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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Least fussy mono-metal bullet?
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<blockquote data-quote="Northkill" data-source="post: 2354710" data-attributes="member: 110890"><p>MV 3,665 fps. as per LabRadar with 106 gr RL-33. Had it up to 3766 or so with 108 gr, but that was too hot for summer. 107 gr at 3,711 could have worked, but we dropped back to 106 where it seemed more consistent in grouping and less prone to over-pressure in warmer temps.</p><p></p><p>The way drops held out, we had to increase the BC a little out to about 400 yds... Took some time, but here's some pics. Sorry the deer were not washed prior to photos.</p><p></p><p>My theory is that at these velocities the impact "splash" and tissue displacement (cavitation) is incredibly dramatic. Lots of tissue gets stretched, torn and forced around violently. Chest impacts with these super-velocity rounds cause a hyper-inflation of the chest cavity which results in the shoulder separation, ribs splitting, gut splitting without being hit, diaphragm tearing, and also why we see steam or gas being blown back out of the entry and exit holes like I did. At this level, I doubt there is much to be done to stop this other than going up in bullet weight with lower velocity - like a 170 Cayuga or 177 Hammer maybe since Badlands does not offer a heavier option for an 8 twist.</p><p></p><p>Deer #1 @ 300 yds - entrance well behind shoulder - impact on deer's left side - 3,200 fps - 2 holes came out the front, one on each side of the brisket - both shoulders separated but impact side was all but falling off. Literally no lungs left. Heart in tact. Front of stomach torn & some contents pushed back out the entry. Liver and other internals lacerated/torn. Severe bloodshot on exit side rib cage - likely from cavitation pressure.</p><p></p><p>Deer #2 @ 400 yds - entrance caught rear of left shoulder (deer's left side) - 3,030 fps - huge impact hole - impact side shoulder was separated bad - exit shoulder had slight separation - less bloodshot on exit as compared to doe #1 - heart was completely sheared in half (half gone) - lungs were lacerated - liver has a small slit/split - general internal mess similar to doe #1 - saw steam or gas blow out about 5' or more on impact side and a little on exit side.</p><p></p><p>No frags found on either animal. (Last photo shows 6.5 Creed vs 7-LRM vs 7 Allen Mag for reference.) </p><p></p><p>I'll need to do more testing, but my initial experience has been showing 0.64 MOA at 100 & 200 yds, but when I stretched it out to 1,002 yds, last Thurs, the only 2 groups I shot were 2.5" or less - and that was in 5-6 mph wind. Hard to explain. Possibly something to Kirby Allen's words? <em>"These hyper performance rifles with long bullets and very high velocity just need more range for the projectiles to 'go to sleep', if you will. This is when the bullets fight off the effects of the rifling and spin true around their center of balance. Until this happens there is some amount of yaw in the bullet. Most feel if a rifle will not shoot 1/2 moa at close range it will never do that at long range. There may be some truth to that using smaller chamberings with more conventional bullet designs, but that is certainly not the case with these hyper performance rounds." </em></p></blockquote><p></p>
[QUOTE="Northkill, post: 2354710, member: 110890"] MV 3,665 fps. as per LabRadar with 106 gr RL-33. Had it up to 3766 or so with 108 gr, but that was too hot for summer. 107 gr at 3,711 could have worked, but we dropped back to 106 where it seemed more consistent in grouping and less prone to over-pressure in warmer temps. The way drops held out, we had to increase the BC a little out to about 400 yds... Took some time, but here's some pics. Sorry the deer were not washed prior to photos. My theory is that at these velocities the impact "splash" and tissue displacement (cavitation) is incredibly dramatic. Lots of tissue gets stretched, torn and forced around violently. Chest impacts with these super-velocity rounds cause a hyper-inflation of the chest cavity which results in the shoulder separation, ribs splitting, gut splitting without being hit, diaphragm tearing, and also why we see steam or gas being blown back out of the entry and exit holes like I did. At this level, I doubt there is much to be done to stop this other than going up in bullet weight with lower velocity - like a 170 Cayuga or 177 Hammer maybe since Badlands does not offer a heavier option for an 8 twist. Deer #1 @ 300 yds - entrance well behind shoulder - impact on deer's left side - 3,200 fps - 2 holes came out the front, one on each side of the brisket - both shoulders separated but impact side was all but falling off. Literally no lungs left. Heart in tact. Front of stomach torn & some contents pushed back out the entry. Liver and other internals lacerated/torn. Severe bloodshot on exit side rib cage - likely from cavitation pressure. Deer #2 @ 400 yds - entrance caught rear of left shoulder (deer's left side) - 3,030 fps - huge impact hole - impact side shoulder was separated bad - exit shoulder had slight separation - less bloodshot on exit as compared to doe #1 - heart was completely sheared in half (half gone) - lungs were lacerated - liver has a small slit/split - general internal mess similar to doe #1 - saw steam or gas blow out about 5' or more on impact side and a little on exit side. No frags found on either animal. (Last photo shows 6.5 Creed vs 7-LRM vs 7 Allen Mag for reference.) I'll need to do more testing, but my initial experience has been showing 0.64 MOA at 100 & 200 yds, but when I stretched it out to 1,002 yds, last Thurs, the only 2 groups I shot were 2.5" or less - and that was in 5-6 mph wind. Hard to explain. Possibly something to Kirby Allen's words? [I]"These hyper performance rifles with long bullets and very high velocity just need more range for the projectiles to 'go to sleep', if you will. This is when the bullets fight off the effects of the rifling and spin true around their center of balance. Until this happens there is some amount of yaw in the bullet. Most feel if a rifle will not shoot 1/2 moa at close range it will never do that at long range. There may be some truth to that using smaller chamberings with more conventional bullet designs, but that is certainly not the case with these hyper performance rounds." [/I] [/QUOTE]
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Least fussy mono-metal bullet?
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