Most accurate .277 bullet in 1:8 twist Shaw barrel 270 win, hunting?h

[K.E.C. Darkside]

With the 8twt, I would recommend
Berger 170gr. They shoot very well in my gun. If you haven't been cleaning the new barrel regularly through the first 100 shots
I have always had good barrels from Shaw. But most took 100 to 150 rounds to settle in. Another good bullet is Nosler Accubond and there Ballistic Tip.
Hornady SST work well.
Hope this helps.

EDIT- H- 4350 or IMR

 

[Lenny Foffa]

150 Grn Accubond LR worked very well in my custom 270 Win. with 29 inch heavy Hart barrel with an 8 twist and long throat . I used H 4831SC to try it out at 300 yards. I was very pleased. I have 170 Grn Bergers in 277 . but have not shot them yet !!!

 

[VTbluegrass]

My 270 from the 70s shoots everything ok about 1.5". They don't look cool as three shot groups but when you can put a whole box of corlokt 150s into that 1.5" it's pretty dang impressive. But it kinda shoots everything good enough. Until you mess with seating depth. I put Berger VLD or Nosler 150 ballistic tips and ABLRs out near the lands over RL23 it comes alive and it starts printing .75 clover leafs.
1) Play with seating depth of the current loads
2) Try a classic load 130gr bullet over IMR or H4831
3) Try Bergers or Hammers I haven't found a rifle that wouldn't shoot them, only using ABLRs instead of Berger's right now because I last time I bought 270 bullets was the Covid shortage and they were available and 150 VLDs were not when I needed them.

 

[Rflshootr]

The 2 things that come to mind........If it shot good at the beginning, the velocity may have increased. I would try loading 5 rounds at 1 grain less powder and 5 rounds at .5 grain less powder and try them out.
The 2nd thing, is bedding. If it only shoot 1" with a custom barrel, I'd have it bedded.

 

[Bullbuck]

Berger 130 grain or 140 grain classic hunter

 

[X'n Tex'n]

The 2nd's are turds. Throw them away, or, at most, use them for fireforming brass.

140 Berger HVLDs are available, as well as 140 classic hunters. The VLDs are good target and hunting bullets.

Do some ladder testing with 4831sc, you'll find several accuracy nodes.

Clean barrel between bullet types (ie copper solids vs cup/core)

 

[Krosebil]

As others have mentioned the 130 Berger bullets have always shot well in my 270 win above H4831SC. You will need to determine bullet contact point and mess with bullet jump but that should work for you. Best of luck!!

 

[fmuguira]

Try the 170 Berger and 165 Sierra; both should like that 8 twist.

Get some velocities while you re shooting so you know if loads are reasonable pressure wise. I would try .010-.030 off the lands. If it still doesn't shoot start trouble shooting rifle as someone mentioned. Bedding, barrel/stock interference, scope, scope mounting.

Assuming you ve kept that new barrel relatively clean regarding fouling; both copper and carbon ?
Good Luck

 

[Byrdman13]

I've been shooting the 165ablr in my factory 7.5 twist x bolt. Shoots .75" groups but not an easy bullet to load. Was really finicky finding a load. Haven't tried any other bullets yet. Going to start load development for the 140 btsp interlock soon for a cheaper whitetail bullet.