Home Forums Reloading Big Game Rifles Primers for 300WSM

Ive almost got the 62.8 load figured out. Actually 63.1 now. After using the 1x fired brass from my initial testing it seems the 63.1 got me back where I want to be.

Only had 4 shots on this one, target says 2.875 for COAL but the 62.8 load I pushed back to 2.850


Here is the x1 fired 62.8 and 63.1 loads, COAL back to 2.870(notice the velocity drop on .3gr more powder.....weird) the rest of the groups are different loads from trying the 180 NAB, which seemed to be easier to get to group. I took the 2 best 3 shot groups and went home and loaded up 5 rounds of those which are the 2 groups at the bottom left. I wasnt happy with those so I have 1 of each loaded up again to try later this week.



As it stands now, I have 2 180 TTSX loads( 5 rounds each) 63.1gr, one loaded 2.880 COAL and the other at 2.865
2 180 NAB loads,5 rounds, 61.9 and 62.5 again.

I use Federal magnum primers

Well, I think Im going to call it good, 63.1 180 TTSX, going to load 10 more and shoot them in 1 group. I suspect 8 out of 10 will be .7 and the others will push it to an 1in. I may mess with it a bit more later but Im going to start working on a 150gr load. Probably could have ended this sooner if I was only looking at 3 shot groups as there were many along the way that were sub .5. Even still, this load should work for any distance Id realistically shoot at game.

First 3 in 1 hole, pulled the 4th, almost go the 5th back in the same hole.

This is perfect. I might have to try some of your load data in my Sako!

In reality, I often wonder if my shooting or load prep may have caused some of the erratic groups that would have otherwise shown promise. Its one thing to have all the scattered, make me second guess myself when 2 go in 1 hole and the 3rd is an inch away. Especially if the chrono data says it was the same as the others.

For example, an identical load from yesterday, 63.1 but COAL 2890:




Here is the data from the Labradar on the above group

Looks like your rifle likes that TTSX a little farther off the lands unless maybe its you, like you said. That 63.1gr with the 2.875 COAL looks perfect to me. The variance is crazy low which is obviously really good. Are you allowing cool down time between shots? The barrels on every wsm I've ever owned heat up really quick.

I find it hard to shoot a "perfect" 5 round group. I have a Tikka 270wsm I can put 4 110gr TTSX's in the same hole at 100yds but for some reason that 5 one always ends up a 1/2" outside the rest. Very similar with the 300wsm I posted the pics of earlier in this thread.

The last 2 trips I took my temp gun. Fired one factory round to verify zero of the scope, took the temp and used that for the "cool down" temp. 67 the first day, 74 the next. After 5 shots i was at 110ish depending on where I pulled the temp. The chamber temp was cooler than part of the barrel I used for a baseline.

I have 10 empty cases left from my first 1x fired batch. Going to load them up at 2.875. Either shoot 2 5 round groups or shoot all 10 but let the barrel cool every 3 rounds.