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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
fastest 338 caliber?Build advice?
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<blockquote data-quote="Lightvarmint" data-source="post: 251777"><p>Kirby,</p><p></p><p>Hello again, I just ran the numbers on JBM at 82 feet above sea level using your new brass performance value at 3400 fps with the 300 SMK and compared it to the HATS out of my 338 Lapua Improved using Eddybo's BC of .910..... Remember, I have not tested the BC as of yet, but Eddybo has numbers that work in one of your rifles so we will use it for comparison........</p><p></p><p></p><p> 338 AM with 300 SMK</p><p> </p><p>Range----Velocity---kinetic energy--drift-----drop (400 yard zero) </p><p></p><p>0000-----3400------7699.2 ----------------- </p><p> </p><p>500-------2749.0---5033.2-----------8.8"------9.2" </p><p></p><p>700-------2513.9---4209.1----------17.9"-----41.8" </p><p></p><p>1000------2182.3---3171.7----------38.9"---133.4" </p><p></p><p>1500------1685.2---1891.4----------99.0"---444.7" </p><p></p><p>2000------1286.7---1102.6---------201.6"--1070.3" </p><p></p><p>2500------1043.9-----725.8---------354.6"--2227.5"</p><p></p><p>3000--------919.9-----563.6---------549.4"--4183.8" </p><p></p><p></p><p> 338 Lapua Improved with 265 grain HAT</p><p></p><p>Range-----Velocity--kinetic energy-drift-----drop (400 yard zero)</p><p></p><p>0000-------3245-----6195.0 --------------</p><p></p><p> 500--------2708.0--4314.5-----------7.7"-----9.7"</p><p></p><p> 700--------2510.6--3708.3---------15.7"----43.8"</p><p></p><p>1000-------2230.3--2926.4----------33.8"---137.4" </p><p></p><p>1500-------1804.7--1916.1----------84.2"---442.8"</p><p></p><p>2000-------1442.3--1223.9---------166.8"---1020.0"</p><p></p><p>2500-------1170.8---806.5----------290.0"---2021.5"</p><p></p><p>3000-------1011.8---602.3----------453.9"---3660.1"</p><p></p><p></p><p>So, as you can see, the 338 Lapua Improved using the HATS (with Eddybo's BC values) and using about 40 grains less powder, out performs the Cheytac-based case with 300 SMKs in every catagory starting at 1500 yards unless the cheytac-based case is using the HAT bullets. This is not too bad for the "little" Lapua case. </p><p></p><p>--Specifically, the wind drift is always in favor of the HAT load in the Lapua case. </p><p></p><p>--The velocity favors the HAT in the Lapua case starting at about 750 yards and then on out until it hits the ground.</p><p></p><p>--Kinetic Energy and drop favors the HAT in the Lapua case starting at about 1450 yards and continues until ground impact.</p><p></p><p>Based on this comparison model it looks like the 338 Lapua Improved with the HATS is a much better long range performer than the Cheytac-based case with the 300 SMKs and again it uses about 35% less powder to do it.............</p><p></p><p>Additionally, it seems that all the horse power advantage that is gained by the much larger case is all gone by 750 yards for velocity and 1500 yards for energy due to less efficiency of the 300 SMK.</p><p></p><p>So, as previously stated, unless the shooter with the Cheytac-based case is using the HATS, a "little" case such as the .338 Lapua Improved using the HATS will surpass its performance with much less powder...... </p><p></p><p>I guess the morale of all this number crunching is to use the HATS for LESS DRIFT, LESS DROP and MORE POP!</p><p></p><p>Lightvarmint</p></blockquote><p></p>
[QUOTE="Lightvarmint, post: 251777"] Kirby, Hello again, I just ran the numbers on JBM at 82 feet above sea level using your new brass performance value at 3400 fps with the 300 SMK and compared it to the HATS out of my 338 Lapua Improved using Eddybo's BC of .910..... Remember, I have not tested the BC as of yet, but Eddybo has numbers that work in one of your rifles so we will use it for comparison........ 338 AM with 300 SMK Range----Velocity---kinetic energy--drift-----drop (400 yard zero) 0000-----3400------7699.2 ----------------- 500-------2749.0---5033.2-----------8.8"------9.2" 700-------2513.9---4209.1----------17.9"-----41.8" 1000------2182.3---3171.7----------38.9"---133.4" 1500------1685.2---1891.4----------99.0"---444.7" 2000------1286.7---1102.6---------201.6"--1070.3" 2500------1043.9-----725.8---------354.6"--2227.5" 3000--------919.9-----563.6---------549.4"--4183.8" 338 Lapua Improved with 265 grain HAT Range-----Velocity--kinetic energy-drift-----drop (400 yard zero) 0000-------3245-----6195.0 -------------- 500--------2708.0--4314.5-----------7.7"-----9.7" 700--------2510.6--3708.3---------15.7"----43.8" 1000-------2230.3--2926.4----------33.8"---137.4" 1500-------1804.7--1916.1----------84.2"---442.8" 2000-------1442.3--1223.9---------166.8"---1020.0" 2500-------1170.8---806.5----------290.0"---2021.5" 3000-------1011.8---602.3----------453.9"---3660.1" So, as you can see, the 338 Lapua Improved using the HATS (with Eddybo's BC values) and using about 40 grains less powder, out performs the Cheytac-based case with 300 SMKs in every catagory starting at 1500 yards unless the cheytac-based case is using the HAT bullets. This is not too bad for the "little" Lapua case. --Specifically, the wind drift is always in favor of the HAT load in the Lapua case. --The velocity favors the HAT in the Lapua case starting at about 750 yards and then on out until it hits the ground. --Kinetic Energy and drop favors the HAT in the Lapua case starting at about 1450 yards and continues until ground impact. Based on this comparison model it looks like the 338 Lapua Improved with the HATS is a much better long range performer than the Cheytac-based case with the 300 SMKs and again it uses about 35% less powder to do it............. Additionally, it seems that all the horse power advantage that is gained by the much larger case is all gone by 750 yards for velocity and 1500 yards for energy due to less efficiency of the 300 SMK. So, as previously stated, unless the shooter with the Cheytac-based case is using the HATS, a "little" case such as the .338 Lapua Improved using the HATS will surpass its performance with much less powder...... I guess the morale of all this number crunching is to use the HATS for LESS DRIFT, LESS DROP and MORE POP! Lightvarmint [/QUOTE]
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