nemo
Six pointer
Posts: 55
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Post by nemo on Jun 1, 2008 19:03:10 GMT -5
Eh...nevermind the last post. They come that way, right?
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Post by thelefthand on Jun 1, 2008 19:36:18 GMT -5
indyml10 - If you took them to the point where a magnet would not stick to them, then they should be 60~62 Rc.
As far as the color chart goes, it looks pretty, but it's not always consistant. On one hand, the steel is actually generating the color of light that you are seeing, so you would think that it's accurate. On the other hand, ambient light still has an effect, so there are inconsistancies. The best bet is to use a magnet. It makes sure that you heat it enough, without going over board and damaging the screw.
Nemo - Yup, they come that way.
I forgot to mention in my earlier post, that if anyone wants to temper their screws, it needs to be done right after you quench them.
Just another 2 bits,
Mark
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Post by rrbou on Jun 15, 2008 18:58:31 GMT -5
OK guys here is the latest report on my hardened vent. After the first 230 shots I went back to the load that shoots under 1" for me at 100. That is 74 gr of 10x 300gr SW and short mmp. This load will keep the groups small until the vent gets to .037 then they get big fast. The first 60 shots stayed under 1" then grew to 2" for next 15 shots. Checked the vent and it was .038. The next 5 shot group was 5+ inches. Vent measured .040 after this group. Installed a new vent and group went to 1" again. Can't wait for some reports from others.
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indyml10
Eight Pointer
my buck
Posts: 182
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Post by indyml10 on Jun 16, 2008 22:18:04 GMT -5
well i did them heated till a magnet would not stick and quenched in mercon trans fluid now for the shooting woo-hooo
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Post by thelefthand on Jun 18, 2008 18:19:01 GMT -5
rrbou - Wow 300 shots is pretty darn good! Heck, in the 5ish years I've had my Savage, I've only put about 300 rounds through it. Looks like this is a good way to go.
Indyml10 - Look forward to hearing your results.
Mark
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Post by richard on Jun 18, 2008 21:11:21 GMT -5
So here is my latest report (still no gun ): Today I drilled and tapped a piece of steel for a 10-32 thread. I proceeded to screw in one of my cold water quenched ventliners to ascertain its resistance to breaking at the thread/shoulder juction. I tightened it up with a "Bondhus" brand American made quality Allen wrench (1/8" I believe) The wrench is 1" x 4". I put the 1" portion into the ventliner and tightened it until I got a pretty good bend in the wrench. I mean tight!!! I did not want to break my wrench so I backed off short of doing so.....or breaking the ventliner. In any event, I will have no worries about breaking of a tight ventliner. At the same time getting the advantage of many more shots with little variation in hole diameter. TO QUENCH OR NOT TO QUENCH, that is the question? Definitely cold water quench! Richard
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lc
Spike
Posts: 22
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Post by lc on Jun 19, 2008 11:19:27 GMT -5
One question what does the hole measure after heat treating? Usually heated steel shrinks after it cools and more so if it's cooled rapidly. You might be gaining a number of shot if the hole is smaller than .031. Not a bad thing probably a bonus.
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Post by richard on Jun 19, 2008 14:13:23 GMT -5
Ic: You are right! But not by much I found that when I tried to go back with my .031" drill that it was vvvverrrrrryyyyy tight and actually would make it want to slip in the chuck which marginally holds the bit. So, lets just say it becomes a very tight .031" hole. Thats pretty darn good in my book. Richard
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Post by rrbou on Jun 28, 2008 14:37:58 GMT -5
Here is another report on hardened vents> I ordered some screws from granger, drilled them then hardened them. First screw lasted 60 shots and was toast measuring .039 after 60. second screw lasted 120 shots and was at .038. This is disappointing compared to the savage screw. But it is still better than without hardening although only slightly. I think it still comes down to the fact that it is not controlled hardening. I think that I did not get them hot enough as my torch was not up to the task. The savage screws I did at work where I have access to as much heat as I want, (I work at a bridge fab plant and can liquefy them if I want to.) At home I am limited to a braze o matic. I am sure that I did not go to the austenitic zone on them but did not have a magnet to check. I am going to take some to work and try again. I also ordered 4 more savage screws from mid south. I will harden them also and the saga will continue. Richard I hope that you got your rifle back so that you can start testing also.
Also can some one convert 2560 Fps at 15 feet from the muzzle 300 gr BO to muzzle speed for me. Thanks Randy.
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Post by DW on Jun 28, 2008 14:54:13 GMT -5
Also can some one convert 2560 Fps at 15 feet from the muzzle 300 gr BO to muzzle speed for me. Thanks Randy. Using 2560 at the muzzle, the speed drops off 31fps at 10yds, so adding half that to the 2560 should increase your muzzle speed to approximately 2575. Unless I'm wrong.
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Post by Flatland Hunter on Sept 26, 2008 17:41:33 GMT -5
Just an update on what I am doing...
I have finally started shooting my vents. So far so good. I started with off center vents. As which Richard has noted there are some that are a diameter or less from center. No issues.
This is what I am going to do... shoot one plug dirty with carbon and the other cleaned after every time out... to see which is most consistently accurate and how long a vent will last. I am using I4198 and RL7 with 300 gn projectiles, some .452 some .458.
Anyway, I up to 16 shots on one vent with no discernible opening of the vent. I will be shooting more as it cools and I have the time.
I am so far satisfied with my vents...
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Post by DBinNY on Sept 26, 2008 19:16:43 GMT -5
Sounds great Robbie, keep us posted. It will be interesting to see if the vents last longer with the dirty plug.
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Post by Flatland Hunter on Sept 27, 2008 14:34:31 GMT -5
Well, things did not go quite as planned today... 12 shots (including the fowl shot), 68 and 65 gns. The 300 BO, BCR... 68gn would put 2 close, 1 away, 1 close, 1 away. Frustrating! Backed off to 65gn and started piling them in! 6 shots inside 1.25", twitched on the shot that opened it to 1.25", called it though. All of this on the dirty plug... makes 29 shots on the dirty. None on the clean. Maybe next outing.
I will check to see if the vent opened at all and post if it has.
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Post by thelefthand on Sept 27, 2008 15:06:16 GMT -5
I don't know about you guys, but I've noticed that the loads that I was getting MOA out of in the spring are now shooting all over the place. I'm thinking the 80 degree weather is the culprit for me. I'll be glad when summer is GONE!!! I can't wait for the first frost!!!!
Mark
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Post by CraigF on Sept 27, 2008 15:31:23 GMT -5
I don't know about you guys, but I've noticed that the loads that I was getting MOA out of in the spring are now shooting all over the place. I'm thinking the 80 degree weather is the culprit for me. I'll be glad when summer is GONE!!! I can't wait for the first frost!!!! Mark Mark DITTO!!!! The load I was shooting in April at the shoot is horrible now. I need below 65 for it to work.
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Post by Flatland Hunter on Sept 27, 2008 16:00:49 GMT -5
It was in the 50's here... like Rifleman says, it will be a whole other story when it gets below 50*.
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