I’ve seen where people say you have to use 62gr bullets or larger for this Twist on a barrel. Is this so? Whats advantage of the 1:7 over the 1:9 ect? Thinking on ordering the Palemtto when they become avalable again. Thanks!
Search button is your friend.
Here is one posted just yesterday:
55gr works just fine in a 1:7 twist. Probably no less though.
Not necessarily.
Cool thanks guys I was just curious. I didnt figure it would make that much difference.
Your standard 55gr rounds will shoot fine. The 1 in 7 will allow you to stabilize bullets, from what I understand up to around 77gr.
1/8 is all that is required for 77gr. From an accuracy standpoint I dont think you can over spin the bullet, at least as far as using what is generally available today. Im not sure what it does to its terminal performance though. 1/7 was necessitated by the use of the really long M856 tracer. However it will shoot any of the commonly avialable range/target/duty loads (55-77gr) and shoot them well. I have no experience with the lighter bullets of the varmint territory.
+1
yep the tighter twist is used to for LONGER tracer rounds. The weight of the bullet was not the main concern. My guns all have 1:7 and I like the options, but not needed.
There are so many threads on this I literally can’t just point to one and say “go”, nor do I really feel like rereading all of them to give you the “best one”.
Here’s what it boils down to:
1/7 will do just fine with bullets down in the varminter weight up through the heavyweights that meet magazine restrictions. The same can be said for 1/8, but they are not nearly in the same abundance on the market and tend to be found in precision-oriented stainless steel barrels.
The big cry about barrel twist is 1/9, as they are spotty at best with weights over 69 gr. Some will stabilize 77 gr length bullets, others will fail to stabilize 75 grainers, and temperature will induce another variable to stability. If you are using a suppressor and a 1/9 barrel, it is generally recommended that you stay with 69 gr or less.
Also remember that stabilization isn’t really about the weight of the projectile (grains), but rather of the length of the projectile. Since most bullets are constructed of the same materials, the weight is a decent indicator of relative length, but that is not always so, proof in the M856 tracer, which is longer but only slightly heavier than the 62gr M855, which is also slightly longer than conventionally built 62gr projectiles due to the less dense steel insert.
Long story short, get a 1/7 or 1/8 and don’t worry about it.