Quickload for optimum load selection, or not.

414gates · 2024-05-30T07:59:56Z

It's been mentioned a couple of times to me, that QL is an economical way to find optimum loads, or loads that are POI stable in spite of moderate temperature changes.I've done some reading on the subject, and from the information available by people who have done this, the subject of Optimum Barrel Time is involved.To begin formulating an indicative prediction from QL, you have to measure your case capacity. This is typically done with water.Then, you have to true the powder burn. Then, you have to test a small range of charges around the QL prediction, to verify it is actual.The concept of optimum barrel time is complicated.OBT Explained This statement by the author is important :"I was able to arrive at the optimum charge weight almost without any workup, as I could start just below the weight predicted, and observe the groups as the charge was slowly increased. "And leaves me to conclude that the mathematics involved in OBT are to explain why the OCW method works.I'm not sold on load development with the Quickload OBT idea. There are many critical variables, and with anything complicated, something easily goes wrong.Firstly, measuring case capacity is difficult and time consuming. Try it yourself, measure the same case capacity 5 times.Secondly, you have to shoot some rounds to determine maximum safe pressure. Third, you have to shoot groups around the QL prediction, to verify it is true.Getting close to a predicted node and testing charges around it is in fact what OCW is for.I can find an OCW node in 16 rounds. 4 rounds per charge, 4 charges, spaced 0.5% apart. I don't have to care about measuring case capacity, and I don't have to fire test rounds to true the powder burn for QL.I will then use 12 more rounds to confirm the node by loading 4 rounds each at the mode, and 0.25% above and below.It could be argued that the number of shots can be reduced to 3, I prefer to use 4, in case something goes wrong with 1 shot, then three remain to paint the picture.Can a QL predicted accuracy node be developed and proven on target in 28 rounds ? If you use QL that way, please share the details of your process, with attention to the total number of rounds required to reach a conclusion.

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Reloading Methodology

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janfred

(@janfred)

Posts: 415

Reputable Member

I have confused myself with the figures presented as I used 2 different lots of S365 with a big variation in burning rate. The principles shown however depict the correct method.

Node 5
GRT 40,3gr = 2850fps
QL 41,55gr = 2927fps

So, which one is correct?

Posted : 06/07/2024 7:30 am

Tripodmvr

(@tripodmvr)

Posts: 739

Prominent Member

I have a lot more experience with QL and will use a charge of 41,5gr and see how the gun performs. That speed of 2927fps conforms with a 100gr bullet at 2960fps on a node.

Posted : 06/07/2024 8:00 am

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Quickload for optimum load selection, or not.

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