I'm thinking of a whisper/woodswalker cartridge for walking around in the woods of Maine.Potential moose,coyote,bear and deer. Does anyone have any experience with the 300, 375, or 338 whispers from ssk?

There are people on here that do. What are your specific questions? Are your intentions sub-sonic with a can or super-sonic?

You say moose and bear... That is a whole different deal than coyotes and deer.

What are you trying to do specifically?

Just curious.

I have a 300 whisper in a pistol. I wouldn't shoot a moose or bear with it. Not enough gun in my opinion. I don't have any experience with the 338 or 375 whispers.

I looked into the 300 whisper. It's a great round for the AR platform but in a single shot pistol I couldn't find anything it would do that I couldn't do with a 30-30. The 338 whisper is a good paper punching round but it is said the 375 is better for hunting. They may be fine for bears hunted with hounds but I wouldn't hunt anything bigger than deer with any of them. I don't have enough experience hunting with subsonic loads that depend on tumbling after hitting an animal to cause damage. I just have a hard time with trusting that it is stable enough to shoot accurately to 300+ yards but reliably tumbles at 50.

Exactly. I prefer the 300 Screamer to the Whisper, but neither is what I would call enough gun for moose.

I love the little 300 Whisper and the biggest advantage over the 30-30 is the lack of recoil in the Whisper. I wouldn't suggest using it for moose or bear either. With the right bullet it will work well on deer and smaller.

I've taken about 80 deer with the subsonic .300, 5 with the .338, 5 with the .375, and 10 with the .500 (all subsonic).
The .500 is the most impressive, but also extremely expensive to build and reload for. The .338 and .375 are a little expensive and not too easy to load for due to the lack of appropriate bullets. The .300 is the most versitile and reasonable one to own. Many bullets are available and reasonable cost. The round itself is just wicked. Certain bullets will drop deer in their tracks. About every appropriate bullet works. Recoil is nonexistant. Sound is almost nil. Other animals have been easily taken with it. How far does it work? My longest shot was 270 yds. I took several this summer from 200-250 without any problems. It's the most practical option for a subsonic gun.
If you're asking about the .300 supersonic, or .300 Screamer, as I call it, I have no experience with it and never will. The real Whisper is just too much fun.

wvhitman what kind of results have you gotten on deer with the 300. Of the around 80 you have taken how far do they travel on average? I see your longest range but what about your shortest? I just have a problem depending on a bullet not to tumble when the bullet is designed not to tumble. Have you had many shots that felt good but only found a little blood?

Eric, here goes. No short answer. Bullets that tumble are long for caliber. In .30 that's USUALLY 240,250 gr. Sierra HPBT Matches. I shot a few deer with 200 and 220 gr. Sierra HPBT that didn't even acted hit. The first two I walked away disgusted with myself for misses. About 10 minutes later they were dead. Autopsy showed pinpoint holes in the lungs!
My shotest kills have been around 50 yards. Most are 150-200. They all act the same. If the deer doesn't see me it will flinch at the shot and keep on feeding. If it sees me it runs. It takes 15-30 seconds for enough blood loss on a lung shot to kill. The ones that don't see me drop then. The ones that run do so in that time (a tracking job). BUT, these tumbling bullets don't "blow" through deer like high vel. rounds, so there is very little ,if any, blood on the ground. The bleeding is internal and the hide has only a 1/2-3/4" jagged exit that acts like a stopper. So a running deer is a challange of a tracking job.
BUT, there are some new twists. The 220 gr. Sierra RN is long and made unstable by the RN. It works. I've dropped several deer with it. Internal damage is greater and exits are a little larger than the 240s. Remember, the 220 HPBTs don't do this(and that's what a lot of this new factory Whisper ammo is loaded with). Shooters will have some surprises and negative comments.
I see the same damage with the good bullets at 50 to 200+ yds. Speed doesn't kill. Tumling does.
NOW, there's another player. Lehigh Industries of Quakertown, PA makes "fracturing" subsonic bullets. They weigh 185 gr.,have slits on the sides of the nose, allowing the nose to split in 4 parts, thinking this will create more damage. This lighter bullet appatrently tumbles in the tail section after the nose breaks off. Internal damage is a little greater. At close range(less than 100) I'll get 4 exit holes. At longer range, one. The nose stays in the deer. What's very interesting about this bullet is that I'm getting around 85% instant knock downs on NON spinal cord/brain hits. That was unheard of with the Sierras. I don't have an answer, but I'm beginning to like these bullets a lot.
I hope that answers your question. I told you a long answer to a short question. Some of my friends call me Windy!

Thanks for the windy answer. I hope it answered some of the op's questions also. Something like you experienced with the 220's is what worried me. The first deer I shot was with a 223 and the guy I got it from gave me a few hundred rounds of non expanding ammo. Found one drop of blood where the deer crossed a ditch and found the deer about a week and 400 yards later thanks to the buzzards. I was just a kid and didn't know better. Sounds like they react much like a bow shot deer with the right bullet and possibly better with the lehigh. Have you made any high shoulder shots with the subsonic loads.

If you get the high shoulder shot perfect, i.e., just touch the top of the shoulder blade and also get the bottom of the spine the deer drops. That's my #1 shot with regular rounds. Works the same with the Whispers. What surprised me were the instant drops with the Lehighs on mid, low, and behind the shoulder shots. I guess the multiple projectiles have something to do with it. One other interesting note: the supersonic .30 cal. Lehighs did poorly after 200 yards. When you're talking bullets and live game nothing works the same everytime. 220 RNs work good for me. 220 HPBTs suck.