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Rifles, Reloading, Optics, Equipment
Reloading
270wsm and Barnes TTSX powder question
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<blockquote data-quote="Jesse09" data-source="post: 1054112" data-attributes="member: 88547"><p>Today on the bench was about as frustrating as it gets for me:</p><p></p><p>1. 19*F</p><p>2. 115 mile drive </p><p>3. I fired six fouling shots through my scrubbed barrel, not realizing that three of them were what should have been saved as my .005" (off lands) group. </p><p>4. My MagnetoSpeed V2 chrony returned wildly erratic muzzle velocities, some as high as 9500 fps.</p><p>5. All loads were 64.0 gns IMR 4350, seating the TTSX 110gn Barnes.</p><p>6. Here are my three-shot group sizes:</p><p></p><p>.010" off lands = .763" (two shots touching)</p><p>.050" =1.366" (with shot number 2 a flyer; shots 1 & 3 = .262")</p><p>.060" = .889" (the only true equilateral triangle)</p><p>.075" = .924" (a descending-to-the-right straight diagonal)</p><p></p><p>So, what did I learn? (I've already emailed MagnetoSpeed.) I really wish I hadn't lost the chance to shoot that .005" seating. It might have, with the .010" seating, lent some argument towards a close to the lands seating. (No pressure indications.)</p><p></p><p>On the other hand, though, the larger gapped groups also showed promise.</p><p></p><p>The chrony could have given some much needed informaton (if it was working correctly) by comparing muzzle velocity and extreme spread among all the groups. </p><p></p><p>What I think I did learn is that these bullets are going to be relatively easy to work with, unlike the Swift Scirocco II's.</p><p></p><p>So, I plan to load two groups at .005" and to repeat the other four groups shot today. Since all of these cartridge overall lengths exceed the magazine maximum, I may load a group with a c.o.a.l of 2.86"; that would give me an extreme gap to set the upper end.</p><p></p><p>I haven't decided whether to wait until I have a working MagnetoSpeed chrony or use my conventional Shooting Chrony. The MagnetoSpeed spoiled me - I got used to the easy setup and never dropping a shot.</p><p></p><p>I'd appreciate your feedback if you think I've missed something.</p><p></p><p>Jesse</p></blockquote><p></p>
[QUOTE="Jesse09, post: 1054112, member: 88547"] Today on the bench was about as frustrating as it gets for me: 1. 19*F 2. 115 mile drive 3. I fired six fouling shots through my scrubbed barrel, not realizing that three of them were what should have been saved as my .005" (off lands) group. 4. My MagnetoSpeed V2 chrony returned wildly erratic muzzle velocities, some as high as 9500 fps. 5. All loads were 64.0 gns IMR 4350, seating the TTSX 110gn Barnes. 6. Here are my three-shot group sizes: .010" off lands = .763" (two shots touching) .050" =1.366" (with shot number 2 a flyer; shots 1 & 3 = .262") .060" = .889" (the only true equilateral triangle) .075" = .924" (a descending-to-the-right straight diagonal) So, what did I learn? (I've already emailed MagnetoSpeed.) I really wish I hadn't lost the chance to shoot that .005" seating. It might have, with the .010" seating, lent some argument towards a close to the lands seating. (No pressure indications.) On the other hand, though, the larger gapped groups also showed promise. The chrony could have given some much needed informaton (if it was working correctly) by comparing muzzle velocity and extreme spread among all the groups. What I think I did learn is that these bullets are going to be relatively easy to work with, unlike the Swift Scirocco II's. So, I plan to load two groups at .005" and to repeat the other four groups shot today. Since all of these cartridge overall lengths exceed the magazine maximum, I may load a group with a c.o.a.l of 2.86"; that would give me an extreme gap to set the upper end. I haven't decided whether to wait until I have a working MagnetoSpeed chrony or use my conventional Shooting Chrony. The MagnetoSpeed spoiled me - I got used to the easy setup and never dropping a shot. I'd appreciate your feedback if you think I've missed something. Jesse [/QUOTE]
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270wsm and Barnes TTSX powder question
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