I’m gonna do some extra long range shooting before the ohio winter kicks in and its too cold to do anything outside.
I got to thinking why not try the 308? I usually run 175smks or 178amaxs out to 1k but l think maybe my borderline sane pressure level 155scenar load might fair a bit better, l know it will stay supersonic farther.
I’ve also considered rolling some 208’s, its a 26 inch barrel might be better, l dont know never messed with them. Or if you got any other bullet ideas, be my guest.
Anyways my questions are anyone have any experience in which bullet transitions from super to subsonic the smoothest? Also anyone have any load data for 208’s?
And yes l know it wont be easy, its just for fun while the 7wsm is resting.
No 308 is going to be supersonic at 1760. So, you need a bullet that goes transonic and remains stable.
Thus far, the only bullet I’ve used that does it is the 175SMK. I’ve run them to 1554yds, and they disperse in direct relation to the rifles capable accuracy and my wind reading ability.
I’ve ran them at distance from 2550fps on up to 2750fps… and the 175SMK gets it done.
I second orkans statement. The 175 SMK will remain stable while transonic. It really doesn’t matter at what distance it will become subsonic but how stable the round remains during the transition period.
As long as the round is stable and you have a good MV for your round, one can very accurately determine the trajectory of that round and come up with a very accurate ballistic table all the way to the ground.
I haven’t tested the berger… and at its price compared to the SMK… I won’t be. At those distances, the 308 isn’t an authority and will never be, regardless of bullet. So for screwing around and lobbing them out there, the 175SMK will get it done.
Secondly… I’d love to see you get 230gr of anything to a mile with a 308 out of a conventional rifle. You’d be looking at about 35 mils of elevation… and that is being very conservative.
At a conservitive 2000fps we are looking at 39.8 mils of elevation and it was only a sugestion, thats what this thread is suggestions. I didnt post to start another prove it to me discussion.
Even at 30mils up its a non-starter for anyone with anything less than a 60-80moa sloped rail.
If I WERE going to try one of the heavies to a mile in the 308… it would be the 208 Amax. At least then you could push it fast enough to make the trip with reasonable trajectory and its very high BC would help overcome the wind. One could probably do so with reasonable success if using a 30" 1:10 barrel and a hot load of varget. Yet it STILL would not do it with authority… even at 1000yds.
Shooting in the mountains of Nevada we are able to shoot to 1 mile and the 175 from a .308 will hit the man sized steel. The 175 SMK apparently passes thru the transonic zone with little disturbance.
Thanks for all the replies, looks like l will just stay with my original 175smk load (its already loaded hot enough that l’m not even gonna mess with it for these purposes, its not gonna get there much quicker anyway). lt was the most accurate but not the hottest load when l was ladder testing loads.
My goal is to make hits on a 3x3 square of plywood and depending on how that goes maybe a man sized target. Who knows everytime l get the time to get away for a day or two to do something like this its always so windy it not even possible (for me atleast). I’m hoping 5mph or under.
