cart SHOPPING CART You have 0 items

Discussion Forums

Search forums
Forum Index > Rifles general discussion > Help - accuracy troubles with chopped 308

Help - accuracy troubles with chopped 308

11 Apr 2016
@ 10:32 am (GMT)

Daryl Taylor

I have recently chopped my Remington 308 to 20 inches and put a suppressor on it.
It was shooting .75 MOA when full length and now has gone out to 1.5 MOA.
Its a 1 in 12 twist.
Have been searching through Nathans books to find an answer but still at a loss.

I have tried a complete clean of the barrel thinking it maybe over fouled.
My 708 and 7 mil mag I can shoot at .75 MOA so I dont think its me.
Shooting factory ammo and have tried as few different ammo brands as maybe the usual Hormady 150gr SST Superformance I normally shoot maybe now does not like the shorter barrel.
Tried with suppressor off just to see.
All with no more luck

Any help or suggestions welcome


11 Apr 2016
@ 06:13 pm (GMT)

Thomas Kitchen

Re: Help - accuracy troubles with chopped 308
hi Daryl
have a very close look at your muzzle just to check there wasn't a mistake made with the recrowning.

i think your barrel harmonics have changed so the ammo it liked before it doesn't like so much now try a heavier grain (165gr) ammo if you can,
its a little bit easier when you handload so if you have thought about getting into handloading this might be the excuse your looking for.
17 Apr 2016
@ 08:15 pm (GMT)

Daryl Taylor

Re: Help - accuracy troubles with chopped 308

I have had a look at the crown and it looks ok (although I am no expert).
I had previous not removed the copper fouling since I purchased the rifle so Im guessing its fired about 250 rounds. Since the complete clean I have fired about 12 shots through it and I can see no visible copper build up so one guess is that its a very slow fouling rifle and may take another few shots to foul sufficiently to improve accuracy.

17 Apr 2016
@ 10:43 pm (GMT)

Nathan Foster

Re: Help - accuracy troubles with chopped 308
Silly question but do make sure the suppressor collet fits tightly on the barrel. If there is even the slightest movement in the unit, it will effect accuracy.

Otherwise and as Thomas said, harmonics have most likely been changed so you may need to work up loads to suit.
17 Apr 2016
@ 11:14 pm (GMT)

john feyereisn

Re: Help - accuracy troubles with chopped 308
Are the action screws the propper tightness?


We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.