Rechamber
Can a T/C encore 25-06 be rechambered to Ack. Improved 40 degree? Are we going to run into problems by needing to shorten the chamber to clean up the orig. chamber. That will affect the breeck dimensions since the pivot pin is welded. THX in advance
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No...you will run into problems, as you described.
EDIT 1
quote:On the other hand, Ackley thought the .25-06 was already "overbore" and not much to be gained by Improving it. Are present powders enough better to make use of the increased volume?
Increased case capacity is just one of the attributes of an Ackley Improved case.
The 40 Degree shoulder is the best one. It creates less recoil, and improves case life, by impeding the flow of brass.
If you are so inclined to have an Ackley, you should just go to Bull Berry, or MGM, and buy one. It will save a lot of time and headache, and most likely money, unless you have the stuff to cut the mounting lug off the barrel, cut the barrel down on the breech face, rechamber it, then machine the extractor groove in, and weld the mounting lug back on. Oh yes...you will have to re machine, or drill and tap the holes for mounting the forearm, too.
EDIT 2
quote:"creates less recoil"
When the shoulder is more square to the axis of the bore, it creads more surface area facing the reward direction, for the gas to thrust off from. Very much like how a good muzzle break works, by redirecting the gas at a reward direction. Physics and Trigonometry combined.0 -
Hawkshaw,
Every Ackley re-chamber requires that the original chamber be set back in order to create the proper shoulder for headspace. Since T/C Contenders and Encores have a fixed breech relationship there is no way to safely cut a proper re-chamber.
Best.0 -
Or, you re-chamber it to your own wildcat and not use factory 25-06 ammunition at all. Here's your chance to name your very own cartridge after yourself, or any other name you might want. 0 -
OR....chamber to .25 Gibbs 0 -
DO NOT mess with that breech [xx(][:0]
Rechamber like Mike says, or get another barrel close to 25-06 ACK that is close to the velocity you want.
Check some here, www.eabco.com0 -
I understand the procedure to get a REAL Ackley Improved chamber which calls for setting the barrel back enough to let factory loads headspace properly for fireforming. Straightforward with a bolt action.
But would it not be possible to run the AI reamer into the TC chamber enough to clean it up and then treat it like a wildcat calling for special forming instead of just shooting factory loads?
That would let you use common reamer and dies.
On the other hand, Ackley thought the .25-06 was already "overbore" and not much to be gained by Improving it. Are present powders enough better to make use of the increased volume?0 -
quote:Originally posted by Hawk Carse
I understand the procedure to get a REAL Ackley Improved chamber which calls for setting the barrel back enough to let factory loads headspace properly for fireforming. Straightforward with a bolt action.
But would it not be possible to run the AI reamer into the TC chamber enough to clean it up and then treat it like a wildcat calling for special forming instead of just shooting factory loads?
That would let you use common reamer and dies.
On the other hand, Ackley thought the .25-06 was already "overbore" and not much to be gained by Improving it. Are present powders enough better to make use of the increased volume?
Rechamber to cleanup, fit brass to the chamber and call it a wildcat. Personally, I think you are chasing a problem that don't exist. Why send a .257 bullet faster? I mean why, practically?0 -
+1 for why? Are you looking for shorter barrel life? Have lots of powder that is slower than say 5010? I once had a 30 Gibbs, it shot really well but I'm not all that fond of short necks.
The last 25-06 I was around was a NEI. It was shooting sub half NOA right out of the box with factory high dollar ammo (Winchester Supreme IIRC).0 -
quote:Originally posted by tsr1965
No...you will run into problems, as you described.
EDIT 1
quote:On the other hand, Ackley thought the .25-06 was already "overbore" and not much to be gained by Improving it. Are present powders enough better to make use of the increased volume?
Increased case capacity is just one of the attributes of an Ackley Improved case.
The 40 Degree shoulder is the best one. It creates less recoil, and improves case life, by impeding the flow of brass.
I understand the claim for increased case life with less taper and steeper shoulder. You are going to have to explain how it "creates less recoil" when the loads are heavier.0 -
Hawkshaw,
quote:On the other hand, Ackley thought the .25-06 was already "overbore" and not much to be gained by Improving it. Are present powders enough better to make use of the increased volume?
Given the difference in decades since Ackley wrote about his opinions and tests, the world of reloading has undergone some serious revitalization with new powder technology, more new powders and an increase in the number of higher quality bullets to shoot. These alone are enough to re-evaluate his comments with regard to 'overbore'.
New powders and new powder technology have improved the ability of former high capacity cases to perform in the realm of good efficiency with higher velocities. The 'improved' shoulder, no matter what degree is assigned, 30, 32, 35 or 40 degrees, has been demonstrated to enhance the ability of the powder to burn more efficiently. These angles also figure into the lessening of throat wear from the impinging plasma, especially when combined with longer necks.
I have both the .25-06 Rem. in rifles as well as a couple of variations of the improved versions. Both types perform admirably with the proper selection of powders and bullets. In fact, I have a rifle with an improved chamber which is very accurate with a complete range of bullets from 75 grain VMAX up through 120 grain Nosler Partitions and 115 grain Cutting Edge Match bullets. Bear in mind that it is the design of the throat and leade which allows for this, not just the chamber body itself.
Best.0
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