| Mcleish |
| (.275 member) |
| 14/07/10 09:50 AM |
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Re: Woodleigh Hydro result
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Quote:
The Hydro with a BC of .450 - I'm having difficulty with that high a number. I would believe something in the range of .275 to about .330, though.
Not only the nose shape, but the bands on the shank are brutal to the BC. The bands create a lot of additonal drag - called parasitic drag due to the eddies in air movement they cause by each and every groove, nothing smooth as in laminar flow. Note the difference between the Barnes "X" bullets of old, the smooth ones, and the TSX now used. There is a huge drop in BC due to the bands, even though the TSX of the same weight is even longer.
Still, in a .35 Whelen, a good shot will not have difficulty with shots to 300 yards - even 350 yards. One merely needs to practise at those ranges. Shooting at 50 or 100 yards and reading drop tables doesn't cut it.
Hi Daryl appreciate your comments on the factors affecting the BC, as I stated in my earlier post I had no idea what the BC was for these projectiles, either do Woodleigh. I do however note that their Protected Point Projectiles have the highest BC per weight in the 35 cal. I know BC isn't everything, however given that a two projectiles have the same killing performance, I would always pick the one that will perform better in terms of ballistics.
I will revise the numbers for the above info. Daryl the purpose of this is not to presume that the drop tables are exact, in fact they are a very crude instrument. They are however the best one available to me to look at the shape of a trajectory and look at what is viable in terms of risk in making a shot. Gryphon did speak earlier of a "rainbow trajectory out of the Whelen", the numbers demonstrate otherwise. No one wants to be a cowboy with 20-30 inch holdovers, these are just not practical IMO, and not fair to the game you are chasing. Knowing the limitations of one’s firearm is important.
Ballistics Table in Yards 35 Whelen - Hydrostatic 225 gr., .275 B.C. www.hornady.com
Range (yards) Muzzle 50 100 200 300 400 500
Velocity (fps) 2620 2461 2308 2017 1750 1511 1307
Energy (ft.-lb.) 3429 3026 2660 2033 1530 1140 853
Trajectory (210 yd. zero) -1.5 1.4 2.9 0.7 -10.2 -32.4 -70.1
Come Up in MOA -1.5 -2.7 -2.7 -0.3 3.2 7.7 13.4
Ballistics Table in Yards 35 Whelen - Hydrostatic 225 gr., .330 B.C. www.hornady.com
Range (yards) Muzzle 50 100 200 300 400 500
Velocity (fps) 2620 2487 2358 2112 1880 1667 1474
Energy (ft.-lb.) 3429 3090 2778 2227 1766 1388 1085
Trajectory (217 yd. zero) -1.5 1.4 2.9 1.0 -8.6 -28.2 -60.4
Come Up in MOA -1.5 -2.7 -2.8 -0.5 2.8 6.7 11.5
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