrel. The STW will do this easily.</p><p></p><p>The main advantage is that as bullet weight increases, the advantage for the larger case capacity increases as well. The heavier the better.</p><p></p><p>The Allen Mag will give you 200 fps over what the STW will with bullet weights from 100 to 156 gr. I have actually been able to test this first hand. I took my 257 STW with its 30" Lilja and worked up loads with it when it was new.</p><p></p><p>100 gr..........3945 fps</p><p>115 gr..........3710 fps</p><p>130 gr..........3455 fps</p><p></p><p>When I designed the 257 AM, I took that same barrel, set it back and rechambered to the shorter fatter case. This is the results with same bullet weights in same but 1/2" shorter barrel:</p><p></p><p>100 gr.........4090 fps</p><p>115 gr.........3895 fps</p><p>130 gr.........3675 fps</p><p></p><p>Now thats about as fair of a comparision as one can make as its out of the exact same barrel. Both chambers were designed by me with the same specs as far as throat design and body design in the chamber.</p><p></p><p>Both rounds were also loaded to top pressures. I am not one to shy away from a bit of pressure so I assure you I was getting the most out of each round.</p><p></p><p>As far as the 30 STW being the full equal to the 300 RUM factory loadings. That may well be. I have chronoed no less then five different lots of 180 gr 300 RUM factory ammo and they all have ranges in average velocity from 3200 to 3250 fps!!!</p><p></p><p>Yes a 30 STW or 300 Wby or 200 Jarrett will reach this level with top handloads but this is a silly comparision. If you handload the 300 RUM most 26" barreled rifles will push 3400fps with top loads. Compare that to the top loads in a 30 STW and your still 150 fps higher in velocity.</p><p></p><p>Appearantly it sounds like your smith needs a 300 fps advantage to consider it a meaningful increase.</p><p></p><p>Again in this case, the heavier the bullet the better the big case does compared to the smaller capacity round.</p><p></p><p>The only way the above comment from your smith may be true are in very limited instances and in short barrels. On average with barrels in the 26" and longer lengths, this will not be correct.</p><p></p><p>Just my experience.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 83982, member: 10"] Justin, Well, I personally feel that the comments your smith gave you are not correct. In my opinion and thats all this is, he is giving you simply his opinion. If that makes any sense at all. I have built several 257 STWs with barrel lengths from 26 up to 30". I have not built any 257 Wby rifles yet but I have developed loads for several over the years and I will tell you that on average, out of same length barrel, with same bullet weights, with both rounds loaded to top pressures with appropriate powders, the STW will offer a solid 200 fps advantage over the Wby. This is on average remember, as stated there are rare instances where this is not the case but I have yet to see a 257 Wby get within 150 fps of a properly loaded STW. I have however heard the same comments you are hearing from guys that say the WBY is getting everything the STW gets and with less powder. My first question to them is what powders are you using in the STW? They generally say they are using something like RL-22 in both!! The 257 WBY and STW comparision are like apples and oranges. They are two totally differnet beasts and need to be loaded with totally different componants to get the most out of each round. When loaded properly the STW will kick the hell out of the WBY in performance but that is not to say its a vastly superior round. Depends on what you want to do with the rifle. You also need to consider that the larger the case the less the velocity advantage will be with lightweight bullets. I would agree with something like an 85 gr ballistic tip, the Wby would probably run very close to the STW but remember that this is not what the STW is designed to shoot. I have yet to see a 257 Wby hit a solid 3800 fps with a 100 gr bullet in a 26" barrel. The STW will do this easily. The main advantage is that as bullet weight increases, the advantage for the larger case capacity increases as well. The heavier the better. The Allen Mag will give you 200 fps over what the STW will with bullet weights from 100 to 156 gr. I have actually been able to test this first hand. I took my 257 STW with its 30" Lilja and worked up loads with it when it was new. 100 gr..........3945 fps 115 gr..........3710 fps 130 gr..........3455 fps When I designed the 257 AM, I took that same barrel, set it back and rechambered to the shorter fatter case. This is the results with same bullet weights in same but 1/2" shorter barrel: 100 gr.........4090 fps 115 gr.........3895 fps 130 gr.........3675 fps Now thats about as fair of a comparision as one can make as its out of the exact same barrel. Both chambers were designed by me with the same specs as far as throat design and body design in the chamber. Both rounds were also loaded to top pressures. I am not one to shy away from a bit of pressure so I assure you I was getting the most out of each round. As far as the 30 STW being the full equal to the 300 RUM factory loadings. That may well be. I have chronoed no less then five different lots of 180 gr 300 RUM factory ammo and they all have ranges in average velocity from 3200 to 3250 fps!!! Yes a 30 STW or 300 Wby or 200 Jarrett will reach this level with top handloads but this is a silly comparision. If you handload the 300 RUM most 26" barreled rifles will push 3400fps with top loads. Compare that to the top loads in a 30 STW and your still 150 fps higher in velocity. Appearantly it sounds like your smith needs a 300 fps advantage to consider it a meaningful increase. Again in this case, the heavier the bullet the better the big case does compared to the smaller capacity round. The only way the above comment from your smith may be true are in very limited instances and in short barrels. On average with barrels in the 26" and longer lengths, this will not be correct. Just my experience. Kirby Allen(50) [/QUOTE]
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