Modern Sporting Rifle Evolution
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Nomadic

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Made it to the range yesterday and got some initial data.  I was testing for velocity nodes and not groups.  Good thing, because I put my scope on a new set of QD mounts and the tension on the QD levers was not tight so I discovered my scope was wobbling all over the place.  Anyway, fps data is below.  All shot with 3 shot groups.  Listed as AVG, SD, ES (if recorded)

Starline 1-fired brass, CCI 450 primer, 2.255 coal.  SWBO powder

23.0  2612, 20.0, 40
23.3  2679, 42.1, 79
23.7  No Reading (forgot to reset Magnetospeed)  slightly compressed

This was nowhere near acceptable velocity.  Will not be doing anymore testing in this brass.


LC 1-fired brass, CCI 450 primer, 2.255 coal.  SWBO powder
23.2 2633, 29.3
23.5 2663, 44.9
23.8 2754, 25.3
24.2 2754, 13.1, 26

I think i have a little more room for powder in the LC brass, so will do a 5 shot group with 24.2, and up (to slightly compressed).  I might also run separate 3 shot groups for grouping.  My magneto speed usually does not affect grouping on this rifle, so I will have to decide on this later.

I was getting 2724 fps from my 100 AB at 24.2 and that load was slightly compressed.  I should have a very slightly increased amount of space in the case with the 100 MDWS.  
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Nomadic

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I did a little more testing and I’m going to change an above statement:

I think 24.2 is compressed. I believe compression starts right around 23.6 of SWBO in LC brass trimmed to 1.33-1.35
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kshunter

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Reply with quote  #3 
You might already, but if not try using a drop tube. It made a world of difference for me.
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Nomadic

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Quote:
Originally Posted by kshunter
You might already, but if not try using a drop tube. It made a world of difference for me.

I do use one. RangerJoe introduces me to it. Amazing how much difference it makes
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Nomadic

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Made it to the range today. Shot groups of LC brass, CCI 450, 2.25 coal SWBO powder

23.3 not compressed
23.6 compressed
24.0 compressed
24.2 compressed

None of them shot worth a damn. I did not even bother measuring.
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RangerJoe

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Reply with quote  #6 
Is the TPF* in good shape?

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* Trigger Pulling Finger.   [rofl]

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Nomadic

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Could have been. I will try again but I’m going to increase seating depth. I run Lancer mags which allow out to 2.285.
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RangerJoe

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Love those Lancers!
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Nomadic

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update on Lancer mags. Realistic max coal is 2.265. Anything over that and the nose drags
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Nomadic

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Reply with quote  #10 
Made it to the range today and it was very disappointing. Comedy of errors, except it’s not funny when you drive 45 minutes to the range and collect very little useful data. Here’s what I got from today:
Tried new Hornady brass. Shoulder measured using .350 Hornady gauge was at 1.213 before firing. 1.238 after.
23.6 and 23.9 SWBO at 2.265 oal looked promising and require further testing. I will try it in the once-fired brass.
Pressure:
1 small swipe on the 3 rounds of 23.9
Blown primer on 3rd round of 24.2
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