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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help me build a 1 mile rifle...
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<blockquote data-quote="Buffalobob" data-source="post: 348655" data-attributes="member: 8"><p>A 7AM with a 200 gr Wildcat will stay supersonic to 2K at sea level depending on exactly the weather conditions. At 5000 ft altitude you can get to about 2500 yards. It will have enough killing power for an east coast whitetail or a small forkhorn mule deer or a doe. As has been said if a person goes that route then you have to have the second barrel chambered and handy to screw in when the first burns up. You have to have a large supply of bullets of the same batch. I bought five hundred wildcat bullets with my rifle and they sort into two groups by weight that is 0.2 grains apart. They were extraordinarily consistent but just a hair difference in final weight. Reject rate was 1%. This is the same reject rate for Sierra MK. All the Wildcats had been pointed so the tips were in better shape than the 308 SMKs I shoot in F-class</p><p></p><p>To give Brian Litz credit, G1 is a terrible math approximation at these distances. You will pull your hair out trying to get Exbal to work and fit to your data. You can go two routes with Exbal. One route is to say you really don't care about prediction accuracy under 1200 yards and just worry about the long range stuff. The other is to fiddle with the multiple BCs adjusting them and the velocity groupings until you get things as close as you can. I have about a 10% change in BC over 2K of distance.</p><p></p><p>One other thing Brian said that is true (at least for me) the center of your group that you shoot for drop data to calibrate your BC at 1500 yards on out to 2K is influenced severely by how good of a shot you are and how well you can dope out mirage and updrafts. This part will drive you crazy.</p><p></p><p>I shoot a 7AM but I never argue the killing efficiency of it versus the 338s at long range. While as Bud Martin showed with his non expanded 6.5 SMK it is not necessary to have bullet expansion to cleanly kill a deer at long range it is advantageous to have as big of a hole as you can get and that makes the larger diameter calibers more effective up front. With a better BC from some of the larger calibers you then have some additional advantages.</p><p></p><p>I briefly pondered buying some of the Henson 7mm bullets to see if I could get more speed and BC at the same time but was too worried that the testing would burn up my barrel and I do not have a spare laying around. Certainly, if a person was just beginning the process he would be wise to buy a box of those bullets and launch a few to see what the long range drops are like.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 348655, member: 8"] A 7AM with a 200 gr Wildcat will stay supersonic to 2K at sea level depending on exactly the weather conditions. At 5000 ft altitude you can get to about 2500 yards. It will have enough killing power for an east coast whitetail or a small forkhorn mule deer or a doe. As has been said if a person goes that route then you have to have the second barrel chambered and handy to screw in when the first burns up. You have to have a large supply of bullets of the same batch. I bought five hundred wildcat bullets with my rifle and they sort into two groups by weight that is 0.2 grains apart. They were extraordinarily consistent but just a hair difference in final weight. Reject rate was 1%. This is the same reject rate for Sierra MK. All the Wildcats had been pointed so the tips were in better shape than the 308 SMKs I shoot in F-class To give Brian Litz credit, G1 is a terrible math approximation at these distances. You will pull your hair out trying to get Exbal to work and fit to your data. You can go two routes with Exbal. One route is to say you really don’t care about prediction accuracy under 1200 yards and just worry about the long range stuff. The other is to fiddle with the multiple BCs adjusting them and the velocity groupings until you get things as close as you can. I have about a 10% change in BC over 2K of distance. One other thing Brian said that is true (at least for me) the center of your group that you shoot for drop data to calibrate your BC at 1500 yards on out to 2K is influenced severely by how good of a shot you are and how well you can dope out mirage and updrafts. This part will drive you crazy. I shoot a 7AM but I never argue the killing efficiency of it versus the 338s at long range. While as Bud Martin showed with his non expanded 6.5 SMK it is not necessary to have bullet expansion to cleanly kill a deer at long range it is advantageous to have as big of a hole as you can get and that makes the larger diameter calibers more effective up front. With a better BC from some of the larger calibers you then have some additional advantages. I briefly pondered buying some of the Henson 7mm bullets to see if I could get more speed and BC at the same time but was too worried that the testing would burn up my barrel and I do not have a spare laying around. Certainly, if a person was just beginning the process he would be wise to buy a box of those bullets and launch a few to see what the long range drops are like. [/QUOTE]
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