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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Different types of rifling and there uses.
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<blockquote data-quote="tim_w" data-source="post: 1350237" data-attributes="member: 11132"><p>I think as much as different rifling designs effects various aspects of ammo performance etc are the ratio and dimensions of groove to land themselves not just general number or design. Not only in width but depth/hieght. As an example you can get different effects from 4 grooves that uses 50/50 land to groove ratio versus say where the land are 1/2 width. The larger and taller lands the harder it can be on thin jackets when speed get up. Kirby Allen had to make adjustments from the standard 3 groove dimensions. The land had to be reduced and groove increased to keep bullets to hold together. </p><p></p><p>The other issue that is sort of at odds with lower friction from engraving is throat live. Obviously the more lands the smaller they are and the faster they will erode. The larger and taller they are the slower they will.</p><p></p><p>I like the R or canted lands on the side as you really do not lose surface area as much for ease of engraving force. I also like a slightly taller land and a bit narrower as opposed to the flip. I have found it seems to work better for throat life. I also like non-opposing land and grooves (odd number) as I feel its deformation force is less but I have only tested this with strain gauge. It minor either way but I figure why not try to get every bit you can as it adds up.</p><p></p><p>When you get up into the big long real ELR bullets etc I think things can change somewhat as other considerations come into play as even the smallest of things have a effect at 2 miles.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1350237, member: 11132"] I think as much as different rifling designs effects various aspects of ammo performance etc are the ratio and dimensions of groove to land themselves not just general number or design. Not only in width but depth/hieght. As an example you can get different effects from 4 grooves that uses 50/50 land to groove ratio versus say where the land are 1/2 width. The larger and taller lands the harder it can be on thin jackets when speed get up. Kirby Allen had to make adjustments from the standard 3 groove dimensions. The land had to be reduced and groove increased to keep bullets to hold together. The other issue that is sort of at odds with lower friction from engraving is throat live. Obviously the more lands the smaller they are and the faster they will erode. The larger and taller they are the slower they will. I like the R or canted lands on the side as you really do not lose surface area as much for ease of engraving force. I also like a slightly taller land and a bit narrower as opposed to the flip. I have found it seems to work better for throat life. I also like non-opposing land and grooves (odd number) as I feel its deformation force is less but I have only tested this with strain gauge. It minor either way but I figure why not try to get every bit you can as it adds up. When you get up into the big long real ELR bullets etc I think things can change somewhat as other considerations come into play as even the smallest of things have a effect at 2 miles. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Different types of rifling and there uses.
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