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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5mm smc
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<blockquote data-quote="LWolken" data-source="post: 159259" data-attributes="member: 3194"><p>I read a story on this cartridge in Rifle Shooter Magazine (March/April 2006). It was interesting but as usuall had many contraditory statements. It claimed a velocity of 4700fps but if you looked at the chrony print out, a five shot string produced a high of 4692 and low of 4648 Then it compares the ballistics of the 32 grain Sierra BK to the BC of a 22 cal 40 Gr Ballistic tip. Refering to 4700fps with the 5 smc to 4400 fps out of a 22-250. Well the Chrony tape lists a Berger 30 gr bullet not the 32 gr Sierra they use in their comparison. Why? So typical misleading statements which generally tell me one thing....BS Later in the article though it does give a good explanation of why a shorter fatter case has less recoil. This is due to a smaller lighter propellant plug being acclerated into the bore. Makes sense to me knowing that most recoil is directly related to the weight of the bullet. Basically what they are saying is that due to the better surface area ignition of the short fat case the gas in the brass pushes against a lighter plug thus generating less recoil than on a long case of the same capacity. I can believe that.....Anyway I think its a neat design but untill brass is as cheap and available as say a 22-250 it will never be as popular as the others.</p><p></p><p>Lance</p></blockquote><p></p>
[QUOTE="LWolken, post: 159259, member: 3194"] I read a story on this cartridge in Rifle Shooter Magazine (March/April 2006). It was interesting but as usuall had many contraditory statements. It claimed a velocity of 4700fps but if you looked at the chrony print out, a five shot string produced a high of 4692 and low of 4648 Then it compares the ballistics of the 32 grain Sierra BK to the BC of a 22 cal 40 Gr Ballistic tip. Refering to 4700fps with the 5 smc to 4400 fps out of a 22-250. Well the Chrony tape lists a Berger 30 gr bullet not the 32 gr Sierra they use in their comparison. Why? So typical misleading statements which generally tell me one thing....BS Later in the article though it does give a good explanation of why a shorter fatter case has less recoil. This is due to a smaller lighter propellant plug being acclerated into the bore. Makes sense to me knowing that most recoil is directly related to the weight of the bullet. Basically what they are saying is that due to the better surface area ignition of the short fat case the gas in the brass pushes against a lighter plug thus generating less recoil than on a long case of the same capacity. I can believe that.....Anyway I think its a neat design but untill brass is as cheap and available as say a 22-250 it will never be as popular as the others. Lance [/QUOTE]
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5mm smc
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