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Free floating m70 stock.

 
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  #1  
Old 02-24-2013, 09:00 PM
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Join Date: Feb 2013
Location: Idaho Falls, Idaho
Posts: 57
Free floating m70 stock.

Hello everyone, I'm just getting into longer range shooting and some minor gun smithing. So this is my question for everyone, I shoot a Winchester model 70 300 win mag. I'm needed to float the barrel so i took it apart and sanded it down to where it will pass a dollar bill underneath it. The problem that I have run in to is that with the synthetic stock when I use my bipod or sandbag the stock bends up into the barrel. Has anyone hit this problem and found a good way to fix it. I would like to keep the stock i have because I am on a budget. If anyone has some advise it would be great to hear. Thanks!
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  #2  
Old 02-24-2013, 09:20 PM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Free floating m70 stock.

Has this rifle been bedded yet? If not try this kill 2 birds with 1 stone
Stress-Free Pillar Bedding within AccurateShooter.com
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #3  
Old 03-01-2013, 07:17 PM
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Join Date: Jul 2010
Location: SC
Posts: 144
Re: Free floating m70 stock.

Running into same problem with an MPI stock blank that I'm building up for a Mod 70 (coincidence, not a M70 issue). AFTER I made sure that I had relieved enough to re-float the barrel by hogging out the forearm, this is what I did:

I got some small aluminum "H" channel - cut a "trench" with a dremel in the bottom of the forearm all the way from the recoil lug trench forward to within and inch of the for end . Made it really rough and jagged, just made sure that the aluminum would be below the 'flush' line. Mixed up fiberglass resin, with some added chopped fiberglass filler to thicken slightly, and poured it in - once it was set up (fiberglass is very hard and stiff), I carefully applied 5 layers of 10mil tape to the barrel and finished glass-bedding the forearm. When that was set up, removed the action, peeled the tape off and now my forearm was rigid and free-floated.

Note: if you still have a few touch points, buy some 3/4, 7/8, and 1 inch dowel - staple some 60 grit sandpaper to pieces of dowel and use to sand down the high points - if in doubt use 6 or 7 layers of tape.

Good luck

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  #4  
Old 03-01-2013, 08:12 PM
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Join Date: Jan 2008
Posts: 1,105
Re: Free floating m70 stock.

pmh-usa has good advise. I used aluminum arrow shafts, because I had some bent/broken ones kickin around, instead of the H channel. I thin kthat the h channel probably would work better.

If you have an INJECTION MOULDED stock, thats the cheap sythetic that comes on most factory guns (m70 shadow), you will want alot more than the dollar bill worth of free float. i have several injection moulded stocks and they all shoot well, but I have removed enough to have a 3/16" gap on both sides. It aint pretty but it is the only way to garantee a free float when you hit extrem temp changes.

I actually got to see the drastic change when I had uniformly done 3/16" either side with my remmy, and when it got to about 35*celcius it was almost touching.
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  #5  
Old 03-01-2013, 08:33 PM
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Join Date: Jul 2010
Location: SC
Posts: 144
Re: Free floating m70 stock.

Amazing differences among acraglass, pro-bed, marine-tex (white and gray), and devcon derivatives - the one thing that I found that will migrate the least during extreme swings in temp, is plain old fiberglass resin - curies quickly (make sure that you double the hardener with temps below 76F) and cures damn hard! You can add fillers or use with fiberglass cloth but if you fill all voids thoroughly you'll be assured that nothing will give and nothing will move .
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  #6  
Old 03-01-2013, 09:26 PM
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Join Date: Feb 2011
Location: Halfway between Lubbock and Dallas
Posts: 5,028
Re: Free floating m70 stock.

Quote:
Originally Posted by theEMP View Post
Hello everyone, I'm just getting into longer range shooting and some minor gun smithing. So this is my question for everyone, I shoot a Winchester model 70 300 win mag. I'm needed to float the barrel so i took it apart and sanded it down to where it will pass a dollar bill underneath it. The problem that I have run in to is that with the synthetic stock when I use my bipod or sandbag the stock bends up into the barrel. Has anyone hit this problem and found a good way to fix it. I would like to keep the stock i have because I am on a budget. If anyone has some advise it would be great to hear. Thanks!
Is this a plastic factory stock or a fiberglass/resin synthetic?
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  #7  
Old 03-01-2013, 09:40 PM
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Join Date: Jan 2008
Posts: 1,105
Re: Free floating m70 stock.

"Amazing differences among acraglass, pro-bed, marine-tex (white and gray), and devcon derivatives"

Sooo true. I used marine tex for my first two, then switched to fiberglass (short and long hair, not mat and cloth), and the fiberglass is much stiffer.
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