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284 Thor Progress

 
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Old 02-10-2011, 06:54 PM
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284 Thor Progress

I played hooky from work today. I loaded 33 rounds for my 284 Thor that Travis Redall built for me. With the ammo loaded as well as the truck I headed to the range 2 miles from my house.

Load info is as follows.Norma brass, Berger 180 vld hunting bullets,Fed. 215 Gold Metal primers. US 869 powder. I started the loads at 97.5 gr. and worked up in tenth incriments ending at 98 gr. I loaded 5 rounds for each weight Except the 98 grain load I only loaded 4 rounds due to fire formed brass I had avialable to load.

I cleaned the rifle barrel after every 2 shots as I am breaking in the barrel.

Results are as follows:
Group 1 1-3144, 2-3144?, 3-3180, 4-3187, 5-3154 avg.fps.3161.8 ES.43fps. Group size .558

Group 2 1-3154, 2-3190, 3-3167, 4-3163, 5-error avg. fps.3168.5 ES.36 fps. Group size .545

Group 3. 1-3161, 2-3189, 3-3165,4-3223,5-3208 avg.fps.3189.2 ES.62 fps. Group size .538.

Group 4. 1-3153, 2-3134,3-3158,4-3164,5-3170 avg.fps.3155.8 ES.36fps. Group size .550

Group 5. 1-3203,2-3186,3-3195,4-3177,5-3205 avg.fps.3193.2 ES.28 fps. Group size .520

Group 6. 1-3181,2-3253,3-3215,4-3248 avg.fps.3224.25 ES.72 fps. Group size .540

I went back to the loading bench and loaded 4 more rounds at 98gr. and raced back to the range trying to beat the snow that was headed my way.
The picture below is the result. I cleaned my rifle completely befor sending the last 4 rounds down range. Not cleaning every 2 shots this time.

Here is my surprise. The same powder load as the last group of shots in the previous session.

This group is as follows:1-3248,2-3253,3-3251,4-3242 avg.fps.3248. ES.11fps!! Group size .512!!!

The group sizes I know can be me. But the avg. fps. and the ES. are what have me somewhat puzzled.

Just the same I will continue with the 98gr. load and see if the results I got in the last shooting session today continue on.

Thought I would share this for those interested.





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Old 02-10-2011, 07:10 PM
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Re: 284 Thor Progress

One thing about mine, the groups weren't all that impressive at close range. With the low es. I seen some fantastic results at 300 to 600. I am betting you are going to be really happy when you go out farther.


Brent
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Last edited by blipelt; 02-10-2011 at 07:11 PM. Reason: More info
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Old 02-10-2011, 07:15 PM
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Re: 284 Thor Progress

One thing about mine, the groups weren't all that impressive at close range. With the low es. I seen some fantastic results at 300 to 600. I am betting you are going to be really happy when you go out farther.


Thanks blipelt your info was helpful to find a starting point for my load devolpment with this rifle.
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Old 02-10-2011, 09:26 PM
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Re: 284 Thor Progress

May I ask your COAL for the round as it may be a suitable replacment for my HOWA when I'm finished with this barrel?

Jon
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Old 02-10-2011, 09:38 PM
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Re: 284 Thor Progress

COAL is 3.420

Ogive is 2.718
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Old 02-10-2011, 09:43 PM
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Re: 284 Thor Progress

Quote:
Originally Posted by RH300UM View Post
COAL is 3.420

Ogive is 2.718
Thank you great post
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Old 02-11-2011, 04:00 AM
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Re: 284 Thor Progress

I'll pass on the advise Jim See gave me when I was developing my load. LEAVE THE CHRONY AT HOME!!! Shoot your groups at 300 yds and go from there. If you see a good one at 300, move out to 600+ and see how it does. When you find a load that groups consistently good at 800+ yds you will have a low ES. Then shoot over your chrony to see ABOUT what your velocity is, if you use a ballistic calculator for drops. That will get you close and you can use your actual drops to fine tune your velocity. After I did this I easily found a load that shoots 2.5" at 800 yds all day. I was just too concerned about the numbers the chrony spit out.
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