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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Snipe-Tac - Load Evaluation Wanted
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<blockquote data-quote="Just Learnin" data-source="post: 211899" data-attributes="member: 3957"><p>Hey guys, finally got to do some load work-up this morning. I'm shooting a 338 snipe-tac made by Dave Viers (specs posted down in Gun Photos). I used H50BMG powder, 300gr SMKs (boron coated), and WLRM primers. I waited about 3 minutes between shots, putting the rifle and ammo in the shade between shots. Shots were made round robin, i.e. one 135gr, one 136gr, etc. It was sunny (mirage was pretty bad so you gotta cut me a little slack for the group size <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />) with a light (est. 2-5 mph) left to right breeze. Temperature ran from 45* at the start to about 50* at the end and elevation of 2621 (no humidity reading, forgot the Brunton). Distance to target was 235 yards and I used an Oehler model 35P chronograph. Group size is center to center.</p><p> </p><p>135gr</p><p>1 3113fps (sighter/fouler shot)</p><p>2 no reading</p><p>3 no reading (shots 2 and 3 almost touching)</p><p>4 3134fps</p><p>es = 21fps</p><p>group size = 1.7" or 0.72moa</p><p> </p><p>136gr</p><p>1 3134fps</p><p>2 no reading</p><p>3 3128fps</p><p>es = 6fps</p><p>group size = 1.52" or 0.65moa</p><p> </p><p>137gr</p><p>1 3157fps</p><p>2 3150fps</p><p>3 3169fps</p><p>es = 19fps</p><p>group size = 1.38" or 0.59moa</p><p> </p><p>138gr</p><p>1 3171fps</p><p>2 3174fps</p><p>3 3179fps</p><p>es = 8fps</p><p>group size = 1.62" or .69moa</p><p> </p><p>139gr</p><p>1 3193fps</p><p>2 3208fps (1st two shots touching)</p><p>3 3208fps</p><p>es = 15fps</p><p>group size = 1.05" or 0.45moa</p><p> </p><p>140gr</p><p>1 3218fps</p><p>2 3225fps</p><p>3 3232fps</p><p>es = 14fps</p><p>group size = 1.17" or 0.50moa</p><p> </p><p>I thought about fine-tuning the upper spectrum, say 138.5gr, 139gr, 139.5gr, and 140gr. Maybe 5 shots each to gather a little more chrono data? The load at 139 sure looked promising to me, except for the first shot being 15fps slower...</p><p> </p><p>Any thoughts or comments? Thanks! -- Don</p></blockquote><p></p>
[QUOTE="Just Learnin, post: 211899, member: 3957"] Hey guys, finally got to do some load work-up this morning. I'm shooting a 338 snipe-tac made by Dave Viers (specs posted down in Gun Photos). I used H50BMG powder, 300gr SMKs (boron coated), and WLRM primers. I waited about 3 minutes between shots, putting the rifle and ammo in the shade between shots. Shots were made round robin, i.e. one 135gr, one 136gr, etc. It was sunny (mirage was pretty bad so you gotta cut me a little slack for the group size :D) with a light (est. 2-5 mph) left to right breeze. Temperature ran from 45* at the start to about 50* at the end and elevation of 2621 (no humidity reading, forgot the Brunton). Distance to target was 235 yards and I used an Oehler model 35P chronograph. Group size is center to center. 135gr 1 3113fps (sighter/fouler shot) 2 no reading 3 no reading (shots 2 and 3 almost touching) 4 3134fps es = 21fps group size = 1.7" or 0.72moa 136gr 1 3134fps 2 no reading 3 3128fps es = 6fps group size = 1.52" or 0.65moa 137gr 1 3157fps 2 3150fps 3 3169fps es = 19fps group size = 1.38" or 0.59moa 138gr 1 3171fps 2 3174fps 3 3179fps es = 8fps group size = 1.62" or .69moa 139gr 1 3193fps 2 3208fps (1st two shots touching) 3 3208fps es = 15fps group size = 1.05" or 0.45moa 140gr 1 3218fps 2 3225fps 3 3232fps es = 14fps group size = 1.17" or 0.50moa I thought about fine-tuning the upper spectrum, say 138.5gr, 139gr, 139.5gr, and 140gr. Maybe 5 shots each to gather a little more chrono data? The load at 139 sure looked promising to me, except for the first shot being 15fps slower... Any thoughts or comments? Thanks! -- Don [/QUOTE]
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338 Snipe-Tac - Load Evaluation Wanted
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