What works best first of all is concentration and then firearm and bullet come in next. I'm glad you asked.
In our first Shoot, an old boy with the 30 BR XP-100 was the high scorer with a 35/40 and he had plans to go on up to 40. He hasn't shot a 35 since. He loses his concentration, aparenty. Of course, it does rattle him when I tell him that we c-clamped all of his pigs to the rail so he can't knock them off. Nah, that's not it.
Anyway, two of my friends ordered barrels from Virgin Valley, went to the 100 yard line and printed 1/2" groups with their muzzle brakes and all. They have fired at three Shoots. They are competitors, but not absolute 40 shooters. 40 has never been achieved yet, but I do see it if one day everything comes together for one of us. I don't know why they haven't shot a 40 yet, except there is always some little thing like a sight setting, mirage change, wind or a boiling mirage. The spotter must read all of the changes and it takes a lot of practice. Without a good spotter, this type shooting will be very frustrating.
A bit issue is recoil. To shoot a 308 in a 15" Encore with a full house load is tolerable for 10 shots of so. During one of our shoots, you may shoot 6 sighters at each bank (4 banks) and then you will shoot 40 more rounds for a total of about 64 or more shots. Recoil is like body punches with a boxer. It doesn't knock hime out right away, but it is cumulative and it weakens performance. Ultimately, recoil will cause the shooter to duck and dodge. That works in boxing, but a minor movement causes a severe miss even at 200 meters.
That being said, what works best starts with a 7mm TCU with a 162 Grain Hornady bullet? I've tried 168 grain Sierra MKs in several TC 7mmTCUs and it doesn't work. The 7mm TCU will work great, but then the wind factor comes into play and more velocity helps fight the wind. Learn to read the wind and the Mirage and a 7mm TCU will do the job. The 7mmBR is another great one with mild recoil and it will get about 250 more fps that the TCU. (I have one on order from Van Horn in 7 BR). I already have a 15" Encore barrel, but I want a little more barrel for more velocity and a muzzle brake. I think the 7mm BR will be the ultimate for my game. That remains to be seen, though
I will list the top scores for the past 7 months below with the cartridge and bullet:
February 34/40 XP-100 30 BR 2000 fps 168 gr Corbin made bullet
March 38/40 TC Contender 7mm TCU 1860 fps 162 gr Horn BTSP
April 31/40 TC Contender 7X30 Bullberry AI 15" 2200 fps 162 Horn Amax
May No shoot
June 36/40 Encore 7MM-08 AI Virgin Valley 18.5" 2400 fps 162 Amax
July 38/40 TC Contender 7X30 Bullberry AI 15" 2200 fps 162 Horn Amax
August 34/80 38/40 TC Contender 7mm TCU 1860 fps 162 gr Horn BTSP
September 37/40 Encore 6.5mm WSSM Virgin Valley 18.5" 2600 fps 140 gr amax.
We set the Rams slightly hanging off the rail so they will go down with the handgun velocities of 1850 fps. Otherwise, we could not knock them down 100% of the time. However with my Encore 26" 7mm TCU and the Sierra 168 grain MK at 2170 fps will take the rams 100% of the time and even across court. Our range has 200 steel targets. The firing lines are lined up to shooting directly at the pigs and Rams and then the other line is lined up for chickens and Turkeys. Shooting across court is an angle of considerable degrees (I don't know for sure). With the rifle, I went to the left side of the firing lines and started shooting at Ram #10 which is at a diagonal cross court. The 2170 fps in the rifle takes the hard set rams 100% of the time.
I am off to load for tomorrow. I shoot two weekdays every week. It's a drug, ya know.
Harold Clark