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9/17/2020 5:59:48 PM
Posted: 12/18/2009 5:48:32 AM EDT
Most of my shooting is done with 55 to 62 grain bullets, so a 1:9 seems to work for me.   How heavy before I need a 1:7?
Link Posted: 12/18/2009 5:54:54 AM EDT
The general rule is that you should be fine up to the 69gr stuff. Some people say their 9 twist barrels can shoot the heavier (like 75gr) stuff fine, and some can't. The only way to know for sure is to get out and try it with your rifle.
Link Posted: 12/18/2009 5:55:34 AM EDT
Originally Posted By Market_Garden:
The general rule is that you should be fine up to the 69gr stuff. Some people say their 9 twist barrels can shoot the heavier (like 75gr) stuff fine, and some can't. The only way to know for sure is to get out and try it with your rifle.


/thread.
Link Posted: 12/18/2009 6:13:42 AM EDT
No one can answer this but you and your rifle. Some say 69 some say 75. My Stag would shoot 75 all day without a key hole but yours may not. Just buy a few boxes of ammo and try it out to see what it likes.
Link Posted: 12/18/2009 10:28:36 AM EDT
Depends as stated before. My 6724 Colt was a no go on 75gr. It would keyhole them. It did very well with 68gr on down.
Link Posted: 12/18/2009 10:39:48 AM EDT
My 1/9 Bushy will shoot 75gr without a problem. My 1/9 RRA........not so much. Just try it. maybe it works, maybe it wont.
Link Posted: 12/18/2009 11:09:05 AM EDT
About 69 grs.
Link Posted: 12/18/2009 11:59:28 AM EDT
45-69 for most.
Link Posted: 12/18/2009 2:38:55 PM EDT
I have some Hornady #22793 75 GR BTHP MOLY Match bullets that I plan on shooting from the 600 yard line slowfire prone.  They are specifically labeled TWIST RATE 1-9".

I'm also going to work up some loads for some Sierra Matchking's, 69 GR. HPBT-MATCH, Sierra # 1380, that are labeled 7" - 10" TWIST BBLS ONLY.  Gonna try these at 200 and 300 yards.

If you reload, it opens up a lot of possibilities.

BTW, the deal about what weight bullet shoots from what twist barrel is really more that just about weight, it's about the whole cross-section of the bullet - it's length compared to it's diameter.  It is an estimation as to how fast you need to spin the bullet to stabilize it vs having it blow up in flight.



Link Posted: 12/18/2009 3:10:49 PM EDT
Originally Posted By tpelle:
I have some Hornady #22793 75 GR BTHP MOLY Match bullets that I plan on shooting from the 600 yard line slowfire prone.  They are specifically labeled TWIST RATE 1-9".

I'm also going to work up some loads for some Sierra Matchking's, 69 GR. HPBT-MATCH, Sierra # 1380, that are labeled 7" - 10" TWIST BBLS ONLY.  Gonna try these at 200 and 300 yards.

If you reload, it opens up a lot of possibilities.

BTW, the deal about what weight bullet shoots from what twist barrel is really more that just about weight, it's about the whole cross-section of the bullet - it's length compared to it's diameter.  It is an estimation as to how fast you need to spin the bullet to stabilize it vs having it blow up in flight.

IIRC, that's the case with the tracer rounds used by the military- it's their length.
Link Posted: 12/18/2009 3:35:51 PM EDT
Thanks for all the input so far.    I'll keep it to 69 grain and under for now, but I'll eventually try some others to see how they do
Link Posted: 12/18/2009 4:18:59 PM EDT
I shoot the 62 and 69 BH in my SPR 20" 1-9..

Have not been able to make the 69 tumble but agree with Molon and trust his data. Anything 69 and over I would go with 1-7..
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