Rimfireboy Posted January 16, 2018 Report Share Posted January 16, 2018 I was interested in finding out if the cci A17’s do actually achieve 100fps more speed than other 17grain hmr ammo. My rifle has a short 15 inch barrel, so I know to expect slightly lower muzzle velocities than a longer barrel would achieve. I had six different bullets to compare, velocity only, not accuracy in this comparison. Anyway, here are the results...average velocities taken from five shots of each type. Winchester Varmint HV 2471 Reminton Premier 2513 Hornady XTP 20grain 2301 CCI TNT 2466 Federal Premium 2529 CCI A17 2571 The cci A17 were actually exactly 100fps faster on average, than the Winchesters. Quote Link to comment Share on other sites More sharing options...
7daysinaweek Posted January 16, 2018 Report Share Posted January 16, 2018 Hi RB interested to know how much accuracy was affected by the different velocities, were any of the velocities significantly lower taking into account your barrel length as said. I know many rifles like a certain brands over others. atb 7diaw Quote Link to comment Share on other sites More sharing options...
wymberley Posted January 16, 2018 Report Share Posted January 16, 2018 Well posted, RB. Did you by any chance record the individual velocities for each cartridge or did you just leave the chrono to give you the average? Quote Link to comment Share on other sites More sharing options...
Walker570 Posted January 16, 2018 Report Share Posted January 16, 2018 Did the bunnies notice the difference? Quote Link to comment Share on other sites More sharing options...
Rimfireboy Posted January 16, 2018 Author Report Share Posted January 16, 2018 8 minutes ago, wymberley said: Well posted, RB. Did you by any chance record the individual velocities for each cartridge or did you just leave the chrono to give you the average? I did write them down Phil, and the federals were by far the most consistent. Only varied by a few fps which surprised me. The others varied by about 20-30 fps either side the average. I know that they all give me acceptably good accuracy, with the 20 grain Hornady’s the best. However, I haven’t tested the accuracy of the A17’s yet. Quote Link to comment Share on other sites More sharing options...
Whitebridges Posted January 16, 2018 Report Share Posted January 16, 2018 Nice work RFB. Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted January 16, 2018 Report Share Posted January 16, 2018 What's the idea behind the extra 100 fps at muzzle .from the cci s ? Is it just the extra 20 fpe at muzzle or only the extra 8 fpe at 150 yds The 100 fps advantage reduces to a 70 fps advantage at 150 yds I guess if they are accurate and good value then why not .they at least would make up for the 15 inch barrel velocity drop . Quote Link to comment Share on other sites More sharing options...
Brad93 Posted January 18, 2018 Report Share Posted January 18, 2018 Do you know what you get out of the Hornday 17gn V Max? Box states 2550. Would be very interesting to see what you get out of a 15” barrel as I’ve got a 14” anschutz. Quote Link to comment Share on other sites More sharing options...
wymberley Posted January 18, 2018 Report Share Posted January 18, 2018 There's various of these kicking about all pretty much in agreement: https://www.bullberry.com/17-hmr-velocity-data Quote Link to comment Share on other sites More sharing options...
Brad93 Posted January 19, 2018 Report Share Posted January 19, 2018 That data is comparing the barrel tolerances more than the lengths. They're not factory barrels. Quote Link to comment Share on other sites More sharing options...
wymberley Posted January 19, 2018 Report Share Posted January 19, 2018 (edited) 43 minutes ago, Brad93 said: That data is comparing the barrel tolerances more than the lengths. They're not factory barrels. True enough. I just happened to have it handy as I'd recently used it elsewhere because of its clarity. It really depends on whether or not a reasonably accurate figure of a 4% reduction in velocity is sufficently precise for your needs. The only accurate alternative is to chrono your barrel Edited January 19, 2018 by wymberley Quote Link to comment Share on other sites More sharing options...
Brad93 Posted January 19, 2018 Report Share Posted January 19, 2018 I will get it chrono'd at some point. I can use a ballistic app a bit more accurately then. Quote Link to comment Share on other sites More sharing options...
Lloyd90 Posted January 20, 2018 Report Share Posted January 20, 2018 How much are the new CCI compares to the old ammo? Quote Link to comment Share on other sites More sharing options...
Pigeon Shredder. Posted January 20, 2018 Report Share Posted January 20, 2018 Paid £30 100 for a carton of 200, checked today and am on the last 50, l do use other makes as l have found no accuracy difference from make to make, or l'm just lucky! lf l get a chance this week will cronogragh them through my 16" CZ and post result for you. Quote Link to comment Share on other sites More sharing options...
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