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  #16  
Old 03-04-2019, 08:09 PM
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You are also correct that the 15.5gr bullet is longer than the 17gr.

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  #17  
Old 03-05-2019, 07:01 PM
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I wonder if that’s why Savage changed to 1:14 twist in their Mark ii 17 Mach 2.
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  #18  
Old 03-05-2019, 08:43 PM
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Originally Posted by jayman07770 View Post
I wonder if thatís why Savage changed to 1:14 twist in their Mark ii 17 Mach 2.
I didn't know that they did that, seems unlikely that it will stabilize the 15.5gr.

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  #19  
Old 03-05-2019, 09:38 PM
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I’m also looking for a good 17 Mach 2 barrel combo that shoots the NTX since our state has gone lead free.
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  #20  
Old 03-06-2019, 08:58 AM
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Originally Posted by jayman07770 View Post
Iím also looking for a good 17 Mach 2 barrel combo that shoots the NTX since our state has gone lead free.
Keep us posted on what you find out, I will do more testing with mine, but I am pretty sure it will never work in this rifle unless something is wrong with the lot of ammo I have.

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  #21  
Old 03-07-2019, 06:35 PM
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Okay, I went and shot the Martini some more at 50,and 100yrds. I had no keyholes, and pretty good accuracy. I was using a very old box of Hornady. 17Mach2. Had several case splits, one of them from stem to stern, see picture. Wasn't able to shoot 150 or 200yrds today, but I will try that soon. Before someone asks about the chamber, yes it is good.

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  #22  
Old 03-07-2019, 07:12 PM
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Originally Posted by jayman07770 View Post
I wonder if thatís why Savage changed to 1:14 twist in their Mark ii 17 Mach 2.
That's an error on the website that's replicated all over the place, unfortunately.

The Savage 17hm2 is a 1:9 twist.
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  #23  
Old 03-08-2019, 09:50 AM
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Are you experience any case splitting with the new Hornady or CCI ammo. I have heard from different sources that the old ammo had that issue but Hornady never admitted to it.
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  #24  
Old 03-08-2019, 11:14 AM
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Checking for rifling engraving

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Originally Posted by STRUGL4X'SC View Post
I think you might be onto something, but it is the other way around. I removed and measured both bullets, and the ones that keyhole are two thousandths bigger!

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You might need to try driving an unfired bullet of each side thru the bore to see how deep the rifling is engraving the bullets. Another thing to check would be the distance that the bullet has to jump before encountering the rifling. The case splitting could be due to the chamber being a bit too long! And, lastly, is your rifle chambered with a forcing cone at the end of the rifling? Just some things to consider!
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  #25  
Old 03-08-2019, 02:32 PM
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I'd get a new box of 17HM2 and test.

Based on my experience Hornady had a seriously bad run of HM2 ammo at one point. I had some that blew up and broke the bolt handle on my 10/22 HM2 conversion that had previously been text book reliable for two years of varmint. Rifle and chamber were very clean.

I believe the Hornady lot# that caused the problems is K29K02.



Sadly I was forced to retire my favorite Sage Rat rifle, it was a laser with the ER Shaw barrel.

I've been impatiently waiting for a higher grade HM2 bolt gun with threaded barrel going on 5 years now.
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  #26  
Old 03-08-2019, 09:51 PM
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It has been discussed before, but older 17HM2/17HMR ammo can crack over time, while sitting in the box. I suggest you inspect the necks of any old 17 rimfire before you shoot them.

I hope you get things worked out with your rifle!
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  #27  
Old 03-18-2019, 09:37 AM
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Okay, for anyone interested, I shot the rifle again, same results. Cleaned the bore well after having good results with 17gr Vmax. Set up a two bull target at 50yrds, shot 5rnds of NTX on the left, then 5rnds of CCI .17hm2 Vmax on the right.

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  #28  
Old 03-19-2019, 07:14 AM
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Quote:
Originally Posted by m17hm2 View Post
That's an error on the website that's replicated all over the place, unfortunately.

The Savage 17hm2 is a 1:9 twist.
Quote:
Originally Posted by Eric Mayer View Post
It has been discussed before, but older 17HM2/17HMR ammo can crack over time, while sitting in the box. I suggest you inspect the necks of any old 17 rimfire before you shoot them.

I hope you get things worked out with your rifle!
This covers a good part of the problems you're having, good luck.
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  #29  
Old 03-19-2019, 08:47 AM
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Was the NTX ammo old or manufactured recently.
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  #30  
Old 03-19-2019, 10:02 AM
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No case splits at all this time, my twist is 1in 10". Not absolutely sure about the age of the ammo, but it was purchased recently from a high volume seller.

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