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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What are acceptable Chrono results?
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<blockquote data-quote="AtownBcat" data-source="post: 622633" data-attributes="member: 15385"><p>I was doing a little load development and settled on a load that shot very well in my 300WM. The load is as follows:</p><p>RWS Brass</p><p>76.5g Retumbo</p><p>CCI Mag primers</p><p>208 A-Max</p><p>This is an accurate round. I have shot several 5 round groups between .259(almost able to call it a .25....)and .313.</p><p>I decided to shoot 2 ten round strings to get some velocity data.</p><p>My first string was with sunshine overhead and the second string was with the sun dropping down behind a wall so there was not direct sunlight.</p><p>The chrono is a CED M2. The unit was 15ft from the muzzle.</p><p>First 10 rounds</p><p>2894(cold bore)</p><p>2908</p><p>2925(this round the bolt was a little hard to close the bolt, wish I had replaced this round with another one)</p><p>2900</p><p>2892</p><p>2898</p><p>2909</p><p>2902</p><p>2888</p><p>2890</p><p>so the Average was 2900</p><p>ES was 37(that one round jacked this up)</p><p>and a SD of 10.5</p><p></p><p>The second string was a little crazy...</p><p>2913</p><p>2919</p><p>2868</p><p>2914</p><p>2900</p><p>2856</p><p>2886</p><p>2844</p><p>2848</p><p>average 2875</p><p>ES 110</p><p>SD 34.9</p><p>Im tempted to throw the second group out but it still messes with my head..</p><p>What are acceptable ES and SD numbers? Should I be using the light packs to get more reliable results? What are your thoughts about my results?</p></blockquote><p></p>
[QUOTE="AtownBcat, post: 622633, member: 15385"] I was doing a little load development and settled on a load that shot very well in my 300WM. The load is as follows: RWS Brass 76.5g Retumbo CCI Mag primers 208 A-Max This is an accurate round. I have shot several 5 round groups between .259(almost able to call it a .25....)and .313. I decided to shoot 2 ten round strings to get some velocity data. My first string was with sunshine overhead and the second string was with the sun dropping down behind a wall so there was not direct sunlight. The chrono is a CED M2. The unit was 15ft from the muzzle. First 10 rounds 2894(cold bore) 2908 2925(this round the bolt was a little hard to close the bolt, wish I had replaced this round with another one) 2900 2892 2898 2909 2902 2888 2890 so the Average was 2900 ES was 37(that one round jacked this up) and a SD of 10.5 The second string was a little crazy... 2913 2919 2868 2914 2900 2856 2886 2844 2848 average 2875 ES 110 SD 34.9 Im tempted to throw the second group out but it still messes with my head.. What are acceptable ES and SD numbers? Should I be using the light packs to get more reliable results? What are your thoughts about my results? [/QUOTE]
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What are acceptable Chrono results?
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