Barrel Interchangability

[Prang81]

Hi all
I own an 870 Wingmaster manufactured during 1955 and would like to replace the original barrel with one manufactured in 1973. I understand that after 1969, the angle of the rim cut on barrels was changed from 45 degrees to 55 degrees. Will this change create a problem when mating up with my older receiver? I've checked everywhere on internet and can't seem to find a definite answer. Thank you in advance for your help.

[Synchronizor]

The slight angle change is just around the chamber; nowhere where the barrel interacts with the receiver. It should fit your gun just fine.

[Prang81]

Thank you for response.

[Prang81]

I forgot to ask. Will the increased angle on the rim affect headspace? That is, will the shell set lower in the chamber? Maybe shotguns don't have headspace.
Thanks again.

[Synchronizor]

Headspace is important for shotguns, just like any firearm. I don't think the rim seat angle is going to make that big of a difference, but if you want to be sure, just stop by a gunsmith for a minute and have them toss their go/no-go gauges in there real quick.

[Prang81]

Again, thanks for help! I appreciate it.