Only one I've got that's not factory chamber is a HMR reamed out to .17x28mm, that's based on the
5.7 FNH case.
Put it on a .410 action and cratered the primers. Quick told me that's the problem with the big
firing pin. So I bought a .223 action and put it on there. Works slicker 'ell so far.
Had a too tight chamber neck that's caused problems. Had that reamed out, expecting the barrel back anyday now.
Should be a fine little p/dog shooter out to 200yds. since I shoot a lot of 'em among $10k-50,000 horses and the rancher don't like the blast. Says he'll give me a chance to prove this isn't as noisy. The
horse's don't seem to mind my shooting a .223.
Shucks, had one mare that would point them for me, then when I shot 'em. She'd trot over there and pick them up with her teeth and toss 'em around the 5 acre pen. Funny as can be. But, it's a real pain because the rest of the horse's have to follow along behind her. They do get the exercise running back and forth though, and the barrel will never get too hot this way either. One fell down the hole. She got down on her knee's and stuck her head almost to the eye's down the hole. She sure was proud when she got that one out. Tossed it up in the air half a dozen times, knickering, shaking it, throwing it around. What I'm waiting for is for her to pick up one that's not dead and it bites her nose. Had one lunge at me wide open mouthed once. IF you've ever seen a house cat yawn, that's about what it looked like and this one lunged at least two feet in the air at me with a blown out belly.
Since I started this conversion they've come out with the .17M2, so I've got one of them too. Need a HMR barrel to replace the one I used up.
You must have something in mind, or you wouldn't have started this thread. What are you thinking about making?
George