Well, that is strictly a hunting load, and again 1 fps ES and 1/2 inch groups at 200 yards with a 16x scope, thats pretty much as good as I am. It places 5 touching at 100 yards. I tried everything but BR2 primers and only because the only BR primers I can find without ordering and paying hazmat are 210Ms. I got the best consistency and groups with RL17 with Fed 215 primers. I figure that likely has something to do with the pressure difference,to some extent at least. When just shooting I use the H4831SC load and it does about the same regardless of the primer I use.
Yeah using a 215 is almost like adding an extra grain of powder and a more erratic ignition, plus lapua cases are thicker and softer than norma cases, the normas will hold just a tid bit more. Jam those bergers in the lands and try 49-50.5grns Imr 4350 with 210m's or BR2s and I bet you can't see how many holes you left at 100yards until you see how raggedy the 3/8s hole is on the back of the target! That is quite a mean hunt load you got though, 1K deer and antelope nightmare!
Well as I mentioned in a previous post I was running 3020fps with a 4fps ES with 48.7grns Imr 4350, norma cases, CCI BR2s, and an average around 35lbs neck tension and jammed .005" in the lands on a 139 lapua scenar. I have hit 3176 with 51.5grns Imr 4350 but it started vertical so I backed it off for accuracy, went from 8" groups to 5" groups, so I guess the question is why use about 10 grns more powder to do the same thing?
How do you go about measuring that 35 pound neck pressure?
Watch your thoughts; they become words.
Watch your words; they become actions.
Watch your actions; they become habits.
Watch your habits; they become character.
Watch your character; it becomes your destiny.
Funny you asked this question. I have been using h4350 and was getting good results but at 48g it was showing slight pressure and was only getting 2850 to 2863fps. So I borrowed a little retumbo from a friend using it in a 338 edge. 57g was showing some pressure so I dropped to 56.5 today which is almost a compressed load with 140 bergers. I am getting great groups and ES now and its down to either winchester(2993-3004fps) or 210m (3031-2991fps) primers in lapua brass.
Is the Hodgdon data on the conservative side? I am working up with H1000 and Hornady 140gr sst and it sure does not look like Im going to get close to 2900 fps. Hornady says I should get to about 2700 with 52.5gr H1000 and that seems close to where I am at. I do have a 24" barrel, maybe longer barrels is how everyone is getting closer to 3000.