I have a newer fn Winchester model 70 I have pillar bedded put in a timney trigger and had a pacnor super match barrel fitted and chambered with a 308 bisley reamer in the factory featherweight contour. I'm getting 1-1.5 moa with 168 fgmm and have worked up a 1 moa load with 168 Berger classic hunters and 4064 powder. Was kind of disappointed in the accuracy and was wondering if this is on par for this skinny of a barrel.
Expected accuracy of featherweight contour
- Thread starter markg208
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Bob Wright
Well-Known Member
How many rounds down it?
I have experience with a 1980's model 70 featherweight in 270 Win. It shoots 3 in a row around 5/8". A Remington SPS in 30-06 with a sporter contour will shoot a .5 but at round 4 it starts climbing.
Is yours stringing vertically or spreading out any direction?
Also is the barrel free floated or does it have the pressure point at the end of the stock? If it does, that might need to disappear.
I have experience with a 1980's model 70 featherweight in 270 Win. It shoots 3 in a row around 5/8". A Remington SPS in 30-06 with a sporter contour will shoot a .5 but at round 4 it starts climbing.
Is yours stringing vertically or spreading out any direction?
Also is the barrel free floated or does it have the pressure point at the end of the stock? If it does, that might need to disappear.
350 rounds down it now. Barrel is free floated all the way to action (I taped it where you see bedding in first couple inches of channel) vertical is very tight groups are strung horizontally
Bob Wright
Well-Known Member
Then I would start playing with seating depth on handloads. Vertical dispersion means you're good on velocity. Find your lands with the bullet you're using, then start at .010 off, then .030 and continue until this tightens. Then fine tune depth from there in .005 or less increments. See if that helps.
Are all 350 rounds with IMR 4064, or have you tried any other powder?
I have a couple rifles with featherweight barrels that group well. The barrels heat quickly, so go slow shooting groups. I also find they are more sensitive to proper torque of the action screws.
waveslayer
Well-Known Member
You have a Barrel that heats up quickly. Stick to five shot groups but let the barrel cool between shots. How quickly are you firing? What Twist rate is your rifle? What are the Temps when you're shooting? I'd try using Varget powder, have you played with primers?
I'm letting the barrel cool several minutes between shots and I was going to try varget next actually.
I haven't played with primers and the barrel is 1-11 1/4 twist
What are you torquing you're screws too? Is you're rifle pillar bedded?
The hand loads are. The others were factory ammo.
