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Old 07-24-2012, 08:53 PM
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Competition Electronics ProChrono Digital Chronograph with Competition Electronics Digital USB Interface , hooks up to my laptop





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Old 07-28-2012, 12:33 PM
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Yes, I am ready for part two of my load work using four different groups, two different powders and two different bullets for a total of 20 rounds to be fired at the range Monday morning.


First: a five shot group using Sierra 220gr with Magnum and a five shot group using Nosler 20gr Accubond with IMR7828

Second:
a five shot group using Sierra 220gr with IMR7828 and a five shot group using Nosler 200gr Accubond with Magnum
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Old 07-30-2012, 10:13 AM
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Today was an interesting morning but you talk about hot and humid. Once again to remind everyone, this is an out of the box rifle with no glass bedding or pillar bedding and this rifle uses a pressure point up close to the end of the for end. No, I do not have any intention of changing it at the moment. But today was a very good day of discovery. First, 200gr Accubonds give me great velocities but the accuracy is very poor. I have tried now different loads with RL-25, RL-22, MRP, Magnum and IMR7828 and the groups are embarrassing to say the least. My rifle simply does not like them. I have 100 200gr Accubonds left and will trade them for some 200gr Partitions if someone is willing to do so, and if you are willing please pm me about trading.

Magnum powder preformed well, my barrel did not get as hot to the touch as with the other powders and accuracy was fair to good but average velocities were 2951fps with the 220gr and that was disappointing. Now IMR7828 did very well in velocity with the 220gr SBT and accuracy was good and this was with one grain under book max. I am very please with this powder and the Sierra SBT. I will be soon testing 250gr bullets and also some 200gr (forgive me for even using these words and don't remind me of my dislike for terminal results I get with the :mrgreen: - Barnes TSX).


220gr SBT, 83.0grs IMR7828, Rem brass, Rem 9 1/2M primers, 3016fps, OAL 3.600" .964 minus first round which was first round out of a clean barrel. After ten shoots this group should tighten up a little more once the barrel is fouled good.



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Last edited by CircuitRider; 07-30-2012 at 10:23 AM.
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Old 08-02-2012, 12:56 PM
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Man, this 250gr Barnes orginial in 8mm sure makes the Sierra 220gr SBT look anemic. :shock: Can't wait to work with this bullet, but that will be when the weather get just a little cooler. :mrgreen:

What a cool looking beast and if I can get around 2800fps (hopfully) WOW!
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Old 08-09-2012, 03:40 PM
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Well, I did some more range work with my 8mm Rem Mag and I have discovered that my rifle does not like 200gr Accubonds or Partitions, but does like 220gr Sierra and 250gr Barnes Originals.
First: The 200gr Accubonds will give me 3154fps and the Partitions will give me 3137fps. These are awesome velocities but accuracy is not acceptable to me running 1 at best to 3 for most groups.



Second: The 220gr Sierra SBT gave me last time I was at the range working with this bullet 3016fps on the average. This time 3018fps on the average with 21 Extreme Spread and 9 Deviation and a three shot group size of .487 This was the seventh and last group I fired and still had this level of accuracy after all that recoil. The first group I fried was after one fouling round from a clean barrel and it was a three shot group that was .849 and it had an Extreme Spread of 20 and a Deviation of 9 giving me 3017fps.
Three shot group .487", 220gr Sierra SBT, 3018fps average

Three shot group .849", 220gr Sierra SBT, 3017fps
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Old 08-09-2012, 03:41 PM
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Third: There were the two groups I fired using the 250gr Barnes and was 5% with below published max with one group and 4% below max with the other group, giving me from 2701 2720fps as I was testing in the margin of safety to make sure I did not get close to max pressures with this very soft bullet. Of course I will now increase my charges moving toward max hoping to be over 2750 2800fps with an accurate load. Group sizes were as follows as I increased the powder charge from 5% to 4% below max. Best group was .447 with Extreme Spread of 22 and Deviation of 11, and worst group was .8485 with Extreme Spread of 22 and Deviation of 11.
Three shot group .447", 250gr Barnes Original 2720fps

Three shot group .8485" , 250gr Barnes Original 2701fps
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Old 09-20-2012, 03:22 PM
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Today I decided to test my extended load work with my hunting load for my 8mm Rem mag and also looking for better velocities for my 250gr Barnes Original. My average today with the 220gr Sierra was 3003fps and this is due to me using after I full sized my brass an expander mandrel expanding the diamater of the neck .002 and then using the regular mandrel for my Sinclair neck turner. This reduced the neck tension which also reduced my pressures and velocities from 3018fps on average to 3003fps but group is much tighter. Was able to get the 250gr Barnes Original to 2749fps and what was amazing today was all three of the rounds were 2749fps.







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Old 09-25-2012, 11:16 AM
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According to Q/L the 180gr GS Custom has a BC .463, 4175ft pounds of energy at muzzle using IMR7828, still 2000ft pounds of energy at 560yds, 2.4" high at 100yds with a zero of 270yds, -5 at 350yds not bad not bad at all - plus still moving at 2174fps at 600yds and the GS will open up at 1500/1600fps (these ballistics are calculated at 4,000ft the lowest elevation I will encounter in Arizona where I am thinking about using them).

Now if GS will return my email about a USA distributor since they are setting up shop in the USA to manufacture the GS Custom I will get them faster. The GS out performed the TSX and TTSX in my 257Wby and 30-06 on terminal results on deer when I used them alternating between the two bullets during a 3yr period. Also, I have been able so far with 200gr, 220gr and 250gr bullets to duplicate with my Big 8 the velocities Q/L estimated and in one case even higher velocities. This will be truly interesting when I get some.
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Old 09-26-2012, 10:11 AM
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Well, I have my name added to GS Custom Bullet list to notify when they start production in the US. I will wait till then, the prices are to high for the bullets shipped from South Africa. Including shipping from South Africa for a box of 180gr is 87.00 and one box of the 170gr is 83.00 and I would need at least two boxes of either one to do proper load work and have enough for practice at distance and final sight-in. I will wait!
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Old 09-26-2012, 10:55 AM
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Quote:
Originally Posted by CircuitRider View Post
I will wait!
At those prices, good call!
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