243 OCW test using H4350 Need opinions

[poke_53]

Ok first off this is the first OCW type test I have ever done and this is the first day I have ever shot this rifle. Max load for 243 with H4350 is 37gr. That is where I started considering I have read several posts and opinions on going up to 42gr with H4350 with no signs of pressure. I started with the 37 and worked my way up to 41.5 in .5gr increments. All loads were set at 2.78 OAL. Something happened to the 37 and 37.5 loads. They were really spread out and I couldnt find all the rounds. All loads showed slight ejector marks and bolt lift gradually increased but not engough to cause me to stop. I fired 5rds from each load. I did not have a crono to test velocity but I will soon. I am thinnking that I should go with the 40gr load. Any opinions or suggestions are welcome.

 

[bbutturff]

What bullet and primer did you use? If it were me, I would shoot the 40gr load on at least two more occasions before deciding it was the best. Could be you just got lucky.

 

[poke_53]

Sry that might be a vital part. I am loading hornady 105gr bthp using cci br primers.

 

[bbutturff]

Nothing wrong with that combo. Sierra says 39.6gr of H4350 with their 107gr Matchking BTHP so you're probably right where you need to be. Like I said before, send some more down range to confirm the load.

 

[poke_53]

So I shouldn't be worried about slight ejection marks right?

 

[backwoods83]

If you are using the new amp jacket 105 vlds seat them about .010" off the lands then somewhere around 42grns will be on par, if not try 43grns Imr 4350 or 47grns H4831sc, my guess from all the strays is its mainly a seating depth and neck tension issue judging from some vertical stringing. 2.78" oal is fine for a 95grn nbt but not a vld. Also I hope you have close to a 9 twist or faster.

 

[poke_53]

It is a 9 1/4 twist and my goal is to push them fast enough(3000) to stabilize them at distance.

 

[backwoods83]

9.25" is it a 22 or 26" savage? Your best bet is .010" off the lands or touching with H4831sc at about 47grns with Fed210M's.

 

[poke_53]

It is a savage 24" barrel. I'm gonna run some through the crono to see where I am at.

 

[backwoods83]

Must be a model 10 predator hunter, with a 24" pipe a 105 and 40grns H4350 I doubt you are breaking 2900fps.

 

[poke_53]

I am gonna work up some more and go from there. I know of a guy getting 3110fps out of a 24" barrel using 42gr of h4350.

 

[243Lapua]

Try this load. its what I use. 40.5 gr of H4831sc, 105gr berger vld, lapua brass, federal match primer. I have a 1/8 twist 243 barrel from brouhton, but its tight necked at .2.69. 5 bullets into 1hole.

 

[nicon06]

Hi,
My Hornady book says 41.0g max for 105 .243.

 

[moombaskier]

If you are looking for the OCW load you should be looking at the 40.5-41gr. load. The 40gr load shifts the point of impact and the 40, 40.5, 41.0 and 41.5 are all within 1moa. I would try 40.7 and seat the bullets +.005 and -.005 and see what those do. The whole concept of an OCW load is to be in the middle of a point of impact node so to speak. I would also shoot them at at least 200 if not 300yds. as well.