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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.243 rebarrel
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<blockquote data-quote="Centre Punch" data-source="post: 66182" data-attributes="member: 3048"><p>Hi Aussie,</p><p>The best load, that is most accurate out of 243 Remmy using the 90grn Scenar is:</p><p></p><p>41.5 grns of H4350 ext sparked by a Fed. 210M primer, for a velocity of 2880fps</p><p>Cartridge overall length with the bullet engraving into the lands by about .002" is 2.784".</p><p>I dont know if it would feed out of the mag box because i single loaded all my rounds.</p><p>This load would shoot into 1/2 moa all day with the best being just under 3/8" at 100yrds for 5 shots.</p><p></p><p>Loads of 42 and 42.5 grns gave higher velocities for a slight drop off in accuracy.</p><p>43 grns started to get a bit hot with a heavy bolt lift but gave 1/2" accurcy at 3050fps</p><p></p><p>Similar charges of Win 760 and H 380 gave excellent accuracy and velocities in the same bracket but burned dirtier and sooted the casses more.</p><p></p><p>All cases were Lapua, trimmed, neck turned for a approx.3/4 clean up, primer pockets uniformed and flash holes de-burred even though it may not be neccessary, i just like doing it.</p><p>In a custom chamber like your 243 ACK. i think the scenar will do very nicely /ubbthreads/images/graemlins/smile.gif</p><p></p><p>Ian.</p><p></p><p>PS. Just as a matter of interest 34 grns of H322 and a 70 grn SMK traveling at 3115 fps has given me my best accuracy to date with a 5 shot group of .348" but very sooty cases as far down as the case head! indicating incomplete sealing of the chamber by the case. /ubbthreads/images/graemlins/frown.gif</p><p>A 1 grn increase eliminated the sootiness but ruined the accuracy. /ubbthreads/images/graemlins/frown.gif /ubbthreads/images/graemlins/frown.gif</p></blockquote><p></p>
[QUOTE="Centre Punch, post: 66182, member: 3048"] Hi Aussie, The best load, that is most accurate out of 243 Remmy using the 90grn Scenar is: 41.5 grns of H4350 ext sparked by a Fed. 210M primer, for a velocity of 2880fps Cartridge overall length with the bullet engraving into the lands by about .002" is 2.784". I dont know if it would feed out of the mag box because i single loaded all my rounds. This load would shoot into 1/2 moa all day with the best being just under 3/8" at 100yrds for 5 shots. Loads of 42 and 42.5 grns gave higher velocities for a slight drop off in accuracy. 43 grns started to get a bit hot with a heavy bolt lift but gave 1/2" accurcy at 3050fps Similar charges of Win 760 and H 380 gave excellent accuracy and velocities in the same bracket but burned dirtier and sooted the casses more. All cases were Lapua, trimmed, neck turned for a approx.3/4 clean up, primer pockets uniformed and flash holes de-burred even though it may not be neccessary, i just like doing it. In a custom chamber like your 243 ACK. i think the scenar will do very nicely [img]/ubbthreads/images/graemlins/smile.gif[/img] Ian. PS. Just as a matter of interest 34 grns of H322 and a 70 grn SMK traveling at 3115 fps has given me my best accuracy to date with a 5 shot group of .348" but very sooty cases as far down as the case head! indicating incomplete sealing of the chamber by the case. [img]/ubbthreads/images/graemlins/frown.gif[/img] A 1 grn increase eliminated the sootiness but ruined the accuracy. [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/frown.gif[/img] [/QUOTE]
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.243 rebarrel
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