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Long Range Hunting & Shooting
Interpeting Magnetospeed Data
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<blockquote data-quote="Greyfox" data-source="post: 924575" data-attributes="member: 10291"><p>As has been previously mentioned, velocities, considering your barrel length and charge weight the 175 SMK are not unrealistic. You stated that a string of fewer shots produced better ES. One thing to check is the tightness of the Magnetspeeds mount on the barrel. I had a similar experience with a well proven load that was indicating wider velocity spreads than normal. The problem was that after repeated shots the the Magnetospeeds mount had was slightly moving on the barrel. When I tightened it up my results returned to normal. I'm not sure this is contributing to your ES but worth checking. I use the extra rubber barrel mount supplied with the unit, and put it under the strap on top of the barrel, then make it very tight for a secure mount. on another note. Myself and a few of my buddies do a lot of 308 shooting. Like yourself we have had a lot of difficulty finding Fed210M's. We have found that the more available Winchester LR primers produced very similar, accuracy, velocity and ES in our rifles when tested against the Federal 210M's using Varget, R15, and IMR4895 powders.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 924575, member: 10291"] As has been previously mentioned, velocities, considering your barrel length and charge weight the 175 SMK are not unrealistic. You stated that a string of fewer shots produced better ES. One thing to check is the tightness of the Magnetspeeds mount on the barrel. I had a similar experience with a well proven load that was indicating wider velocity spreads than normal. The problem was that after repeated shots the the Magnetospeeds mount had was slightly moving on the barrel. When I tightened it up my results returned to normal. I'm not sure this is contributing to your ES but worth checking. I use the extra rubber barrel mount supplied with the unit, and put it under the strap on top of the barrel, then make it very tight for a secure mount. on another note. Myself and a few of my buddies do a lot of 308 shooting. Like yourself we have had a lot of difficulty finding Fed210M's. We have found that the more available Winchester LR primers produced very similar, accuracy, velocity and ES in our rifles when tested against the Federal 210M's using Varget, R15, and IMR4895 powders. [/QUOTE]
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Interpeting Magnetospeed Data
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