Velocity Question?

[rscott5028]

Careful now. I'm not advocating one way or the other.

I'm just reporting on the 20 shots I fired from one rifle with a 24" barrel.

I cut mine short just because I wanted to. I did consider 6.5x47, but I already had competition dies and lots of lapua brass for 6.5x284. And, I already have a 6.5x284 with a long barrel.

I'm just saying you should be able to get 2900-3000 fps from a 26" barrel with 140's and the right load.

As for QL... I suppose you mean QuickLoad which I hear people refer to a lot. I tried the demo and it's so cheesey that I didn't figure it's worth the price.

thanks,
richard

 

[rscott5028]

Austin,

You be the judge. Here's my limited perspective on the matter...
http://www.longrangehunting.com/forums/f19/my-first-build-72748/

I was just so excited when I got the pieces all together that I had to go shoot it. But right now I'm waiting on my brake to show up so I can install it, bed the action, and then do a proper load workup.

This was just warmup for a 6br that I have in the works with some top notch components and high expectations.

Best of luck!
-- richard

 

[Coyboy]

Okay thanks for all the help but here is what I got. I have a brand new custom brux 26" barrel on a surgeon action, bedded in a grey bull stock. The first day I started out with retumbo working 55grs up to max, lapua brass cci mag primers, 140gr berger vlds 2 thousands off the lands shooting through a chrono. It was about 60 degrees and cloudy with chrono 15' from muzzle.

55gr- 2,864, 2,799, 2,805

56gr- 2,867, 2,900, 2,836, 2,903, 2,875

56.5gr- 2,921, 2,893, 2,897, 2,898,2,905

57gr- 2,948, 2,939, 2,900, 2,902, 2,898.

Nearly all loads were under an inch at 100 yards, I waited a minute or two between each shot. In fact 56gr went into one ragged hole.

Since I wasnt getting very consistent velocity I switched to H4350 the next day.
Groups opened up to around 1.5" to under 1" with some.

46.5gr- 2,808, 2769, 2,770

47.5gr- 2,844, 2,839, 2,860, 2,878, 2,939

48.5gr- 2,914, 2,915, 2,911, 2,945, 2,920

49.0gr- 2,890, 2,898, with pressure signs so I quit.

I guess Im kinda lost what do you guys think I should do next? Play with seating depth, change primers, I noticed noone uses mag primers. This is the first time I have thrown a chrono in the mix and its added a whole new variable. What do you guys think?

Austin, Don't take to much stock in high spreads early on in a barrels life. Barrels do in fact brake in during the first 50-100 rounds and speeds will generally increase and level off at the 100 round mark. I usually reserve load development until I hit this point, and the starter load in a 6.5x284 is usually between 50-51.5 grains of H4831sc.

You won't believe it but when I started my 30" f-class gun with 51 gr of h4831 it shot at 2875 fps, that slowly increased to 2975 and caused me fits at the team state camp match last fall. I had 12 rounds thru that gun and put another 120 thru it during a match. Verticle climbed thru the first day, was a bit better on the second, dope from saturday was not the same as sundays.

I still use close to the same load, 51.3 just modified my seating depth and managed to take first in a 24 person field on Memorial day. with about 400 rounds down the pipe.

I have now backed my next batch of loads down to 50.6 as it is showing some pressure in the warmer weather.

 

[Autorotate19]

Okay will do. I think I found my load. 52grs of 4831 sc giving me a velocity right at 2,900 right now. Put three shots in one hole at 100 yards.

 

[rscott5028]

Okay will do. I think I found my load. 52grs of 4831 sc giving me a velocity right at 2,900 right now. Put three shots in one hole at 100 yards.

Nothing to be ashamed of there.

Let us know how it does at long range.

thanks!!