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Discussion Starter · #1 ·
OK, Im going to have a new varmint rifle made and need a caliber. I have a rem SA with a 308 bolt and shilen 6mm 14 twist that will finish at 20in. It is a old ppc barrel that im going to have set back. Im thinking of a 6br or a 6x47 lapua. Does anyone have any other ideas. Looking to make this my long range shooter. Thank you, Ollie
 

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Long Range?

Looking to make this my long range shooter. Thank you, Ollie
Tall order - Are you set on a 6mm? What are you calling "long range".

With adjustable knobs on a scope, you will be able to send them with some effectiveness out there a good distance, but the 14" twist means a lighter bullet and the 20" length will shorten the piston and cost you 50 to 100 fps over the real long range 6mm's that are used for 1000 yd and the sort.

So, - need more info I guess.
 

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Discussion Starter · #3 ·
OK I have a 6.5x284 for my 800+ shots so lets say 600-. I have a leupold 6x18 with turrets that i will use. The 14tw is what im stuck with as that is what we use in short range br 100-200yds. Ollie
 

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6mmBR say

Berger's recommendation is a 62 gn Match bullet for a 14tw, which is probably what a lot of shooters use for 100-200 yds target.

If you can get 3300 fps (from reloadersnet) out of a 6mm BR w/ a 20 in barrel and 62 gn bullet, then you will have a trajectory that looks somewhat like the following at STP (text indexing would not play fair, but I think you can figure it out). The second column is velocity and the 3rd is energy. With over a 1000 ft-lbs at the muzzle, it should have plenty of killing power, but only 250 at 600 yds. Don't know how effective on anything but for prairie dogs, it should be effective. The last column is MOA adjustment which you will want to consider as for the scope you select.

Manufacturer: Shilen
Type: 62gn Berger HP


ATMOSPHERIC CONDITIONS:
Altitude (Feet):0
Cross Wind (Mph):5
Humidity:78%
Pressure (In Hg):29.53
Temperature (degrees Fahrenheit):59


Range Velocity Energy Path Drop Drift TOF Zero Adj
(Yards) (FPS) (FT-LBS) (Inches) (Inches) (Inches) (Sec) (MOA)

0 3300 1499 -1.63 0.00 0.00 0.000 0.00
100 2898 1156 1.27 -1.74 0.54 0.097 -1.21
200 2531 882 0.00 -7.65 2.31 0.208 0.00
300 2192 662 -6.74 -19.02 5.52 0.335 2.14
400 1880 486 -20.65 -37.57 10.47 0.482 4.93
500 1601 353 -44.79 -66.35 17.79 0.657 8.56
600 1359 254 -82.41 -108.60 27.69 0.860 13.11

If you try to get something with larger case capacity than a BR, then in my opinion you are burning a lot of powder in fresh air with that barrel. I don't know if there is much benefit. It is somewhat near the point of diminishing returns.

Hope that helps.
 

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Discussion Starter · #5 ·
Boy after 400yds that thing drops like a stone. Thank you for your feed back. I was leaning twards a 6br and launching 70gr ballistic tips. This would be for ground hogs and fox-coyotes. Ollie
 

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you might wanna consider a 6-250. Did the same thing a few years ago with a retired PPC barrel. If eggman see this thread maybe he can give you some velocities. Mine shoots pretty well with 58 & 65 Vmaxes. I've shot quite a few prairie dogs with it, but I usually go for quantity rather than quality (meaning long distance). Most of my shots are 200-300 yards.

Rick
 

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Boy after 400yds that thing drops like a stone. Thank you for your feed back. I was leaning twards a 6br and launching 70gr ballistic tips. This would be for ground hogs and fox-coyotes. Ollie
After 400 is where almost all long range shooting starts to enter the realm of finesse. Everything starts to get more challenging.
 
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