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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Muzzle velocity variation
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<blockquote data-quote="Brent" data-source="post: 33350" data-attributes="member: 99"><p>I use the 210M and 215M for most all my loads, sometimes the BR-2. It's the last thing I play with, right or wrong. </p><p></p><p>I also shoot for a 10 fps ES, but realistically and if I can only get 15-20 fps in the big cases I'm not burning ammo to tighten it by 5-10 any longer. If the groups are suffering in the least, I think it's more important to focus on the charge weight, powder choice, or shooting technique to keep the vertical at LR minimized. </p><p></p><p>This load here, I've got a few more groups to shoot with it to see what it'll produce, then I'll try the 215M as well. 20 rounds gives a guy a good idea if he'd headed the right dirrection or the wrong, in groups and ES at the same time... gotta have both working. </p><p></p><p>I think it takes far less than 60 fps to miss, although 60 fps can do it by itself. If errors stack up from changes in air density, MV variations from temp changes, BC variations, ballistic program errors etc., you'll want the ES to be low as you can possibly get it for LR accuracy. </p><p></p><p></p><p>Here's a load I just tested in the 30-338 Lapua Imp a couple of days ago. </p><p></p><p>210 JLK</p><p>88.0 gr RL-25 </p><p>GM-210M</p><p>3.823" OAL (3.117" ogive w/ Stoney Point tool)</p><p>.005" into lands</p><p></p><p></p><p>Data from the Oehler 35P on the 100 yard groups.</p><p>Data from the screens with 2' spacing on left, 4' is on right.</p><p> </p><p>3154 - 01 - 3144</p><p>3167 - 02 - 3151</p><p>3164 - 03 - 3156</p><p>3165 - 04 - 3158</p><p>3168 - 05 - 3149</p><p>3160 - 06 - 3152</p><p>3154 - 07 - 3153</p><p>3169 - 08 - 3168</p><p>3160 - 09 - 3158</p><p>3162 - 10 - 3159</p><p>3164 - 11 - 3163</p><p>3153 - 12 - 3151</p><p>3167 - 13 - 3163</p><p>3174 - 14 - 3168</p><p>3159 - 15 - 3157</p><p>3169 - 16 - 3169</p><p>3149 - 17 - 3149</p><p>3155 - 18 - 3155</p><p> </p><p>3157 AVE - 10' from muzzle</p><p> </p><p>ES is 20 - if you throw out the first fouler shot.</p></blockquote><p></p>
[QUOTE="Brent, post: 33350, member: 99"] I use the 210M and 215M for most all my loads, sometimes the BR-2. It's the last thing I play with, right or wrong. I also shoot for a 10 fps ES, but realistically and if I can only get 15-20 fps in the big cases I'm not burning ammo to tighten it by 5-10 any longer. If the groups are suffering in the least, I think it's more important to focus on the charge weight, powder choice, or shooting technique to keep the vertical at LR minimized. This load here, I've got a few more groups to shoot with it to see what it'll produce, then I'll try the 215M as well. 20 rounds gives a guy a good idea if he'd headed the right dirrection or the wrong, in groups and ES at the same time... gotta have both working. I think it takes far less than 60 fps to miss, although 60 fps can do it by itself. If errors stack up from changes in air density, MV variations from temp changes, BC variations, ballistic program errors etc., you'll want the ES to be low as you can possibly get it for LR accuracy. Here's a load I just tested in the 30-338 Lapua Imp a couple of days ago. 210 JLK 88.0 gr RL-25 GM-210M 3.823" OAL (3.117" ogive w/ Stoney Point tool) .005" into lands Data from the Oehler 35P on the 100 yard groups. Data from the screens with 2' spacing on left, 4' is on right. 3154 - 01 - 3144 3167 - 02 - 3151 3164 - 03 - 3156 3165 - 04 - 3158 3168 - 05 - 3149 3160 - 06 - 3152 3154 - 07 - 3153 3169 - 08 - 3168 3160 - 09 - 3158 3162 - 10 - 3159 3164 - 11 - 3163 3153 - 12 - 3151 3167 - 13 - 3163 3174 - 14 - 3168 3159 - 15 - 3157 3169 - 16 - 3169 3149 - 17 - 3149 3155 - 18 - 3155 3157 AVE - 10' from muzzle ES is 20 - if you throw out the first fouler shot. [/QUOTE]
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