have never fired a factory round through the rifle. Winchester primers same on both ammo and primed shells. the pin strike on the loaded rounds is shallower than on the primed cases I was about to make a new batch of ammo by the numbers. could the crimp be too tight?Have you tried any factory ammo or is it all reloads? What primers are you using? Were they the same primers as the ammo you were using? Do the rounds not firing have any marks on the primers? How is you o.a.l, have you tried varying it?
That was my first thought but that wasn't it. Thanks for the reply.Try holding the trigger to the rear when pulling it. With my 20 USH if I don't do that I get light primer strikes. When I do it it goes bang everytime.
Now that I thought more on it I leaning more toward an ammo issue simply because if it were mechanical issue the rifle wouldn't fire at all, Make sense??? BTW Thanks for the reply.I'd start by changing the hammer spring out for a single coil Wolff EP spring and checking firing pin protrusion, are the brass and primers the same in all rounds, as Ocho queried? Brass with slightly different rim thickness and/or primers may make a difference, a new hammer spring and good pin protrusion would help, may also be a bad transfer bar.
I can't imagine crimp causing a primer not to detonate, although weirder things happen so who knows. It does sound like an ammo issue, maybe you seated the primers slightly differently from one batch to the next. Easiest way to check would be to fire some factory ammo, and see if that has the same issues. Of course finding 444 right now is a challenge. Checking the firing pin to see if it is in spec seems like a reasonable idea, or swapping out the hammer spring to something a bit heavier.
this is an H&R rebarrel from their rebarreling program. rifle came in 223Is this one of the early blued Ultras (ejector 1:38"), or a stainless Ultra t-hole (extractor 1:20") ? The SS Ultra 45-70 had problems with a deep rim cut, it's possible the 444 version did too. If so, increasing pin protrusion up to .050"-.060" by removing a smidge off the tip of the hammer should solve the problem if the current protrusion is minimal.
I've read some data that crimping can increase accuracy minimally, crimping with some pistol powders like 110/296 can also improve burn/accuracy, I only used the Lee factory crimp die on rifle chamberings, crimping with a seater die was somewhat a can of worms for me, so I never liked using it.
I checked OAL and found the ammo to be 25 thousands short of max, thoughts?have never fired a factory round through the rifle. Winchester primers same on both ammo and primed shells. the pin strike on the loaded rounds is shallower than on the primed cases I was about to make a new batch of ammo by the numbers. could the crimp be too tight?