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Ransom Rest Testing

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Post by brassmaster Fri Mar 25, 2016 2:31 pm

This question may be rhetorical. I've done a substantial amount of Ransom Rest testing. After securing the 1911 in the RR, the standard seems to be 5-10 rounds fired over the target to settle the gun in the RR and then, 10 shots on the target for record.
Are these 10 rounds fired in a sequence of firing, returning the gun back to rest using the "push-down knob" and firing again until all rounds are expended or taking a break between rounds, allowing the barrel to cool?
Unlike test firing a rifle for group and letting the barrel cool, a highly-tuned 1911 provides a tight barrel lock up, so, is there less chance for barrel heating to affect the group or not?
As I reflect back on my RR testing, I have never allowed the barrel to cool between rounds. Maybe I have inadvertently affected the outcome of the test.
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Post by AllAces Fri Mar 25, 2016 3:00 pm

In all my Ransom Rest testing I have fired 15 "fouling" rounds, checked the tightness of the gun in the rest, followed by five rounds with about 10 seconds between rounds, followed by another 5 rounds with about 10 seconds between rounds. A key to getting good results is to follow the same shot plan with every group. The firing lever is positioned in the center of the trigger and after each shot the gun is returned using the push-down knob.  I try to use the same amount of pressure on the push-down knob with each shot.  It goes without saying that the rest is firmly clamped or bolted to the concrete pillar and all rest adjustments such as windage and clamping screws are fully tightened.  If you follow your ransom rest shot plan you should get consistent results.  Of course there are other variables such as powder load, crimp, bullet weight, wind, temperature that can affect groups.
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Post by brassmaster Fri Mar 25, 2016 4:07 pm

Thanks for the reply ALLACES. I assume from your explanation that 10 seconds between rounds is sufficient or barrel heating is not a concern?
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Post by AllAces Sun Mar 27, 2016 10:57 am

brassmaster wrote:Thanks for the reply ALLACES. I assume from your explanation that 10 seconds between rounds is sufficient or barrel heating is not a concern?
I feel the best results are obtained with the barrel warm from shooting the fouling shots, then by shooting ten shot groups.  If I'm testing several different loads I put up a full size 50 yard target, then using the windage and elevation adjustment move the gun around to shoot groups in each quadrant and the center of the target space.  I pre-load sufficient magazines to test all loads without having to stop and load magazines.  I keep notes in a notebook regarding the gun used, ammo specs, date/time, temperture, and a diagram showing where on the target each group is placed.  Afterwards I put all that info on the target and retain with my load data files.

I keep my ammo in a small insulated cooler and on days when the temperature is below 65F I will add a couple of those chemical hand warmers to the cooler.  I even do this on cold days when I'm shooting a match.
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