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Ruger m77 338 win mag

 
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  #1  
Old 02-22-2011, 11:43 AM
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Ruger m77 338 win mag

I have started reloading hornady 225g SST bullets. I checked for overall case length, and the bullets fit the chamber and shoot great but, the bullets do not fit in the mag well. They are too long. Basically, if i choose to stick with these bullets, my rifle will be a single shot.
Has anybody seen this before? If so, is there a way to fix it? These are the first loads I have worked up and I am afraid that no matter which bullets I choose, they will be to long.
Thanks for the help.
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  #2  
Old 02-22-2011, 12:54 PM
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Location: Allen, TX
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Re: Ruger m77 338 win mag

I don't know about mag well conversions to inclrease COAL for your rifle. There are some conversions for Rem 700's and Win M70. e.g. Wyatt's Outdoor Custom Rifles - Magazine Boxes

I've seen where Jim See (Coyboy in these forums) at installs them.

As for seating depth, I have seen a few situations where a bullet may shoot well at different seating depths. I'm not familiar with your bullets. But, Berger published a paper relative to theirs and I've had similar discussions with Swift about Scirroccos. (The latter was of no help because my twist was too slow.)

If you don't want to change bullets, you may want to try shooting some groups at .040", .080" and .120" jump to see if you can find another accuracy node. Then, you could fine tune the seating depth and powder charge iteratively by changing only one thing at a time.

-- richard
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Old 02-22-2011, 12:57 PM
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Re: Ruger m77 338 win mag

This may or may not work for you...
Berger Tips for Loading VLD Bullets Daily Bulletin
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  #4  
Old 02-22-2011, 12:57 PM
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Re: Ruger m77 338 win mag

Ruger 77 LA rifles tend to have fairly short magazines. They have just enough room to seat your bullets to about 3.340" which is the SAAMI spec for 30-06 length cartridges such as your .338WM. Your best bet would be to seat your SST's to this length and see how they shoot. If they don't meet your expectations, you can either experiment with seating them more deeply or try another bullet. Since the SST has a tangent ogive, it should not be as sensitive to seating depth.

There are also some pretty experienced LR shooters on this forum who advocate shooting hot loads with 185gr Barnes TTSX bullets in .338WM. Use of these bullets could be another avenue to explore by way of solving your COAL problem.
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  #5  
Old 02-22-2011, 07:49 PM
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Re: Ruger m77 338 win mag

I too have a Ruger M77 MKII in .338WM.

Below is a factory Hornady .225gr SST.



Below is my hand load - .225gr NAB



I had the COAL longer but it intermittently hangs up, <3.40" seems to be the max without any problem. I stopped at 73.5gr H4831SC and CCI250 and it's grouping <1/2 MOA @ 100 yards.

Good luck!

Ed
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  #6  
Old 02-22-2011, 08:51 PM
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Re: Ruger m77 338 win mag

Thank you all! For my rifle, coal is at 3.487. I have set them back to 3.473 seating depth. It seems to me that if I set it back to 3.340 or shorter, that is a heck of a jump, isn't it?
Again thank you all For your help. I will do some testing when it warms up and let you know how it works out.
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  #7  
Old 02-22-2011, 09:35 PM
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Re: Ruger m77 338 win mag

Quote:
Originally Posted by raven1776 View Post
Thank you all! For my rifle, coal is at 3.487. I have set them back to 3.473 seating depth. It seems to me that if I set it back to 3.340 or shorter, that is a heck of a jump, isn't it?
Again thank you all For your help. I will do some testing when it warms up and let you know how it works out.
I started my COAL similar to yours but had to take down to 3.40" until it cycles/feed properly.
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