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Old October 7, 2012, 07:55 AM   #24
Senior Member
Join Date: December 13, 2009
Location: central Wisconsin
Posts: 2,324
You can't go comparing accuracy of reloads to factory ammo, especially in a new rifle. If you want to go down that path, I have an experience 100% opposite yours -- where my squared-and-trued .243 was printing groups smaller than 0.5" at 100 yards, within 15 rounds of the first shot down that barrel. (excluding the single test load fired by the gunsmith.) Untested reloads, factory ammo... everything. ...including factory loaded 100 gr Core-Lokts.

Every barrel reacts differently.
Every reload is different.
Reloads are not factory ammo.

As far as weight deviation goes....
Right around 3% is the industry standard for anything but premium bullets. With a 100 gr Core-Lokt, that means you'll see about 98.5 gr to 101.5 gr.
With a 150 gr Core-Lokt, that means you'll see about 147.7 gr to 152.3 gr.

But, even some premium bullets will still see deviation around 3%. Right now, I'm shooting an average group of 0.490" at 100 yards with 140 gr Nosler Partitions in .270 Winchester. They weigh 137.5 to 143 gr. (Nearly 4% deviation.)

I agree with this. I think the rifle makes all the difference.
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