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Posted: 10/13/2004 4:36:35 PM EDT
[#1]
Generally, they are 1/12 and I'm not sure if the 62gr bullets will work or not. Likely that they will, but I have no experience with this.
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Posted: 10/13/2004 4:40:02 PM EDT
[#2]
I know the older ones are 1/12 My SP1 is a '64 and it's a 1/12 I don't know when they might have changed to 1/7 but yours might be if it's from the 80's Look under the barrel at the muzzle end and see if it has any markings. If it is a 1/12 I'd stick with the 55 Grn. I tried the 62 Grn stuff and it was all over the place.
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Posted: 10/13/2004 4:45:36 PM EDT
[#3]
1/12.
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Posted: 10/13/2004 4:46:21 PM EDT
[#4]
I think if it's an sp1 all original with a pencil barrel it should be 1/12. When the sporters came on the scene with the gov't profile a2 barrels in when colt had switched to 1/7. The 16" pencil barrels must have come out around this time as well...but not sp1...I think
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Posted: 10/13/2004 5:09:22 PM EDT
[#5]
55gr is fine, there is nothgin 62 gr does better, except M855 and armor penetration.
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Posted: 10/13/2004 7:18:01 PM EDT
[#7]
Yeah, 62 gr. will keyhole after 90 yards. read ammo-oracle.com.
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