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Long Range Hunting & Shooting
6.5 build for 140 Bergers at 2900-3000?
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<blockquote data-quote="Capt RB" data-source="post: 1562032" data-attributes="member: 85987"><p>I'd suggest a 26" barrel with a short mag loaded light. The 6.5 4.S was concocted for hitting the speed limit in PRS with lower pressure so they had some barrel life. 2900-3Kfps is easy for the various short mags. The 6.5x55ai would be good for the speed also.</p><p> Because you are not looking for every last foot per second, you can set the reamer up for a shorter throat to fit the magazine length. The other thing would be to use H1000 or 7828. Both will be a bit better than a double base propellant like Rl26 or 4955(I'm liking more and more) Both will have a higher heat index that will promote more aggressive throat wear.</p><p>Other rounds mentioned will hit your desired performance envelope but at a higher pressure. The higher that pressure the hotter the throat temps. The other option woould to throat a short mag like Rich's SS or SST for the whole enchilada. Then just throattle back on the load. This way you would have the option to go full ret**d if you desired down the road.</p></blockquote><p></p>
[QUOTE="Capt RB, post: 1562032, member: 85987"] I'd suggest a 26" barrel with a short mag loaded light. The 6.5 4.S was concocted for hitting the speed limit in PRS with lower pressure so they had some barrel life. 2900-3Kfps is easy for the various short mags. The 6.5x55ai would be good for the speed also. Because you are not looking for every last foot per second, you can set the reamer up for a shorter throat to fit the magazine length. The other thing would be to use H1000 or 7828. Both will be a bit better than a double base propellant like Rl26 or 4955(I'm liking more and more) Both will have a higher heat index that will promote more aggressive throat wear. Other rounds mentioned will hit your desired performance envelope but at a higher pressure. The higher that pressure the hotter the throat temps. The other option woould to throat a short mag like Rich's SS or SST for the whole enchilada. Then just throattle back on the load. This way you would have the option to go full ret**d if you desired down the road. [/QUOTE]
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6.5 build for 140 Bergers at 2900-3000?
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