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Discussion Starter · #1 ·
What is the listed rate of twist for the PS90s?

Also, what would be the best rate of twist replacement short-barrel if I fire mostly SS197 (with some SS91 and sub-sonic thrown in)?
 

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wikipedia lists the P90 as having a 1:9, which is what i purchased from cmmg for my sbr.

i also got the 1:7 they have for heavier rounds once my can comes in
 

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Discussion Starter · #3 ·
acmeraptor said:
wikipedia lists the P90 as having a 1:9, which is what i purchased from cmmg for my sbr.

i also got the 1:7 they have for heavier rounds once my can comes in
Shorter twist is better for heavier rounds? I'm trying to decide which to get for my SBR because I'll be firing sub-sonic ammo through it with my silencer, but probably 197 the rest of the time.
 

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FSCJedi said:
acmeraptor said:
wikipedia lists the P90 as having a 1:9, which is what i purchased from cmmg for my sbr.

i also got the 1:7 they have for heavier rounds once my can comes in
Shorter twist is better for heavier rounds? I'm trying to decide which to get for my SBR because I'll be firing sub-sonic ammo through it with my silencer, but probably 197 the rest of the time.
Yes, the faster twist is better for heavier boolits. The only drawback is a faster twist will result in less de-stabilization down range. If you are only shooting paper and not living targets, 1/7 probably wont be an issue.

Gregg
 

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Discussion Starter · #5 ·
gregg877 said:
FSCJedi said:
acmeraptor said:
wikipedia lists the P90 as having a 1:9, which is what i purchased from cmmg for my sbr.

i also got the 1:7 they have for heavier rounds once my can comes in
Shorter twist is better for heavier rounds? I'm trying to decide which to get for my SBR because I'll be firing sub-sonic ammo through it with my silencer, but probably 197 the rest of the time.
Yes, the faster twist is better for heavier boolits. The only drawback is a faster twist will result in less de-stabilization down range. If you are only shooting paper and not living targets, 1/7 probably wont be an issue.

Gregg
I plan on shooting some living targets, such as varmints, etc...
 

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Considering varmints etc. don't wear body armor or have as much mass as people, I'd say you'll probably be ok with the 1/7.

Gregg
 
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