Heavy 220 Swift bullets

[220yotekiller]

My 220Swift has a fast twist barrel, 1 in 14 to be exact, it shoots 55 gr. Ballistic Tips sub MOA. I picked up a batch of 62 gr. Sierra Gameking for a good price. Would these be to heavy to shoot well of of this rifle?

 

[EastTNHunter]

That’s a slow twist barrel. Built for speed, not heavies. Only one way to find out, but Sierra made a SMP profile bullet specifically for 22-250s and 220s that had receding leades, and they were supposed to stabilize in the slow 1-14 twist rate range. Shoot them and watch for keyholing, erratic/poor accuracy, etc

 

[Bowmannate2000]

That’s a slow twist barrel. Built for speed, not heavies. Only one way to find out, but Sierra made a SMP profile bullet specifically for 22-250s and 220s that had receding leades, and they were supposed to stabilize in the slow 1-14 twist rate range. Shoot them and watch for keyholing, erratic/poor accuracy, etc

I've reloaded the sierra 63gr smp. They shot well in my 1-14 twist 22-250.

 

[Sheltowee]

The gentleman from Rocky Top is correct that the only way to know for sure is to shoot them, but this stability calculator can give you an educated idea: https://www.loaddevelopment.com/calculators/twist-rate-calculator/

 

[220yotekiller]

That’s a slow twist barrel. Built for speed, not heavies. Only one way to find out, but Sierra made a SMP profile bullet specifically for 22-250s and 220s that had receding leades, and they were supposed to stabilize in the slow 1-14 twist rate range. Shoot them and watch for keyholing, erratic/poor accuracy, etc

you are right it is slow twist, serves me right for trying to think to late in the evening lol.