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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what 6mm
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<blockquote data-quote="Trickymissfit" data-source="post: 787943" data-attributes="member: 25383"><p>*I honestly think the improved 6mm International might just be the perfect 6mm case. Looking at the three I have some data on, one is kind of left stunned! With a 100 grain bullet in each round the Durham version does 2970fps in a 22" barrel with H380 powder. The same round with 4350 goes 3100fps! Now that round has a slightly shortened neck length (I'd guess it to be about .34") and a 40 degree shoulder with minimum taper. That round with a 24" barrel and some of our newer powders (H1000?) ought to hit the 3250fps mark. Cases can be formed from .243, .250 Sav., or even 22-250 brass as it has an overall length of 1.875". Looks like he reamed the chamber with a standard 6mmAI reamer.</p><p> </p><p>*The Donaldson International starts out similar, but uses the standard taper and a 30 degree shoulder with a shorter necklength (probably about .33"). He got 3200fps with that 100 grain bullet in an unknown barrel length (4350 powder again)</p><p> </p><p>* The Remington International design has a lot of taper in the case with a very long neck length (close to .37"). Walker still got 3060fps out of it! (must have been a very hot load) He used 4064 powder. </p><p> </p><p>These rounds are ideal for a short action Remington (known to be a little on the short side anyway). Are extremely efficient, and from the shoulders forward are very well designed, and should have a very good barrel life. The Donaldson and Durham version are far better rounds than a Dasher. Yet similar in many ways.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 787943, member: 25383"] *I honestly think the improved 6mm International might just be the perfect 6mm case. Looking at the three I have some data on, one is kind of left stunned! With a 100 grain bullet in each round the Durham version does 2970fps in a 22" barrel with H380 powder. The same round with 4350 goes 3100fps! Now that round has a slightly shortened neck length (I'd guess it to be about .34") and a 40 degree shoulder with minimum taper. That round with a 24" barrel and some of our newer powders (H1000?) ought to hit the 3250fps mark. Cases can be formed from .243, .250 Sav., or even 22-250 brass as it has an overall length of 1.875". Looks like he reamed the chamber with a standard 6mmAI reamer. *The Donaldson International starts out similar, but uses the standard taper and a 30 degree shoulder with a shorter necklength (probably about .33"). He got 3200fps with that 100 grain bullet in an unknown barrel length (4350 powder again) * The Remington International design has a lot of taper in the case with a very long neck length (close to .37"). Walker still got 3060fps out of it! (must have been a very hot load) He used 4064 powder. These rounds are ideal for a short action Remington (known to be a little on the short side anyway). Are extremely efficient, and from the shoulders forward are very well designed, and should have a very good barrel life. The Donaldson and Durham version are far better rounds than a Dasher. Yet similar in many ways. gary [/QUOTE]
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