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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New 17 cal project, +600 yard reach???..............
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<blockquote data-quote="brianwinzor" data-source="post: 114601" data-attributes="member: 1067"><p>Kirby, I have been waiting for about 10 years for someone to develop these, and as usual Richard comes to the fore. </p><p></p><p>The capacity of the 17/223 AI should be around 30.5 to 31.0 grains unless the shoulder is pushed forward and the neck shortened, when it increases slightly to about 31.5 grains.</p><p></p><p>I am using a .17/222 Mag improved (40) which has a capacity of about 31.0 grains which achieves about 4,400 fps with the 25 grain bullet, 4,100 with the 30 grain. Although I realised the 1 in 10 twist would not stabilise the 37 grain Berger 37 grain VLD (.858 in) it produced almost 3,800 fps in 24.5 inch barrel.</p><p></p><p>I think you will be surprised (like me) at which powders you can use, as a 100% load density (30.0 grains) of Winchester 785 (ball) produced maximum pressure and a velocity of about 3,795 fps. A maximum pressure load of 27.0 grains of Hodgdon 414 and Win 760 produced a similar velocity, but only had a load density of 92%.</p><p></p><p>Win 785 is similar in burning rate to H4831sc, Re22, etc, so with the heavier 45 grain bullet I was envisaging using my remaining stock of Winchester WMR, which I found is about 0.5 - 1.0 grains faster burning than H1000, and about 2 - 2.5 grains slower than Win 785. (Ramshot powders are not available in Oz) A load of 30.0 grains WMR produced 3596 fps with mild pressure with the 37 grain VLD, but may just reach max with the 45 grain bullet.</p><p></p><p>The powder selection will as always depend on how the barrel is throated and how far the base of the bullet projects down into the case.</p><p></p><p>I really hope that Richard's expertise will come to the fore, and can devise a way to make the bullets withstand the rpms, as quite a few others have tried and failed. The 45 grain bullet at 3,600 in a 6 twist barrel produces 432,000 rpm.</p><p></p><p>I desperately hope that his trials will prove a success. Good luck, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 114601, member: 1067"] Kirby, I have been waiting for about 10 years for someone to develop these, and as usual Richard comes to the fore. The capacity of the 17/223 AI should be around 30.5 to 31.0 grains unless the shoulder is pushed forward and the neck shortened, when it increases slightly to about 31.5 grains. I am using a .17/222 Mag improved (40) which has a capacity of about 31.0 grains which achieves about 4,400 fps with the 25 grain bullet, 4,100 with the 30 grain. Although I realised the 1 in 10 twist would not stabilise the 37 grain Berger 37 grain VLD (.858 in) it produced almost 3,800 fps in 24.5 inch barrel. I think you will be surprised (like me) at which powders you can use, as a 100% load density (30.0 grains) of Winchester 785 (ball) produced maximum pressure and a velocity of about 3,795 fps. A maximum pressure load of 27.0 grains of Hodgdon 414 and Win 760 produced a similar velocity, but only had a load density of 92%. Win 785 is similar in burning rate to H4831sc, Re22, etc, so with the heavier 45 grain bullet I was envisaging using my remaining stock of Winchester WMR, which I found is about 0.5 - 1.0 grains faster burning than H1000, and about 2 - 2.5 grains slower than Win 785. (Ramshot powders are not available in Oz) A load of 30.0 grains WMR produced 3596 fps with mild pressure with the 37 grain VLD, but may just reach max with the 45 grain bullet. The powder selection will as always depend on how the barrel is throated and how far the base of the bullet projects down into the case. I really hope that Richard's expertise will come to the fore, and can devise a way to make the bullets withstand the rpms, as quite a few others have tried and failed. The 45 grain bullet at 3,600 in a 6 twist barrel produces 432,000 rpm. I desperately hope that his trials will prove a success. Good luck, Brian. [/QUOTE]
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New 17 cal project, +600 yard reach???..............
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