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Author Topic: Is it possible to rechamber a .17 HRM to .17 Ackley Hornet?  (Read 625 times)

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Offline patrick_sween

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Is it possible to rechamber a .17 HRM to .17 Ackley Hornet?
« on: March 05, 2004, 04:00:45 PM »
Now that the HRM barrels seem to be readily available, I was wondering if the bore dimensions are the same as for the .17 centerfires.  It seems that starting with a factory 23" bull barrel and re-chambering to .17 Ackley Hornet might be a cheap way to get a .17 centerfire as compared to going full custom.  

I've never tried a .17 and would like to, but with a tight budget, and the cost of necessary form dies, I'd be over my limit to also buy a full custom barrel.  I can trade a .223 carbine barrel towards a factory 23" HRM and probably come in around $250-300 for the whole project, including dies and re-chambering.  Is this a bad idea?  Is the quality of the factory HRM barrel good enough to bother?  Seems like everyone loves the HRM, but I enjoy reloading and it looks like I can probably put together .17 reloads for similar cost to HRM ammo and gain some performance to boot.  Thanks for any advice on this one.

Patrick
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Offline jrcanoe

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Is it possible to rechamber a .17 HRM to .1
« Reply #1 on: March 05, 2004, 05:33:40 PM »
I not shure about the twist rates, but I did see a guy advertiseing this for the H@R handy rifles. I would like a mach IV but will probably just keep looking for a 17 rem.
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Offline Jetflyer

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Is it possible to rechamber a .17 HRM to .1
« Reply #2 on: March 09, 2004, 12:36:01 PM »
Well the twist in the 17 Ackley Hornet is 1in 10, still trying to find out what the 17 HMR is, I would also be interested in this
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Offline BruceP

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Is it possible to rechamber a .17 HRM to .1
« Reply #3 on: March 10, 2004, 06:03:28 AM »
I have also thought of this for the contender. It will be interesting to see what you find out. I don't see how this conversion would work on a handi-rifle though since you will have to change from rimfire to centerfire.
BruceP
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Offline patrick_sween

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Thanks. Who has an HMR factory barrel? What's the twist?
« Reply #4 on: March 10, 2004, 03:57:50 PM »
I've been hearing mixed signals on the factory .17 caliber barrels.  Some say they are junk, others think they are great.  I'm not looking for BR quality, just sub MOA consistently.  I'd consider rechambering to either the .17 Ackley Hornet or the .17 HeBee (I'm leaning to HeBee right now)  The cost to get set up with either would be about the same, and the HeBee will get a 20 gn. up to about 3950.  I've been running the numbers, and drop and wind drift should about match a 55 gn. 22-250 out to 300+ yds. using a third of the powder.  So, who's got a 17 HMR barrel who can comment on the accuracy they're seeing and the twist rate they have?

Thanks again.

Patrick
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Offline DannoBoone

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Is it possible to rechamber a .17 HRM to .1
« Reply #5 on: March 11, 2004, 05:27:27 PM »
My Marlin 17vs got 1/4 & 3/8" groups @ 75yds right after I got it. That was
good enough for me and I just went huntin' with her after that. She has
popped a couple squirrel heads at around a hundred yards, so I am well
pleased with its accuracy. Got a question in about barrel twist rate over
at rimfirecentral. My guess is 1-12, but that's purely a wild guess 'til I
get an informed answer.
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Offline Jetflyer

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Is it possible to rechamber a .17 HRM to .1
« Reply #6 on: March 13, 2004, 05:16:30 PM »
Well should work out well! The T/C 17HMR is, 1- 10 twist This is on varmint Al's web site, In one of his caparison charts, Same as the 17 ackley hornet. Now all I need is someone to chamber this barrel  Anyone??
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Offline Jetflyer

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Is it possible to rechamber a .17 HRM to .1
« Reply #7 on: March 13, 2004, 05:25:51 PM »
Varmints Al's                                                                                        Rifle Twist  Bullet Bullet Velocity  Spin Powder Recoil  Bullet  Energy Caliber
  Wt          Dia    Mass                  Mass  Energy  Linear   Spin
 (lb)(T/in)   (in)   (Gr)   (fps)    (rpm) (Gr)  (ft-lb) (ft-lb) (ft-lb)
 --------------------------------------------------------------------------------
  6.0 10.0   0.172    17     2550   183600   5.5   0.25    245     0.36  17 HMR
  6.0 14.0   0.224    40     2800   144000  12.0   1.50    696     0.88  22-Hornet
  6.0 12.0   0.224    50     3300   198000  26.0   4.36   1209     2.08  223 Rem
  6.0 10.0   0.243    55     3600   259200  44.0   8.67   1583     4.61  243 Win
  8.0 10.0   0.172    17     2550   183600   5.5   0.19    245     0.36  17 HMR
  8.0 14.0   0.224    40     2800   144000  12.0   1.12    696     0.88  22-Hornet
  8.0 12.0   0.224    50     3300   198000  26.0   3.27   1209     2.08  223 Rem
  8.0 10.0   0.243    55     3600   259200  44.0   6.50   1583     4.61  243 Win
 10.0 10.0   0.172    17     2550   183600   5.5   0.15    245     0.36  17 HMR
 10.0 14.0   0.224    40     2800   144000  12.0   0.90    696     0.88  22-Hornet
 10.0 12.0   0.224    50     3300   198000  26.0   2.62   1209     2.08  223 Rem
 10.0 10.0   0.243    55     3600   259200  44.0   5.20   1583     4.61  243 Win
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