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Rifles, Reloading, Optics, Equipment
Reloading
High velocity readings
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<blockquote data-quote="Abolt" data-source="post: 1285140" data-attributes="member: 61346"><p>I have a 300 wsm with a bartlein 26" barrel. I tested some Hornady 150g btsp and h4350. When I loaded these up I used the data from the Hornady book, after looking tonight I noticed they are 3 grains heavier than my other books I have. I'm wondering if my chronograph could be off or if anyone has any other ideas.</p><p></p><p>My load:</p><p>Norma 300 wsm case</p><p>Hornady 150g btsp</p><p>Col .010 from lands</p><p>Federal gm215m</p><p>H4350 67g, 68g, 69g, 70g, 71g.</p><p></p><p>Here are the velocitys:</p><p></p><p>67g: avg: 3184 sd: 7.54</p><p>3181</p><p>3176</p><p>3190</p><p>3192</p><p></p><p>68g: avg: 3339 sd: 30.74</p><p>3303</p><p>3351</p><p>3375</p><p>3329</p><p></p><p>69g: avg: 3386 sd: 13.95</p><p>3374</p><p>3396</p><p>3374</p><p>3400</p><p></p><p>70g: avg: 3370 sd: 11.15</p><p>3361</p><p>3364</p><p>3370</p><p>3386</p><p></p><p>71g: avg: 3465 sd: 8.85</p><p>3475</p><p>3471</p><p>3459</p><p>3457</p><p></p><p>Looking at these numbers velocity is considerably higher than book values. The 71g load is pushing RUM numbers. Here is a picture of one primer from each group. 67g bottom left and 71 top right, cannot get the picture to rotate. Also the 100 yd group of the 71g. .377" first 3 and .54" overall. It seems to have potential.</p></blockquote><p></p>
[QUOTE="Abolt, post: 1285140, member: 61346"] I have a 300 wsm with a bartlein 26" barrel. I tested some Hornady 150g btsp and h4350. When I loaded these up I used the data from the Hornady book, after looking tonight I noticed they are 3 grains heavier than my other books I have. I'm wondering if my chronograph could be off or if anyone has any other ideas. My load: Norma 300 wsm case Hornady 150g btsp Col .010 from lands Federal gm215m H4350 67g, 68g, 69g, 70g, 71g. Here are the velocitys: 67g: avg: 3184 sd: 7.54 3181 3176 3190 3192 68g: avg: 3339 sd: 30.74 3303 3351 3375 3329 69g: avg: 3386 sd: 13.95 3374 3396 3374 3400 70g: avg: 3370 sd: 11.15 3361 3364 3370 3386 71g: avg: 3465 sd: 8.85 3475 3471 3459 3457 Looking at these numbers velocity is considerably higher than book values. The 71g load is pushing RUM numbers. Here is a picture of one primer from each group. 67g bottom left and 71 top right, cannot get the picture to rotate. Also the 100 yd group of the 71g. .377" first 3 and .54" overall. It seems to have potential. [/QUOTE]
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High velocity readings
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