LOTS of WLBXR's available here

[DMTJAGER]

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https://www.gunbroker.com/Shotgun-Shells/search?Keywords=12%20gauge&PageSize=24&Sort=13&View=1&PageIndex=3&Ch-manufacturerName=Winchester&Ch-model=Long%20Beard%20XR

12ga 3" and 3.5" #4, #5 and #6 shot available.

And here:
https://www.targetsportsusa.com/winchester-long-beard-xr-12-gauge-3-1-2-2-oz-5-shot-lok-magnum-lead-stlb12lm5-p-109284.aspx

Must state that the picture and add say 12ga 3.5" 2-1/8oz #5 shot but the item description reads 2oz#5 shot. I ordered 5 boxes before I became waware of the discrepancy, and couldn't cancel my order in time but thankfully 5 boxes of 12ga 3.5" 2-1/8oz of #5 shot arrived as advertised.
I would still advise calling Target Sports USA prior to ordering. No rush as they show 99 boxes in stock as of today.
Hopefully the Target Sports USA shells are indeed as advertised as they are at the best price I can find.

[Sir-diealot]

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No 12 3" # 6 1050fps of course. Thanks for sharing though.