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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC 156gr Berger EOL twist dilemma
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<blockquote data-quote="dug" data-source="post: 2958268" data-attributes="member: 9523"><p><em><strong>1-7.5 would be my choice for the 140 class bullet you say would be used most of the time ,and the option for the 156 gr </strong></em></p><p><em><strong>especially if your not going to be shooting through transonic with the 156 ers at mile targets </strong></em></p><p><em><strong>in my opinion the 1-7 tw with 140's can turn pressure up before reaching max fps </strong></em></p><p><em><strong>again not a game changer depending where the barrel likes the accuracy note , but having to take the next note down because of pressure signs ,sucks.</strong></em></p><p><em><strong>its a balancing act on intended max range shooting (transonic)</strong></em></p><p><em><strong>and how important max fps is to hunting , which this rifle seems to be for ? ( #3 at 24" ) no one should be hunting at transonic .</strong></em></p><p><em><strong>time of flight can out run a higher BC for a while , but BC always wins if shot far enough. Run some velocity numbers with both bullets and see where the time of flight beats the higher BC in wind drift and impact fps which directly effects bullet performance On game.</strong></em></p><p><em><strong></strong></em></p><p><em><strong>case in point i run a 130 gr vld in my 260 rem gas gun , magazine length limits case capacity with 140's ,so the 130 at faster fps runs passed the 140 in max range i need for impact velocity for hunting . Shooting targets out to 1K yrds the slower 140's are king </strong></em></p><p><em><strong>but i dont hunt at those impact velocities .</strong></em></p><p><em><strong></strong></em></p><p><em><strong>a gain tw barrel, in theory ,can get your target tw rate and help keep pressure curve flatter .</strong></em></p><p><em><strong>i have no experience with them so i cant offer an opinion on them. </strong></em></p><p><em><strong>i have often wanted to try one , maybe the next blank i order</strong></em></p><p><em><strong></strong></em></p><p><em><strong>As to the left hand tw barrel it is a great idea to use. But how do you keep the barrel from loosening up with right hand threaded action and barrel tendon? Do you use a pin or set screws to secure it ? Years ago i asked many smiths about making a left hand tw barrel work on righthand threaded actions , no one was interested in helping me </strong></em></p><p><em><strong>hope this helps and doesnt cause more questions on the decision </strong></em></p></blockquote><p></p>
[QUOTE="dug, post: 2958268, member: 9523"] [I][B]1-7.5 would be my choice for the 140 class bullet you say would be used most of the time ,and the option for the 156 gr especially if your not going to be shooting through transonic with the 156 ers at mile targets in my opinion the 1-7 tw with 140’s can turn pressure up before reaching max fps again not a game changer depending where the barrel likes the accuracy note , but having to take the next note down because of pressure signs ,sucks. its a balancing act on intended max range shooting (transonic) and how important max fps is to hunting , which this rifle seems to be for ? ( #3 at 24” ) no one should be hunting at transonic . time of flight can out run a higher BC for a while , but BC always wins if shot far enough. Run some velocity numbers with both bullets and see where the time of flight beats the higher BC in wind drift and impact fps which directly effects bullet performance On game. case in point i run a 130 gr vld in my 260 rem gas gun , magazine length limits case capacity with 140’s ,so the 130 at faster fps runs passed the 140 in max range i need for impact velocity for hunting . Shooting targets out to 1K yrds the slower 140’s are king but i dont hunt at those impact velocities . a gain tw barrel, in theory ,can get your target tw rate and help keep pressure curve flatter . i have no experience with them so i cant offer an opinion on them. i have often wanted to try one , maybe the next blank i order As to the left hand tw barrel it is a great idea to use. But how do you keep the barrel from loosening up with right hand threaded action and barrel tendon? Do you use a pin or set screws to secure it ? Years ago i asked many smiths about making a left hand tw barrel work on righthand threaded actions , no one was interested in helping me hope this helps and doesnt cause more questions on the decision [/B][/I] [/QUOTE]
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6.5 PRC 156gr Berger EOL twist dilemma
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