Thanks for the feedback on Cooper magazines - I've also used a Wisner or two in repro 52C sporters with good results - may try one in this M36.
I've sort of fallen into the deep end of the pool when it comes to 22RF rifles - bought several 52D & 40XB target rifles when the CMP was selling them, and greatly enjoyed being able to experience those fine old American smallbore target rifles at an affordable price. After seeing what was advertised as the "Ultimate 22RF Trainer" based on a Stiller 2500XR action that either EuroOptic or Sport Optic was selling back around 2014-15, I decided to build one myself on the same action - that was the first 22RF rifle I'd ever built, and I enjoyed shooting it quite a lot. Then had Jonathan Elrod convert CMP 40X & 40XB rifles into repeaters using the V22 magazines, and barreled those actions after Jonathan finished the conversions. Then just had to have a V22 repeater action to build on, and sold the 40X repeater to fund that project. Now there are six V22s in the safe, along with a Zermatt RimX, a Browning marked 52C repro, a Kimber Super America, and this Cooper. I wrote about the issues I had with a very poor factory barrel on the repro 52C a month or two ago; the replacement match grade Krieger I bought for that rifle is in the lathe, fitted to the repro action, just need to get it chambered, cut the extractor slots, part it to length & crowned. Now that I've finished the last major fall farm work, I'll get focused on finishing that project, then see what can be done to hopefully get this Cooper to shoot as good as it looks...