308 Vs 6,5x55, 300 yards.

[Northman]

I am wondering, is there any bullet fired through a 308 Win, that can compete with a 6,5x55 shooting

144 Sierra at 2600fps
140 Sierra at 2650fps
123 Sierra at 2800fps

with a max range of 300yards?


I have a 308 with a 27" barrel.

 

[TonyR]

I can only speak directly to the Berger 185LRBT Juggernaut but I was able to get them going 2600 fps+ with a 26 inch barrel. They have a higher BC than any of the 6.5 bullets you mention and at those speeds, the 185 should shoot inside the 6.5 s and punch a bigger hole which matters a lot in 300 yard score shooting. My throat is long enough to seat the 185s out in the neck. They shoot fine in a 1:12 twist. It would be a different story with a 6.5X55 Improved where the heavies can get to over 2900 fps even in a short barrel and into the 2950 range with a longer barrel.

 

[RStewart]

Berger 155.5 FB- 2995 fps
Sierra 155 (2156)- 2996 fps
I have a 30" 1:12 twist barrel.

 

[stool]

yes....but the 6.5 swede was miles ahead of the competition for years.
and your numbers are low...
using 4350 and a 27" as your 308, a 139 lapua does 2800 fps....not the 2650 you list for a 140.

and in a 308 win a siera 135 mk will do almost 3000 fps from 27" with n140...probably more.
and a 155 mk will do 2900......................

I am wondering, is there any bullet fired through a 308 Win, that can compete with a 6,5x55 shooting

144 Sierra at 2600fps
140 Sierra at 2650fps
123 Sierra at 2800fps

with a max range of 300yards?


I have a 308 with a 27" barrel.

 

[Exercion]

My first question is: compete how? Group size? Scoring? Are you asking for a ballistic comparison? Next would be why the Swede is being handicapped with low velocity? If the rifle is a modern action, with a reasonably decent length barrel launching the 140 class bullets at 2800+ is very easy.

Doing a comparison of cases:
308 case capacity 56gr H2O
6.5x55 case capacity 57.9gr H2O

Sierra bullet BC's:
123gr Matchking 0.510
140gr Matchking 0.495
142gr Matchking 0.595
There is no 144 from Sierra

I do not load 308's so I am not familiar with the bullet choices beyond 175gr Matchkings, but I did look up the BC an earlier poster mentioned, the Berger 185 and it has a BC of 0.560. Close to the 142, but I'd have to wonder if the smaller case can drive the heavy bullet as fast as the 142 can be launched from the Swede.


Eric

 

[Drop Port]

I am wondering, is there any bullet fired through a 308 Win, that can compete with a 6,5x55 shooting

144 Sierra at 2600fps
140 Sierra at 2650fps
123 Sierra at 2800fps

with a max range of 300yards?


I have a 308 with a 27" barrel.

Compete how? BC is not a factor at 300 yards

 

[PRECISIONWELDING01]

A 308 will compete with anything on the planet as long as the shooter turns the knobs. My 185 running 2830-2850 is super competitive .good shooting to you

 

[Laurie]

A 308 will compete with anything on the planet as long as the shooter turns the knobs. My 185 running 2830-2850 is super competitive .good shooting to you

Exactly! In equivalent rifles with modern state of the art bullets and using the MVs the pair are capable of in a modern action with good brass, there shouldn't be anything between them at all at this distance as they're both inherently accurate designs.

The 6.5 will produce less recoil though with a 140 than a 308 with say the 185gn Juggernaut for the same weight rifle, so the average competitor may be able to shoot it more consistently over a greater number of shots, especially off the bench. (But then again, the 6mm BR and Dasher produce even less recoil and are proven match winners in 300 to 600yd BR!)