Large group size

[Idaho Lefty]

It looks like you didn't get much new information after the first five or so.

When I get Group's Like that with, the First couple of, Shot being,.. a Bit "Out" ,..
That,Tells me that, I HAD a "Lack of Attention" ( Bad sight Pic. as, I'm NOT Focused or, a quick, Trig. squeeze ) or, too Much, Forend Pressure on the rest.
Then, maybe, I relax and,. Free Recoil, the Rifle with, a bit Looser, Hold ?? ( And THEN, they All go, In the "Right spot",.. after, that ! ).
IMO,. the .300 PRC, NEEDS More Barrel length to Stabilize, those,. Big Long, Bullets and Burn, most of, the Powder.

 

[Joefrazell]

When I get Group's Like that with, the First couple of, Shot being,.. a Bit "Out" ,..
That,Tells me that, I HAD a "Lack of Attention" ( Bad sight Pic. as, I'm NOT Focused or, a quick, Trig. squeeze ) or, too Much, Forend Pressure on the rest.
Then, maybe, I relax and,. Free Recoil, the Rifle with, a bit Looser, Hold ?? ( And THEN, they All go, In the "Right spot",.. after, that ! ).
IMO,. the .300 PRC, NEEDS More Barrel length to Stabilize, those,. Big Long, Bullets and Burn, most of, the Powder.

It's a 9 twist. It's definitely stabilizing the 200 bergers. It even stabilizes the 245 bergers. Powder burn. Who knows but it really doesn't matter as long as it does what it needs to. I'm pretty sure it's getting a complete burn.

 

[Idaho Lefty]

The Group, look Fine after, the first couple of, shots. I have, the SAME "issue's" at Times ! For Me, it's usually, a "Lack of, mental Focus", just before "pulling" NOT, "squeezing", the Trigger, slowly.
And, sometimes I Hold the Rifle, with too much, forearm, Pressure.
Agree that, More rounds needed to Be, Fired to Be,.. "Sure" or, you could have,.. overlooked, a Good Load !
I Do worry about, Un-Burned Powder, Filling Up, the Can ( Keep your Eyes on THAT, possible issue ).
We Like, our, 24" Braked, Magnum Rifles,. .270 WSM, 6.5 and, 7 PRC's

 

[Idaho Lefty]

@ Joe F.,..
I found that,. If, I did, a few, "Dry fire shots" to, get used to, each of, my rifles, Triggers and Focused on keeping the Cross Hairs "centered" on, the Target, before, my Group Testing, it seemed to, make Me, "pay attention" ( Focus ) and Shoot, Better / tighter, group's.
I frequently Test sight, using 2 Rifles, on / Off to, Keep the barrels Cool,.. 2-3 shots,.. Switch rifles.
But, Group sizes, were usually Bigger, by doing it, "This" way, so Found it Best to, just Let Rifle "Cool" between every, 2-3 Shots.
Got any accuracy Tip's that,. You, can share ???