I don't think you need to worry about burst pressure too much here. The reason for the 4:1 ratio is to accommodate an occasional spike in pressure and give you lots of safety cushion, so to speak.
If you use SAE 100R2AT as I mentioned before, the 1/2" size is rated for working pressure up to 3,500 PSI. The minimum burst pressure is four times that, or 14,000 PSI. I seriously doubt your system is going to see pressure spikes that high.
Smaller sizes, like 1/4" and 3/8" are rated even higher.
Because SAE 100R2AT is very common, it is also extremely economical. We sell 1/2" ID for only $1.64 per foot ( $1.56 when you order online at www.DiscountHydraulicHose.com ). Fittings and assembly are slightly more.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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