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by mtngun
Sun Feb 10, 2008 5:33 pm
Forum: pressure measurement
Topic: Cast in 7-30 carbine
Replies: 3
Views: 4918

Re: Cast in 7-30 carbine

'More 7-30 Pressure Trace data: 4895, 3031', 'First off, my validation load traced at 46584 psi compared to 46732 psi at the previous range session, telling me that the strain gage was working normally. Today I was using the usual 160 gr. loverin in the 7-30 contender carbine, except with different ...
by mtngun
Sun Feb 10, 2008 5:43 pm
Forum: pressure measurement
Topic: validation load
Replies: 0
Views: 5575

validation load

from the old forum: 3006 gage #2, validation loads Here's my validation load at the beginning of today's range session, the usual 165 gr. Speer and 58.7 gr. IMR4350. I think the barrel had been cleaned but I'm not positive since I'm not real religious about cleaning my guns. Actual velocity was 273...
by mtngun
Sun Feb 10, 2008 5:46 pm
Forum: pressure measurement
Topic: ignition vs. secondary spikes
Replies: 0
Views: 5157

ignition vs. secondary spikes

from the old forum: Does ignition influence secondary spikes? Here's a repeat of the March 24 cast load with Ramshot Big Game and a 180 gr. cast bore rider, except today we used a CCI #250 magnum primer. There has been no evidence that the secondary spikes are caused by poor ignition, but just to b...
by mtngun
Sun Feb 10, 2008 5:49 pm
Forum: pressure measurement
Topic: loss of faith in Quickload
Replies: 1
Views: 3992

loss of faith in Quickload

from the old forum: More 3006 traces: 4895, 3031, primer falls out. This is the usual 180 gr. loverin in the 30-06. Today I tried faster stick powders hoping to make the secondary spike go away. 50.3 gr. H4895, 2.790" COL, 0.314" HTWW, Rooster HVR, Fed #210. My Quickload prediction was 26...
by mtngun
Sun Feb 10, 2008 5:52 pm
Forum: pressure measurement
Topic: pressure effect of swabbing bore with abrasive
Replies: 0
Views: 5245

pressure effect of swabbing bore with abrasive

from the old forum: 3006 secondary spikes: effect of swabbing bore with abrasive Here's the same 180 gr. loverin and 54.1 gr. Big Game load that is known to create huge secondary spikes. Trace #1 is a "normal" shot, 2619 fps. Then I brushed the barrel with copious quantities of JB's bore ...
by mtngun
Sun Feb 10, 2008 5:54 pm
Forum: pressure measurement
Topic: loss of faith in Quickload
Replies: 1
Views: 3992

Re: loss of faith in Quickload

Here's a picture of the cartridges.:cry: http://www.mountainmolds.com/pics/3006_cases_4_6.jpg When viewed with a magnifying glass, the 3031/4895 cases show an ejector mark on the head and a tiny bit of protrusion around the firing pin, while the validation case does not. Without magnification, you w...
by mtngun
Sun Feb 10, 2008 6:05 pm
Forum: General
Topic: 45 caliber gas checks
Replies: 0
Views: 4732

45 caliber gas checks

from the old forum: Dan - I have one of your molds in .462 cast and am looking at buying at least one other set. Once I got the hang of casting big bullets (430 gr) I am pleased with the casting, but not the gas check. I have to cull at least an additional 25 to 30% because the gas check doesn't st...
by mtngun
Sun Feb 10, 2008 6:15 pm
Forum: pressure measurement
Topic: two strain gages on one gun
Replies: 4
Views: 6783

Re: two strain gages on one gun

3006 pressure trace: 3 gages on one gun The usual validation load, which was averaging 53655 psi at the previous range session. Gage #2, (the gage used at the previous session). The barrel had not been cleaned. The first shot had low velocity and a funny trace, but shot #2 was near normal. Apparentl...
by mtngun
Sun Feb 10, 2008 6:20 pm
Forum: pressure measurement
Topic: lube, vibes, and powders vs. pressure
Replies: 0
Views: 5117

lube, vibes, and powders vs. pressure

from the old forum: 3006 pressure trace: lube, barrel vibes, powders Here's an assortment of experiments attempting to shed light on the secondary pressure spike. Gage #4 (Omega with JB weld), the usual validation load, except the barrel was swabbed generously with Break-Free oil before each shot. ...
by mtngun
Sun Feb 10, 2008 6:22 pm
Forum: pressure measurement
Topic: Cast in 7-30 carbine
Replies: 3
Views: 4918

Re: Cast in 7-30 carbine

730 pressure trace: Varget, muzzle weight Here's a test to see if Varget would make the spike go away. Not! 160 gr. cast bore rider. 30 gr. Varget at 2049 fps, QL predicted 34.6 ksi at 2106 fps. 32 gr. Varget at 2166 fps, QL predicted 41.4 ksi at 2237 fps. 33 gr. Varget at 2224 fps, QL predicted 45....

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