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Joined: Dec 2006
Posts: 148
Campfire Member
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Campfire Member
Joined: Dec 2006
Posts: 148 |
If I was going to build an AI for this caliber, I would do a 6mm Rem AI. Might as well get a meaningful increase.
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Chopaka
Snohomish Co, WA
NRA Life Member
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Joined: Jan 2005
Posts: 11,322
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2005
Posts: 11,322 |
If I was going to build an AI for this caliber, I would do a 6mm Rem AI. Might as well get a meaningful increase. If you are going to do that, why not a 6x284?
I may not be smart but I can lift heavy objects
I have a shotgun so I have no need for a 30-06.....
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Joined: Dec 2005
Posts: 1,228
Campfire Regular
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Campfire Regular
Joined: Dec 2005
Posts: 1,228 |
Have shot 6-284 a lot. Probably does not outperform a 243 ai by much although with a lot more recoil noise and powder. Action length might depend on bullet and seating depth. Brass must be formed in a two step process from 284 winchester or one step with 6.5x284.
"We are building a dictatorship of relativism which recoqnizes nothing as definitive and whose ultimate goal consists solely of ones own self ego and desires."Cardinal Rathzinger
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Joined: Oct 2008
Posts: 7,263
Campfire Tracker
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Campfire Tracker
Joined: Oct 2008
Posts: 7,263 |
Back to the original question. If the rifle is priced well I would get it. Have a look with a bore scope first. If dies come with it then better still. If you want to shoot 243 for awhile you will loose only around 40-50 fps in most cases.
Target shooters especially with hot or double based powders like R17 or VV 560 and running heavy VLDs at maximum velocity will loose target grade accuracy in as few as 1,000 - 2,000 rounds. Hunting accuracy could almost triple that.
Only if you did a lot of varmint hunting or target shooting would you burn out the barrel in short order.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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Joined: Oct 2015
Posts: 443
Campfire Member
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OP
Campfire Member
Joined: Oct 2015
Posts: 443 |
So updating here.....original pick up was a Sako L579 forester 243ai
Sold the older aftermarket stock that was included and replaced it with a Boyd’s custom shop hardwood stock cut for this action.
Barrel was pretty used up...replacing with a fluted .284 Douglas barrel in 7mm08.
Dropping in a Timney......at cerokote now and should have in a few weeks
She will wear a Swaro 3-12x50 and kill a lot of things.
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Joined: Mar 2005
Posts: 26,226
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 26,226 |
You'll gain right at a 5% increase in powder capacity which translates to perhaps a 1.5% increase in velocity at same pressures. Assuming 3000 fps for the parent case that gives 45 fps more, hardly worth writing home about. Rate of throat erosion will be reduced by around 10% which is good considering the .243 eats throats. You will also rarely if ever trim cases. I trimmed a batch of cases right after fire forming and over 25 firings they never needed trimming again. When I finally tossed them at 25x they had only gained around .005-.006" in length.
Getting back to the velocity increase. Lots of AI shooters claim greatly increased velocities because they load to higher pressures. In the .243 I think that might be somewhat valid. The .243 shows a wider variation in pressures in a given string so it's max pressure was lowered some time ago. The 40 degree shoulder of the AI tames that bad habit so one could load back up to the original pressures. Doing that combined with the velocity increase provided by increased case capacity could net you maybe 75-100 fps more. That's just theoretical discussion which I wouldn't personally condone unless you know the pressure specs of the original loading, have very good pressure testing equipment and know how to use it.
But the increased throat life and lack of trimming are the main benefits for the .243 AI.
. All of this^^^ The throat of my 243 AI with a SS barrel is eroding a LOT slower than other 243's I have. That's why I chose to AI a new factory SS 243 bbl, rather than expecting any significant increase in velocity. If I had to do it again I would give the 6mm Creed a hard look.
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.
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