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Reloading for the 300 win. Results Questions

 
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  #1  
Old 05-31-2010, 07:25 PM
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Location: So. Utah
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Reloading for the 300 win. Results Questions

So I set out today with my new trusty Ruger Hawkeye 300 Win Mag. I had worked up some test loads to find what my new rifle was going to shoot best. The bullets that I had chosen were 180 grain Sierra Gameking spire point boat tails. I like these bullets for their design and the fact that they are one of the few 180 grain bullets that breaks .500 for ballistic Coef. I loaded these bullets with IMR 4831 and CCI 250 Large Rifle Magnum Primers. Here are the results. My question is what is going on with these groups?


This was the lightest load that I had loaded at 71.8 grains. decent group three shots at right at 3/4 of an inch


This is my second load at 72.4 grains. the group of three is 11/16 or just under 3/4 of an inch


Then this happens. Load threeat 73 grains opens way up top three shots measure 1 13/16 of an inch


This is load four at 73.5 grains. Here my group goes horizontal. The three shot pyramid is gone and is replaced with a horizontal string. What is going on?


Lastly load five at 74 grains. Even more dramatic horizontal spread. What makes a group change shape like this?

It is clear that my rifle likes a little lighter load. the 72.4 grain group that i shot will most likely be the one I load with. It is a medium to hot load but well under the max load in the sierra manual. None of these loads showed signs of pressure and would feel safe loading any of them, however the lighter two loads of the five yielded the best results. What is my rifle trying to tell me by the change in the group shape? Is there any way that i can use this data to further my progress in my load developement?
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Old 05-31-2010, 07:51 PM
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Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
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Re: Reloading for the 300 win. Results Questions

Well there are alot of things going on. I dont know you or your shooting abilty If you where shooting a proven load and rifle I would say its trigger pull.

But sence it looks like you shooting a ladder test I would say its normal. Take your best load and switch the primers try a LR primer and see if it shrinks anymore. Also you can try some hotter charges just dont go over max. Im shooting a 185g bullet and 81g of powder.



Jon

Also I am no expert but I hope this helps
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  #3  
Old 06-01-2010, 03:59 PM
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Re: Reloading for the 300 win. Results Questions

I like the lack of vertical in the 73.5gr load.
Is your barrel free floated and how far off the lands are you?
You may be able to coax the 73.5 gr load together with a seating depth change.
Also what were the wind conditions?
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Old 06-01-2010, 04:48 PM
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Location: So. Utah
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Re: Reloading for the 300 win. Results Questions

Rockz, the rifle barrel is free floated. I was shooting at around 7:00am and the temperature was around 60 with absolutely no wind. Unfortunately like most production rifles the throat is long. I would run into magazine length issues long before I was ever able to reach the lands. Not only that, but the 180 grain game kings have a HUGE boat tail and I would not ever be able to have enough seating surface for the bullet in the neck. I can come forward with the bullet an estimated .050 and still be okay with things though. What would you recommend?
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  #5  
Old 06-01-2010, 07:17 PM
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Re: Reloading for the 300 win. Results Questions

I'd load up some at 73.5 and shoot groups
loaded .025 and.050 longer to see how it groups
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  #6  
Old 06-01-2010, 08:59 PM
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Re: Reloading for the 300 win. Results Questions

Usually when I'm getting the flier that is jacking up my group a little primer test will take care of it. I load the best groups powder charge with all the same seating depth then change the primers. I try to do a Mag and LR primer in every brand I have on hand. The results can be amazing.
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  #7  
Old 06-02-2010, 08:52 PM
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Re: Reloading for the 300 win. Results Questions

Well here's what I decided after hearing what you guys had to say. I took a load between the lightest two and loaded it with varying bullet depths. I loaded five different loads at an even 72 grains. The first seat depth is 3.340, 3.355, 3.375, 3.395 and lastly 3.410. Five different loads with a total span of .070. I would have perhaps Tried for even more but I ran out of neck tension with the bullet and magazine length. I also took the 73.5 grain load and switched up Primers. I also tried a couple of different seat depths with this hotter load. I also like the fact that there is very little vertical variation. I will see what happens early Saturday and post my results.

Last edited by Firecat; 06-02-2010 at 09:53 PM.
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