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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC ?? on 53 & 55 V-Max
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<blockquote data-quote="Trickymissfit" data-source="post: 496952" data-attributes="member: 25383"><p>first of all your in need of some powder. Beg borrow, or steal a can of H335, BLC2, and H322. This can be followed up with some 2015BR and 2230. Seat those bullets within .002" of the lands, if not just barely touching them. The Speer manual calls out 3031 with the 55 grain bullet, and 2015 are very similar burning rates. So where they come up with their data is odd to me. I'd be starting with something like H335. I shoot the 55 grain Vmax bullets out of a .223 all the time, but honestly with a 1:9 barrel I'd be moving into heavier stuff with a B/C around .35.</p><p> </p><p>I'm sorta bothered with your velocity verses the trajectory figures. If you have access to another chronograph, it might be worth doing a compairison. According to the curve your velocities are lower, or else your 300 yard targets are further out (I'm better the latter). Anyway I have had good look with BLC2 and H335 as well as H322. I shoot thru a 20" barrel for 3274 fps, and group in the mid fours on a good day. From a 26" barrel to a 20" barrel I lost about 75fps Next question; are your groups stringing vertically? If so put the bullet about .0015" into the lands, and try again.</p><p>stay in touch!</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 496952, member: 25383"] first of all your in need of some powder. Beg borrow, or steal a can of H335, BLC2, and H322. This can be followed up with some 2015BR and 2230. Seat those bullets within .002" of the lands, if not just barely touching them. The Speer manual calls out 3031 with the 55 grain bullet, and 2015 are very similar burning rates. So where they come up with their data is odd to me. I'd be starting with something like H335. I shoot the 55 grain Vmax bullets out of a .223 all the time, but honestly with a 1:9 barrel I'd be moving into heavier stuff with a B/C around .35. I'm sorta bothered with your velocity verses the trajectory figures. If you have access to another chronograph, it might be worth doing a compairison. According to the curve your velocities are lower, or else your 300 yard targets are further out (I'm better the latter). Anyway I have had good look with BLC2 and H335 as well as H322. I shoot thru a 20" barrel for 3274 fps, and group in the mid fours on a good day. From a 26" barrel to a 20" barrel I lost about 75fps Next question; are your groups stringing vertically? If so put the bullet about .0015" into the lands, and try again. stay in touch! gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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BC ?? on 53 & 55 V-Max
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