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Rifles, Bullets, Barrels & Ballistics Applied Ballistics



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Unread 02-07-2007, 12:09 PM
Bronze Member
Join Date: Aug 2005
Posts: 44

I'm working on getting parts together for my first custom rig and need some help. I'm going with 300 RUM and trying the 200 accubond and matchking, and possibly the 220 MK. What twist should I go with for this weight range? I know a faster twist is needed for the heavier bullets to stabalize them, and that too fast at twist at higher velocities will cause lighter bullets to spin apart? Is this a concern in bigger bore calibers?

What about groove selection?

Again, I'm just getting into this long range stuff and custom builds, so I'm spongin up any knowledge you can give me. Its takin' me some time getting things together and putting dollars together (I'm a school teacher) but I want to build my first one right. I've got several things together, mainly just reloading stuff for the RUM that I didn't have already, jewell trigger, badger base and rings, rem action, so I'm getting closer! Looking at a barrel blank next to send to the gunsmith when I get it all together.
Thanks again for your help!
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Unread 02-07-2007, 05:24 PM
Join Date: Dec 2004
Location: El Reno, OK
Posts: 1,922
Re: Twist??

A 1-10" twist will serve you just fine. The groove choice is up to you. As long as you go w/a top bbl maker, you won't be dissapointed.
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Unread 02-07-2007, 05:49 PM
Silver Member
Join Date: May 2006
Location: north dakota
Posts: 100
Re: Twist??

It is hard to beat a 1-10 twist in 30 cal.
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Unread 02-07-2007, 06:25 PM
Platinum Member
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 4,225
Re: Twist??


[/ QUOTE ] [-1sp]
It's 'stabilize'
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Unread 02-07-2007, 06:40 PM
Platinum Member
Join Date: Jun 2001
Location: Potomac River
Posts: 5,088
Re: Twist??

Yes'm, I'll try to do better.
The Smokin Fur Rifle Club
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Unread 02-07-2007, 08:15 PM
Platinum Member
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,830
Re: Twist??

A 10x will work with the 200 AB and 220 SMK well. If you want a slightly slower twist for better use with a variety of 180's, the 11x will work well also for the 220 SMK and 200 AB. You will NOT stabilize the 240 SMK with the 11x though.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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