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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 mag reloading conundrum?
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<blockquote data-quote="Pistol packer" data-source="post: 529426" data-attributes="member: 34702"><p>looks like you are getting really good advice and glad you picked up on the lighting issue. i have several chronographs but use the chrony some because of the ease. found muzzle blast and lighting the two tempermental issues. the lighting thing you seemed to got ahold of. another way to handle the muzzle blast : i put my chrony down somewhat and let the concrete bench protect it. often the blast hitting the unit is what screws it up and as long as the unit is protected it will register just fine. </p><p>even if it knocks off the screens.</p><p>the bearing surface would not produce such a drastic change. as long as the bullet is in the barrel the powder will be buring with that slow burning powder, so length of time in the barrel is critical to the total amount of powder burned. the bearing surface (shorter one) would decrease the overall length of time, but very small amount and actually often produces faster velocities because of the lack of friction, although it is very small usually (sort of like moly coated bullets). sounds like you are getting great groups, but you should probably use a faster powder. i agree with the previous comment that IMR 4350 would be the best or at least better as i usually get 2950 with 175 grainers with just mild pressure signs and no jump to lands. even the 300 WM usually performs better with that powder and that is substantially more powder. the really slow powders are for large bullets in really overbore cartridges such as the edge, or RUM's. </p><p>keep experimenting and keep talking. always keen to hear from someone's experiences.</p></blockquote><p></p>
[QUOTE="Pistol packer, post: 529426, member: 34702"] looks like you are getting really good advice and glad you picked up on the lighting issue. i have several chronographs but use the chrony some because of the ease. found muzzle blast and lighting the two tempermental issues. the lighting thing you seemed to got ahold of. another way to handle the muzzle blast : i put my chrony down somewhat and let the concrete bench protect it. often the blast hitting the unit is what screws it up and as long as the unit is protected it will register just fine. even if it knocks off the screens. the bearing surface would not produce such a drastic change. as long as the bullet is in the barrel the powder will be buring with that slow burning powder, so length of time in the barrel is critical to the total amount of powder burned. the bearing surface (shorter one) would decrease the overall length of time, but very small amount and actually often produces faster velocities because of the lack of friction, although it is very small usually (sort of like moly coated bullets). sounds like you are getting great groups, but you should probably use a faster powder. i agree with the previous comment that IMR 4350 would be the best or at least better as i usually get 2950 with 175 grainers with just mild pressure signs and no jump to lands. even the 300 WM usually performs better with that powder and that is substantially more powder. the really slow powders are for large bullets in really overbore cartridges such as the edge, or RUM's. keep experimenting and keep talking. always keen to hear from someone's experiences. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 mag reloading conundrum?
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