I need help Please!!

[Ace Lungger]

Howdy Pards,
I finaly got to shoot my Sharps this evening, I noticed that the primer indention on a shot case was pushed  back like they look when you decap them. 5 shots and then it won't shoot any more! I took it aprt and did all the cleaning, and while I had it apart you could push down where the hammer strikes and the firing pin just coes out a faction, I did not tear the block apart,  what is causing the primer blow back, I am using 57 grains of FF, droping down a 24" drop tube, using a 60thosands wad and 500 grain pure lead bullet, seated so that you have to push the last 1/4" in by hand, seating the bullet in the riflings! Please, Please help me. The gun is New, this was the first time it was shoot!
Thanks In advance!
ACE

[Frenchie]

I've been re-reading David Chicoine's Gunsmithing Guns of the Old West and I'm thinking, maybe too much head space? If the cartridge can slide back during ignition, the pressure could force the primer out. I have no ideas on why the firing pin won't come out.

[Ace Lungger]

Frenchie, that is what i thought to, but is was a case of head up the a$$
Normal me, didn't know the gun had a saftey, and I prime my 45-70 with a lee auto primer while laying in bed becauuse of my back, and I grab a box of pistol primers instead of rifle!

Thanks so much for trying to help me out!! I is nice to know that there are people out there willing to help others!!
Thanks
ACE

[Frenchie]

Well, geez, Ace, don't be reloading while lying down! Too much blood going to your head, clouds up your thinking 

[Angel_Eyes]

Hey Ace, personally I would give your bullet about 30 thou "jump" to the rifling as you could be getting a pressure spike. I don't like forcing a cartridge to seat in the chamber. My favourite 'Buffalo' load is 53gr ffg behind 550gr Postell . (These have a slimmer pointy bit so load in the chamber better)

Regards, UKshooter.

[Ace Lungger]

 :)UkShooter, This is my very first experence with this type shooting! And you could be right! The reason I did that is because I have read where a lot of the BPCR pards load that way, I mainly picked that up from Dick Dastardly, I wished I knew the just the perfert way? I read when shooting pure or allmost pure lead bullets, if you let jump you could get a boncing bullet? I am going to seat them a little deeper next time!
I thank you for your advice, when I was young and did a lot of smokeless long range shooting (of course used jacket bullets) I worked real hard on super tight group at long ranges. Now, that isn't going to be a possibility with my health issuse, but I still want to  do have the most accurate load I can make, I need all the help I can get know days!!!

I will put that in my loading book about 30 thou jump.
Thank you again for the advice.
ACE