30-06 grouping issue

[Stan the dirt farmer]

I’ve got a stock Rem 700, fairly new and I am pleased for a hunting rifle. Shooting 168gr Nosler BT around 1/2 MOA at 100 and holding well out to 400.
I wanted to try a heavier load. I loaded a 190gr Nosler CC with 54.5gr RL19 and 51.5 Win 760. Bothloads had nearly the same group. 1st shot was isolated 1&1/2” low and to the right from the second 2 shots which touched one another, any ideas?

 

[JMGlasgow]

Try a different bullet. My Rem700 hunting rifle loves the Berger 185 hunting bullets. I use Ramshot Hunter powder.

 

[Forward543]

Check load charge weight for sweet spot, then adjust OAL for accuracy.

 

[camocorvette]

What is your overall length?
Are you jamming the bullet in the caes or seating it long?
Thats 2 grains lower then published max for rl19 and same for win powder.

Whats the jump from ogive to lands?
Whats your throat erosion from a spec clambering?

There's a million things you could do. I'd start with a ladder test. With a adjustment in bullet seating on the charge weight of 51.5 of win760 (whichever powder you have more of; but 51.5 will stretch out a few more rounds then 54.5 of RL19)
Then 51.7, 51.9 52.1, 52.3, 52.5, 52.7, 52.9 With the same COAL you used for the last batch. (Im guessing 3.340)
If the groups suck still find the best group of those fired charge weights and stick with that charge weight and adjust bullet seating.

Still more variables to consider and change.

 

[DJL2]

195 TMK or 208 ELD-M would be my choice...and, in fact, I load both. I don't think I can squeeze the velocity I need out of the TMK to beat the ELD-M...but, accuracy first. One of those will likely shoot for you.

 

[GhostFace]

Yeah my custom 700 tolerates the 190 nosler CC. Submoa but not nearly as tight as the 208 ELDM or 210 smk. I tried various seating depths with the powders the rifle likes. It never shot as tight as the SMK or ELDM.

 

[JMGlasgow]

What powder are you using with the 210's

 

[lariat]

Ladder test. Establish the seating depth and keep it the same through the ladder. Once you find the node or nodes you can then tune in the seating.

 

[GhostFace]

What powder are you using with the 210's

H4350, IMR 4350 and IMR 4451 but primarily IMR4350. RL22/23 was okay but the others were one ragged hole and 1/2 moa at 1000 yards.

 

[JMGlasgow]

Speed?

 

[GhostFace]

2625 fps from a 22.5 1/10 Rockcreek barrrl at 75 degrees and 810 ASL

 

[JMGlasgow]

I have some H4350 so I'll try it. I normally use Hunter but that is nonexistent right now.

 

[MDof2]

:words: any ideas?

Don't try and analyze 3 shots.
Crono and shoot a reasonable sample size. 3 is not a reasonable sample.