Well I just checked the Oregon regs. It doesnt say its illegal...... but wow. Your range is almost nonexistant witha slug in a 20ga. It would make a 30-30 look like an edge or an ax in comparison.
I definately would not recomend it. However, under the right circumstances, and very limmited range, I dont see why it wouldnt work.
One note tho;
When comparing tools for harvesting game you have to compare like tools. Archery equipment is designed to kill by causing severe hemoraging, while rifles/handguns/shot gun slugs etc. are designed to kill with energy and disruption of the vital organs and functions.
Two completely different but effective tools.
"Its not Rocket Surgery.....'
GOD,GUNS,&GUTTS MADE AMERICA, LETS KEEP ALL 3!winmag
"I have No idea why that cop made me ride in the back seat, when I Clearly called Shotgun!"
I would buy a Stevens 30-06 and use that if I were you.
Had a customer bring in a 410 last year, his kid was going to sit over a bear bait at 15 yards. Wanted the barrel ported so he could have his 12 year old shoot a bear with a slug.
Well one shoulder shot rolled the bear and off he ran to parts unknown. Put the dogs on the track in the morning 3 miles later crossed a river and the track was lost. I've seen whittails puched with 12 gauges in the shoulders, go a very long way. Way further than I would want to see an elk run. I would only go for a rib cage shot thru the lungs, only reliable way to get a thru and thru.
The only reason I could think to do this, is you don't have a rifle or a muzzleloader.
Inexpensive - but completely usable - new rifles are available for prices almost unheard of previously (Marlin XL7, Weatherby Vanguard, etc). Mate them to a very usable scope (Pentax 3-9x40 demos from cameralandny for example) and I have no idea why you'd use a 20 gauge unless you really want a challenge.
Find the best slug you can, that's for sure. Check out the new Hornady or similar; you're still limited to about 80 yards, however.
Don't know about your H&R, but the new Savage P220 is a fantastic 20 gauge slug gun. MOA accuracy and I believe the energy levels from a 20 gauge, 265 gr. saboted, copper jacketed bullet are equal to, or exceed the energy of a .50 cal. muzzle loader at the same velocity. I would not be afraid to take an elk at 125-150 yards. Also, I have shot Whitetails thru both shoulders with centerfire rifles and had them run off into the sunset, so it isn't always the caliber of the weapon that dictates dropping an animal in its tracks.
P.S. Shane, try this new 20 gauge 3 1/2" bombshell. You can have H&R rechamber your 20 gauge to handle it. It has as much muzzle energy as a .300 win mag. 2 1/4" high at 100 is 0 at 140, -8" at 200. Not to bad for a 410 grain slug!
The New 3 1/2" Laser - Accurate Sabot Slug. Too New To Chart