Home Forums Reloading Big Game Rifles Shrinking groups. Seating depth question?

For those who need background info, the original thread is here:

https://www.24hourcampfire.com/ubbth.../264_Win_Mag_140gr_Accubonds#Post3338453

So after a few trips to the range I am finding the 64.5gr of RL25 seems to be my best accuracy/speed combo. I am at a average of 3116 FPS.

I fired 7 consecutive rounds with the lowest @ 3102 FPS & 3126 FPS being the highest. All 7 rounds were just over a MOA, so I am thinking seating depth is my next step. I know I am just off the lands right now. I don't have a competition seater, so I don't know exactly how far off I am?

What is the best way to play with seating depth to find the sweet spot & tighten your groups up?

On another note a few mentioned trying 130gr bullets which I have also. I found 64gr RL25 to be the best with those as well. Average speed was 3123 FPS. These also grouped in almost exact POI as the 140's right around a MOA. Stepping up to 65gr RL25 caused groups to open up considerably (just like the 140's with 65gr) & averaged 3189 FPS with a top speed of 3211 FPS.

It's looking like the 3100 FPS range is where this rifle likes to shoot the best?

So advice on how to further tighten these groups would be appreciated.

Thanks.

You don`t need a comp seater to find the distance from the lands. It is simply a easy way to adjust seating depth in exact increments.
All bullets vary slightly in lenght from base to tip. The best way to adjust seating and return to the same lgt is with a bullet comparator .

You can adjust your regular seating die in small increments and reach any COL you want.

Have you ever tried Ramshot Magnum, I have had good results with my 264 when using the Barnes 120 gr ttsx. I use 68 gr with a winchester mag primer, getting groups of around an inch at 3260 fps, I could go up at least another grain but it works good for me as is.