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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 SIN Testing
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 518362" data-attributes="member: 505"><p>Real close to having what I want with 85 grains of RE-19 and the 225 CE bullet. A five shot group had 9 fps velocity spread from 3157-3166 fps using federal 215 match primers. The group was under 3" at 600 yards. Extreme wind today so hope to shoot in the morning and stretch it out a little further. I haven't played with bullet seating yet. The bc on the bullet seems to be accurate so far. I will get some drop tests when I push it on out toward 1000 and check the bc. The 1000 yard drops with my 338-378 wby showed a .653 bc on JBM. It may be a little different with the 300 fps velocity difference. The 338-378 wby is incredible with this bullet at 3460 fps. But can't do it in a 6 pound rifle and 24" barrel which is why I like the 338 SIN.</p><p> </p><p>jskmtd, So far the 300 grainers have shown to hit in the 2700's out of a 24" barrel. This is a very efficient cartridge design so I doubt you will gain much with a long barrel. My guess would be 15-20 fps per inch. At that a 30 inch barrel should come close to 2800 fps. The big plus of this cartridge is that it does extremely well in short barrels because of utilizing faster burn powders that get more complete burn in the short barrels. You do not get the big fireball muzzle blast of turbulence out the end of the barrel therefore increasing accuracy in a short barrel. As you go up through the RUM, lapua, and 378 wby cases slower burning powders are needed for velocity performance in these larger cases. With the slow powders you need barrel length for optimum performance. With the 338 SIN utilizing smaller charges of faster burning powders you can still maintain top velocity and accuracy in a short barrel lighter rifle. A stiff 24-26 inch barrel shooting 300 grainers in the 2700's with great accuracy would be a nice rifle. I think a 26" #5 barrel would be extremely accurate with an accuracy load in the 2700's. You would need no modifications to your savage action for it to be a repeater since it is such a short case.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 518362, member: 505"] Real close to having what I want with 85 grains of RE-19 and the 225 CE bullet. A five shot group had 9 fps velocity spread from 3157-3166 fps using federal 215 match primers. The group was under 3" at 600 yards. Extreme wind today so hope to shoot in the morning and stretch it out a little further. I haven't played with bullet seating yet. The bc on the bullet seems to be accurate so far. I will get some drop tests when I push it on out toward 1000 and check the bc. The 1000 yard drops with my 338-378 wby showed a .653 bc on JBM. It may be a little different with the 300 fps velocity difference. The 338-378 wby is incredible with this bullet at 3460 fps. But can't do it in a 6 pound rifle and 24" barrel which is why I like the 338 SIN. jskmtd, So far the 300 grainers have shown to hit in the 2700's out of a 24" barrel. This is a very efficient cartridge design so I doubt you will gain much with a long barrel. My guess would be 15-20 fps per inch. At that a 30 inch barrel should come close to 2800 fps. The big plus of this cartridge is that it does extremely well in short barrels because of utilizing faster burn powders that get more complete burn in the short barrels. You do not get the big fireball muzzle blast of turbulence out the end of the barrel therefore increasing accuracy in a short barrel. As you go up through the RUM, lapua, and 378 wby cases slower burning powders are needed for velocity performance in these larger cases. With the slow powders you need barrel length for optimum performance. With the 338 SIN utilizing smaller charges of faster burning powders you can still maintain top velocity and accuracy in a short barrel lighter rifle. A stiff 24-26 inch barrel shooting 300 grainers in the 2700's with great accuracy would be a nice rifle. I think a 26" #5 barrel would be extremely accurate with an accuracy load in the 2700's. You would need no modifications to your savage action for it to be a repeater since it is such a short case. [/QUOTE]
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