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Long Range Hunting & Shooting
.264 Win Mag load development time
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<blockquote data-quote="BIG MO" data-source="post: 346290" data-attributes="member: 18994"><p>Update on the Sendero SFII .264-</p><p> </p><p>70 test rounds to date with the 140 Berger. I have focused on Retumbo and RL22 with good results. I worked upward with the Retumbo to 71 grains and 3350fps. Worked up to 66 grains of RL22 and 3200fps. The RL22 has consistantly shown the tightest groups and this will probably be my choice between the two. Interesting enough, this is the exact charge of RL22 I currently use in the 7mmRM with a 180 Berger @3000fps. </p><p> </p><p>I have all the reloading manuals and these charges are waaay over the listed max. I'm scratching my head a little bit due to this but all pressure signs in this rifle are within normal. Primers are not excessively flattened, primer pockets are holding firm, and bolt articulation during ejection is like butter. This rifle </p><p>seems to have one of the smoothest, easy to clean bores I have experienced with an off the shelf rifle. Also, I'm seating the bullets for a generous jump to the rifle lands. </p><p> </p><p>At these velocities the rifle is shooting pretty tight. From the start the rifle has shown a consistent pattern. From a cold bore the first two rounds go .3-.4 and the third round will open the group to .5-.7. My guess is stress in the barrel affecting POI once the heat starts to set into the barrel. I'm very pleased with results like this shooting Bergers at 100yds. Bergers are my least favorite bullet for shooting 100yd groups. </p><p> </p><p>As soon as I get a modifed Hornady cartridge case for my Stoney Point overall length gauge, I am going to do more testing with different bullet seating depths. Also, I'm going to give the brass a light neck turning and put some time in with the chronograph to check velocity consistency. </p><p> </p><p>I'm still a little ways away from 1000yd testing, but it won't be long. </p><p> </p><p>Its 70 degrees and sunshine here in Arizona. Perfect shooting conditions!</p></blockquote><p></p>
[QUOTE="BIG MO, post: 346290, member: 18994"] Update on the Sendero SFII .264- 70 test rounds to date with the 140 Berger. I have focused on Retumbo and RL22 with good results. I worked upward with the Retumbo to 71 grains and 3350fps. Worked up to 66 grains of RL22 and 3200fps. The RL22 has consistantly shown the tightest groups and this will probably be my choice between the two. Interesting enough, this is the exact charge of RL22 I currently use in the 7mmRM with a 180 Berger @3000fps. I have all the reloading manuals and these charges are waaay over the listed max. I'm scratching my head a little bit due to this but all pressure signs in this rifle are within normal. Primers are not excessively flattened, primer pockets are holding firm, and bolt articulation during ejection is like butter. This rifle seems to have one of the smoothest, easy to clean bores I have experienced with an off the shelf rifle. Also, I'm seating the bullets for a generous jump to the rifle lands. At these velocities the rifle is shooting pretty tight. From the start the rifle has shown a consistent pattern. From a cold bore the first two rounds go .3-.4 and the third round will open the group to .5-.7. My guess is stress in the barrel affecting POI once the heat starts to set into the barrel. I'm very pleased with results like this shooting Bergers at 100yds. Bergers are my least favorite bullet for shooting 100yd groups. As soon as I get a modifed Hornady cartridge case for my Stoney Point overall length gauge, I am going to do more testing with different bullet seating depths. Also, I'm going to give the brass a light neck turning and put some time in with the chronograph to check velocity consistency. I'm still a little ways away from 1000yd testing, but it won't be long. Its 70 degrees and sunshine here in Arizona. Perfect shooting conditions! [/QUOTE]
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