Getting the rifle to the weight you want can be done easily. The main factors in the weight would be the stock and the barrel.
My stock was quoted to me on the phone as being 2.2 pounds. However, when it showed up it weighed 3.2 pounds.
Apparently, the weight of the stock is quoted without the color gelcoat. Once the green was applied, the wieght went up.
If you were to go with one of their ultra light stocks with no gel-coat and ordered a carbon fiber barrel or a regular barrel in #5 or #6 contour, you would easily have a 338 super dooper whacker in the 8 pound range. [img]/ubbthreads/images/graemlins/wink.gif[/img]
I looked up some pricing on the carbon barrels, ouch!!!
I will probably settle on something in what ever barrel contour kirby decides on for stabilizing the 300gr uld and the 325gr FB bonded bullet. I wonder how much one of those A-3 stocks would weigh?????
Well that is a project for another day, right now instead of worrying about how to get a rifle light me and BJ are trying to build the heaviest one possible.
crazy world aint it.
Third Generation Shooting Supply www.3rdgss.com
"Products for shooters, by shooters" 1-800-522-3314
monday-friday 8:30-5:30 CST
Well, after five days of continous load development I have some numbers for those who are interested.
I have only worked with the 250 grain Lapua Scenars up to this point and have had them jammed into the leade as well as .030" and .040" off.
My barrel is 26.5" long.
My lot of H1000 is fairly slow, my lot of IMR 7828ssc is average, and my lot of RL25 is on the slightly quick side.
All groups at 100 yards in fairly blustery conditions all week.
All loads fired through a Oehler 35 chrono with 4' spacing between skyscreens and 10' from muzzle.
AV= average velocity
SD= standard deviation
3 shot groups
90 g RL25
91 gr RL25
92 gr RL25
93 gr RL25
87 gr. IMR7828ssc
88 gr. IMR7828ssc
89 gr IMR7828ssc
90 gr IMR7828ssc
94 gr H1000
94.5 gr H1000
95 gr H1000
95.5 gr H1000
96 gr H1000
Then I repeated a few of the really good ones to double check the load:
90 grains IMR7828
95.5 gr H1000
Then I tried 95.5 grains of H1000 and a different seating depth at 1000 yards and got an 8.75"x6.5" five shot group. Then this load shot a .787" group at 100 yards.
RL 25 was fast but eratic in group size.
IMR7828ssc shot vertical strings until at top end loads.
H1000 had consistently the best sd's and group size was more consistent.
But the fact that the largest group after trying 3 different powders was barely over an inch proves that the gun shoots pretty good so far and is not terribly finicky. This I attribute to good metal working by Kirby and Mike Rock, and good bedding by 7mmrhb. I'm pretty sure the shooter had nothing to do with it! [img]/ubbthreads/images/graemlins/wink.gif[/img]
Still tinkering and fine tuning the 1000 yard load. Will update soon.....
None of the loads listed above were "max" for pressure except the high load of RL25. I started on the low side of powder charges because I didn't know what the .339 caliber Scenars might do with pressures nor the 5r rifling.
As it turned out, neither one made much effect that was distinguishable.
I don't know if I will find max on any of them as far as pressures go because I really don't need top end speed with this bullet. WHat would separate max load from these loads might be another 100 feet per second and that is nothing at 1500 yards. I would rather have primer pockets that stay the same size then have an extra 100 fps.
Normally, when working up loads, I let the chrono tell me what pressures are and when the powder is not going to give me anything more. I load powder in small increments while watching what the sd's do. If the sd's go from say 15 to 10 to 7 to 3 and then start going back up to 10 or 15 or 20, then I know the sweet spot was passed up and I load the load with the sd of 3 again and re-test it.
SD is king at long range and velocity is what I look at last.
I tried a load at 1k that shot under half inch at 100 yards but had an sd of 14 and I couldn't hit the broad side of a barn at 1k. Vertical dispersion was probably 20".
By looking at the chrono as you fire an entire powder charge from low to high and reading between the lines so to speak, you can find the optimum load without having to do any "ladder test" or "OCW". When the chrono tells you that you've hit an internal ballistic sweet spot, then you re-test the exterior ballistics of the load at farther and farther distances to determine if the load is good. At least, that is how I do it. [img]/ubbthreads/images/graemlins/wink.gif[/img]