3" mags, 2 3/4" chamber.
We keep a side by side 12ga in our gun safe to use as a prop in our Hunter Ed classes. It's ruined, the lump is hammered and the gun closes with about .015 slop, you can shake the action or flex it and see light through it between barrels and receiver. It's been fired too many times with 3" mags.
There are STILL "veteran duckhunters" out there who share the "SECRET" that you can shoot 3" mags in ANY 12ga SHOTGUN!! Of course the guns buck like the proverbial mule (which serves to convince the "veteran" that it's "really shooting hard!") They go on to brag about taking ducks/geese at monstrous yardages with their souped up shottyguns......
Obviously none of them are reloaders!
Another thing that's bugging me right now is this ludicrous idea that the new blackpowder substitute FFF powders like Shockey's Gold and Triple-7 are "the best all around powders." You just buy one powder and use it for everything. A friend of mine just went to the "best" gunstore in our area and had them set him all up with a new 50cal Knight inline. They sent him on his way with 4lb of Shockeys FFF, 405gr lead Power Belts and musket primers and the instructions as follows:
"Start at 90gr. Go up in 5gr increments. The groups will tighten up, the get big, then tighten up again at about 110gr..... this is your load."
I called the store.
I called American Pioneer Powder.
I called three muzzle loader "experts".......
And they all said "Triple F will work just fine."
Dude's getting SLAPPED! His priming caps are splitting like tin cans with an M-80 inside and the gun shoots about 10 inch @100yds.
What can I say? And this guy is bright. He TRIED to cover his bases. Problem is, he bought the gun for a hunt the next day..... He's never worked with black powder stuff before so he drove 50mi to the best gunstore around. He picked it up from the store, asked all the right questions of the sales people and them brought it right over to my range to sight in and get it ready. By the time we had it on target it was dark and his hunt was next morning. He figured he'd just take 50yd shots and learn more later. Hopefully he'll come back later and try some FF and do a real load workup.
And I've watched as the same local gun stores happily peddled 7MM Weatherby Mag to Remington Magnum owners....."We're all out of 7MM Rem Mag but we've got lots of Weatherby ammo, It's more expensive but you know...The Weatherby Premium..."
And GAP ammo for 1911's...... Had a guy the other day ask me why his new .45 was misfiring........ I called the store and their "apology" was, "BRING THE AMMO AND THE GUN IN RIGHT AWAY AND WE'LL SEND IT BACK TO THE FACTORY TO BE TESTED!!!" Ohhh, and "turnaround on these is about 8-10wks."
We try every day but sometimes it feels like Ron White is right, "Ya' can't fix STUPID."
al