On two of my resently acquired Mod. 200 Stevens rifles I've blown primers with loads that seem just fine in other rifles. Further the amount of time it takes to remove copper and clean these barrel is exhorbatent by a lot.

Could these rough bores be the cause of the over pressure? are there any cases evidence of this happening? Are there any test results indicating this?

I realize there can be many causes of popped primers, but a greater restriction than normal to the bullet moving down the barrel indeed would increase the pressure build up in the rifle's chamber and barrel.

Is there anyone out there that has experienced this? roger

I have not seen any articles about this but i agree with you thought.
I shot a lot of 45/70 black powder lead bullets and the one guy I shot with for a while
talked about putting a choke in the barrel to increase pressure, he thought it would improve the internal ballistics?
I would however check the head space just to make sure.. something may have changed ouer pressure loads could have set the bolt back.

Excessive copper fouling can cause high pressures.

Very high pressure, thin-cupped primers, or long firing pins generally cause punctured primers.

What are you loading in those 200s?

quote:

Further the amount of time it takes to remove copper and clean these barrel is exhorbatent by a lot.

I purchased a Savage FP10 in 223 which was a tack driver out of the box. It did, however, foul the barrel quite badly for the first 40-50 rounds. Now it is one of my least fouling barrels, so there is hope.

Regards,
hm

quote:

Originally posted by MickinColo:
What are you loading in those 200s?

The two that are giving the most grief are a .270 and 22-250. The .223 ain't thatgreat either. roger

Maybe the David Tubb Final Finish bore lapping bullets are worth a try? I've read good things about them and have a box for my .243 waiting for a trip to the range.

LWD

That's odd, I have the stevens 200 in .223 and use it a lot for shooting varmints. No pressure problems, no fouling isues, and it shoots real well.

Hope you resolve your issues. Oh, and yes, if you do have excess copper build up it can cause higher pressures.

Hey Roger, You are the MOST Snake-Bit Savage owner I've ever known. At least it keeps everyone else from getting the BAD ones.

You might want to check the end of the Firing Pin, or maybe swap it out with one of the other ones to see if it could possibly be creating the situation.

And of course, quit yanking the Trigger so hard!!!

I presume you meant primers blown out of the case. That's pressure for sure. Those savages all have long firing pins and heavy springs. How the pin fits the hole and tip shape and protrusion are all important to check if its primer piercing.

Roger,

I wished I were there to see in person what’s going on. You said the following.

quote:

I've blown primers with loads that seem just fine in other rifles

That makes me suspicious about the firing pins but may not be the only answer, like I said I wished I was there to see what’s going on.

PS,, Where’s your dad? I haven’t seen him post for a while.

quote:

Originally posted by MickinColo:
PS,, Where’s your dad? I haven’t seen him post for a while.

My dad went to the happy hunting grounds over twenty years ago. roger

Damn! How time flies!

quote:

Originally posted by N. S. Sherlock:
I presume you meant primers blown out of the case. That's pressure for sure. Those savages all have long firing pins and heavy springs. How the pin fits the hole and tip shape and protrusion are all important to check if its primer piercing.

No piercing just popping, roger