I measured the twist in my 1885 swift. Its stated that its a 14" twist ,but I measured it at 13" twist and it shoots the 55gr Nosler BT very well. So wondering if it will shoot Sierra 55gr SBT well ? I guess the only way to find out is to try . Any experience ?
Even a 1:14 twist should handle any 55 grain bullet with no problems. The 1:14 twist theoretically is supposed to handle up to 60 grain bullets, at the high end of Swift velocities it may even handle bullets up to 65 grains. Over the years I've had four (4) .220 Swifts, but I never shot anything heavier than 55 grain bullets.
I have a Ruger 77 in 220 Swift. The guy I got it from gave me two box's of HSM Police ammo. Its a 64 grain soft point. My rifle is 14 twist and it shoot the 64 grain ammo very well.
I have one in a 700V 14tw. The 55’s gave me about inch, inch and a half groups. I tried the 40’s and got quarter inch group at 200. Although I agree any further would not have produced that with any wind at all. It was bedded, lugs lapped, and trigger job.
Well my 1885 shot the Sierra 55 SPBT poorly ,Shot the Nosler 55gr BT great but shot the Speer 55gr TNT excellent .
Have a 40x 22-250, 14 twist. Shoots knots with Hornady and Nosler 55 grain tipped bullets. Sierra 55 tipped shot almost 2 inches! After thinking barrel was going south and a "good" cleaning, I ran some non-Sierra 55 tipped back through it. Knotholes. Sierra's still 2 inches. Called Sierra, they advised what I was seeing was not unusual. It's not exactly weight, but length also figures in. But it also shot 60 V-max in the 1's. But it is a flatbase.
It is not the bullet's causing inaccuracies, its the loads. With one bullet - × grains of × powder is great but same powder load with y bullet is crap accuracy but y bullet with a different powder can do even better than the x bullet with x powder. It's not the bullet it's the powder. 14twist will perfectly stabilize all 55 grain bullet's.
