Sub sonic ammo is usually very quiet but I would still wear hearing protection since the .22 rim fire is responsible for more hearing probable than any other cartridge. It has a very high pitch frequency that is hard for humans to detect, I would still wear hearing protection while shooting it.
I used a different brand just yesterday to make my first groundhog kill of the season. 

I suppose we will never know how or why 6 of the 20 people working on that bridge died. It turns out that there is a billion-dollar insurance policy on that bridge. The ship's insurance is another subject.  The last times I drove to Maine was from Ocean City, taking US13 to the Delaware Memorial bridge on I-95, bypassing Baltimore. My ex SIL was stationed at Brunswick NAS.  Friends in Md. were heading to see their daughter and SIL in Conn. today but put off the drive with the news of the bridge.

There are other routes then I-95 to get from Florida to the northeast. I would take I-95 into South Carolina and pick up I-77 north to I-81 north to Scranton and get off on I-84 east which will link back up with I-95 outside of Boston or you could get on I-80 off I-81 at the split north of Harrisburg and run that into Jersy.
Just pick your poison. I-95 threw North Carolina to Boston is a death trap and an accident waiting to happen.
I didn't know that they stopped trucks from using the New Harbor tunnel in Baltimore, the old two-way tunnel maybe but not sure about that either since I tried not to use either, but I have hauled millions of gallons of #2 heating oil and diesel threw both when working for Hahn Transportation. God only knows how much sugar out of Domino Sugar also.

Got too many options , but the 1911 .45acp would be my carry and a 12ga 1300 riot gun loaded with buck and ball would be near by along with my Korean police action M1 carbine with 30rd magazine.
If I was in Florida I would have signs posted LOOTERS MAKE GOOD GATOR BAIT LOOK OUT FOR MY PET GATOR!!!
CLAYMOR MINES IN YARD.

The mango trees are in full bloom here. The fruit usually shows up late April till mid May. A tree fresh mango in the blender with some ice and some vodka is great! 

Yep it's spring here. 3 more inches of the white stuff. helps build up the water table.

If I could I would catch that bugger and tie him out in this snow.

you have some weird weather down there. I really don't think I would like living down there.

I have a small history with the .338 cal, 2 of which are the .338 Wm, one was a Ruger M77 Hawkeye all weather which I got off GB with a low ball I didn't want it bid. No one had bid on it and it had been listed multiple times, I placed a last minute minimum bid and won it.
I already had my 35Whelen AI and really didn't need it or want it. The 35 Ackely will produce the same muzzle energy as a 375 H&H and is faster than the .338Wm.
The Ruger had issues and probably is why it was on GB. A new stock with a full bedding block and a few rounds of fire lapping cleaned it up and settled it down, it thought it was a sniper rifle after the fire lapping and cleaned up easier.
I sold it after hunting with it in Montana, it was too heavy to carry.
I did like the .338Wm cartridge and found a M70 classic for sell on the Fire and after some haggling I bought it for less than I got for the Ruger M77 which I made money on even after all the work I did to it, plus it shoots as well or better with the right ammo.
The 35 Whelen Ackely is a custom barrel job on an older M70 CRPF action that shoots like a lazer.
The first White Tail I killed with this rifle I had to take a Texas heart shot or let it go but it was the last day of the season and I was hungry. I had some left over 225gr Nosler PTs load up at over 2900fps and took the shot in a heavy thicket, held on the top of the tail hoping to hit the neck or the spine just above the tail. The bullet struck the spine and literally split the deer in half.
The old saying of eating up to the bullet hole of a 35 Whelen held true since there was no blood shot meat to be cut away.
Got to love the medium bores.