Fast Twist --- Light Bullets

[Zero333]

I worked up a 243 load with 80 Berger's in the middle of the freezing winter. Load shot like a laser.
Once the outside temp went up just above 30 f, some of those bullets would not make it to the 200m target. 25% of them would disintegrate right after the 100m mark. And the groups at 100m were twice as big as when it was very cold.

I slowed down this load by 300 fps and groups shrank to what they were before, and no bullets blew up again.

This was in a 243win 8" twist 26" bbl.

 

[K22]

69 gr Bergers is what the guys here use in 8" twist Tikka's.
2" groups out @ 500 !

Thanks for the input and I might try these in the future however for the time being I'm pretty happy with the 60 Vmax's in my 8" twist Tikka.

 

[Homerange]

Thanks for the input and I might try these in the future however for the time being I'm pretty happy with the 60 Vmax's in my 8" twist Tikka.

I can find out more if you like.....the buddy that developed that load for his bro and bro in law was here again just yesterday getting some trigger time on his custom T3 Varmint in 6mm Rem.
It was originally a 22.250 in normal twist as back then Tikka couldn't/wouldn't see the sense in offering 22.250's in a fast twist....but now they do !
Anyways, for the long range varminting they were doing, the 69's out of the fast twist T3's in 223 were cleaning him up if there was even a tiny breeze as the 50's he was limited to were dancing all over the place.
So with the bolt face of a 6mm Rem being the same as 22.250 he rebarrelled it in the same Tikka profile and a match grade NZ Trueflite tube and it's shot lights out right from new.
Turned up here yesterday and dialed in the 700yd gong (~A4 size) and pummeled it 5 shots in a row.
It's shoots 105 G7 Bergers @3250 for 2000fps and 1000ftlbs at 750yds and good enough accuracy for 800+ yds rabbits......just don't feed it anything with Winchester primers when stoked that hard......if you value a clean bolt face !

 

[KevinThomas]

Short answer here; faster twists degrade accuracy with poorly made bullets that have concentricity problems. And those aren’t going to shoot particularly well even in their “ideal” twist barrels. In using good, well balanced and concentric bullets, the faster twists essentially have little or no error to magnify, and will shoot quite well, even when being spun faster than the need to be.

 

[Fotheringill]

Snoopy-

With all respect and the reasons for something happening or not happening, I was just relaying my experience. I am not shooting 55's out of that barrel or its replacement (1:7) again. I like the bullets on paper and preferably in .3 or less MOA. I gave away all 55's and 69's to a shooting pal and have not looked back.

 

[joed49]

You hit the reason I don't have but one fast twist barrel and that one is in an AR. I'm a varmint hunter and use light bullets where I hunt to avoid ricochets.

Few years ago I picked up a Savage 10FP in .223 for hunting use. The rifle had a 1:9 twist and could put the 69 gr bullets in one ragged hole as long as I did my part. But 50/55 gr bullets would only group to about 3/4". That rifle was so accurate I hated to sell it but it just didn't fit into what I wanted to use the rifle for.

I totally agree that you have to know the use and get a twist to match.