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by mtngun
Sun Feb 10, 2008 5:52 pm
Forum: pressure measurement
Topic: pressure effect of swabbing bore with abrasive
Replies: 0
Views: 5043

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 5:49 pm
Forum: pressure measurement
Topic: loss of faith in Quickload
Replies: 1
Views: 3772

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 5:46 pm
Forum: pressure measurement
Topic: ignition vs. secondary spikes
Replies: 0
Views: 5003

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 5:43 pm
Forum: pressure measurement
Topic: validation load
Replies: 0
Views: 5422

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 5:33 pm
Forum: pressure measurement
Topic: Cast in 7-30 carbine
Replies: 3
Views: 4708

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 5:20 pm
Forum: General
Topic: tumble lube bullets
Replies: 0
Views: 4161

tumble lube bullets

from the old forum: I was wondering if the bullet design program can produce a bullet with microbands like Lee produces. I like the tumble lube idea, and versatility. Thanks, Answer : 'No, in fact, there will eventually be some changes to the program to increase the minimum band size, proportional ...
by mtngun
Sun Feb 10, 2008 5:10 pm
Forum: hi velocity
Topic: Paper patch in 30-06: with and without a GC
Replies: 3
Views: 8676

Re: Paper patch in 30-06: with and without a GC

............ To start with, let's think about whether or not the paper can handle rotational forces. True, paper has a very high tensile strength, much, much, higher than lead. But, conventional wisdom -- and I will be the first to be question conventional wisdom -- says that the paper is cut by the...
by mtngun
Sat Feb 09, 2008 2:32 pm
Forum: General
Topic: snowed in
Replies: 5
Views: 4291

Re: snowed in

Neighbor's barn, looking down into Snake River Canyon. Seven Devils mountains on the horizon.
by mtngun
Thu Feb 07, 2008 3:31 pm
Forum: General
Topic: Cast Bullet Velocity Parameters
Replies: 2
Views: 3498

Re: Cast Bullet Velocity Parameters

My experience with wads is limited to a few experiments with NECO wads under gas checked bullets. If I remember correctly, the wads didn't help things one iota, so I didn't pursue them further. Gas checks make life far easier, even at lower velocities. Plain base rifle bullets are for someone who ju...
by mtngun
Thu Feb 07, 2008 2:17 pm
Forum: revolvers
Topic: BFR 500 S&W
Replies: 0
Views: 4874

BFR 500 S&W

Here is a customer's design for the BFR 500 S&W. This design will NOT chamber in S&W revolvers. For S&W's, shorten the nose to 0.690" or thereabouts.. I can't vouch for the measurements -- you might want to verify the bore diameter, for example -- but overall this looks like a decen...

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