Rocky

[Catfish]

The 6 BR is the most used round by the bench rest shooters at this time. It probibly has alittle edge in accuracy if you want to build a bench rifle. If your just going to build a hunting rifle I would go with eather the .243 or the 6mm. Redding dies for the 6BR Start at abt. $44 a set, brass runs abt. $ .50 ea. If your going to varmint hunt with it what you lose in max. point blank do to its slower velosity will cost you far more than what you gain in accuracy. To figure the increase in velosity you get when you go with an Ackley Imp. round it very simple. The percentage of increase in velosity is 1/2 the percentage of increase in volume. With the .243 for example, you can get 3,100 fps with the parent round. So what if you AI it??? Your parent case has a capasity of 54 gns. and the imp. has a case capisity of 57 gns. for an increase of abt 5.5%. 1/2 of that is 2.75%, your increase in velosity, so you would expect your .243 AI to push a 90 gn. bullet at abt. 3,272 fps. You normaly get an extra 5 yrds. of max. point blank range for ea. 100 fps. so it would increase your max. point blank range by abt 8.6 yrds. According to the Serria manual with their 90 bullet your max point blank ranges are as follows. At 3,100 fps. - 285 yrds. at 3,200 fps - 290 yrds. and at 3,300 fps - 300 yrds. Looks like my rule of thumb holds pretty well.