jedagi
Junior Member
From Northeast Texas. Shooter and hunter
Posts: 15 
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Post by jedagi on Oct 10, 2017 19:17:33 GMT -8
Im thinking of buying a primary arms ffp 4x14 Orion scope with acss reticle. It's reticle is designed for 223/308. I have a 6.5 Grendel with a 20" BHW barrel. I hear the strelok pro app can calculate this cartridge and show the bullet impact points for this reticle. I'd like to know how close it will match up with Hornady 123 eld and sst ammo that has a BC of .510 and 2580 fps. I don't know exactly what velocity this ammo runs out of my rifle but the box shows 2580. I hate to give $13 for an app I will likely only use one time. If anyone has this app I would appreciate it if you could send me the results of this cartridge/scope combination.
Thanks
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Post by GLSHOOTER on Oct 10, 2017 19:40:06 GMT -8
Im thinking of buying a primary arms ffp 4x14 Orion scope with acss reticle. It's reticle is designed for 223/308. I have a 6.5 Grendel with a 20" BHW barrel. I hear the strelok pro app can calculate this cartridge and show the bullet impact points for this reticle. I'd like to know how close it will match up with Hornady 123 eld and sst ammo that has a BC of .510 and 2580 fps. I don't know exactly what velocity this ammo runs out of my rifle but the box shows 2580. I hate to give $13 for an app I will likely only use one time. If anyone has this app I would appreciate it if you could send me the results of this cartridge/scope combination. Thanks Two issues. No reticle on any scope is ever dead nuts. Put ten boxes of whatever 223/308 through the rifle and some will be close and some will not. On many occasions in my career I've shot twenty 308 rifles on the same day using the same lot of Federal Gold Metal Match. All the same barrel length and I saw as much as 150 FPS variation. Real world proof that one size won't fit all. To add to the speed issue addressing the variation in bullet weights means there is no possible way for that reticle to be dead nuts with "all" 223/308 loadings. A 40 gr to a 77 grain 223 is vastly different as is a 110 to 220 grain load in the 308 and once again box to box gun to gun those loads will vary. Issue number two is quite simply without an actual speed established no reticle will work by mere application if math. To make matters worse those BC numbers will vary all over the map based on environmental conditions. Trust me a company will always hedge on the high side on a BC. Those big numbers add up to bigger sales. The only way to make it work in real life is to go shoot the ammunition at the given ranges. This would allow some reverse engineering via combination of drop and real world starting speeds. Box numbers are neat but not always real. I recently shot some 17 WSM with listed speeds. Four versions, four speeds and every one exhibited higher speeds than listed. Highly unusual but not unheard of. In most CF ammunition I routinely see slower than advertised speeds. Once you get it shot let us know how that APP works out. We will all learn something. Greg |
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