Loading for and Shoot the H&R 45/410

[vacek]

I was at a gun show today and sold and old Makarov for $235 and picked up a new in the box H&R 45/410 Survival Model SB1 for a total cost with tax of $229.  This is easily the ugliest gun I have ever owned but should prove useful as a truck gun.  So I have a few questions.
 
1.  This has a screw out choke for firing 45 Colt.  With the choke out, can one still fire 410 with any decent <20 yard pattern?
2.  I am planning on using my own reloads and cast bullets anywhere from 220 - 320 grains.  Will that be a problem if my loads are within less than the max on Ruger Blackhawk 445 loads?
3.  Since we are talking about a longer barrel than my 45 BlackHawk, should I use a slower powder?  Right now my loads are W231 and Red Dot, but I have a lot of powders in my inventory.
4.  I have a spare 20 guage barrel that fits really nice.  Any problem using that with this system?
5.  The gun only comes with a front bead. Should one put a nice large aperature on the barrel?
6.  Anyone else own one of these and what is your experience?
 
Thank you ahead of time for any feedback.
 
Vacek

[cutshurt]

I am working on loads for mine also, so I wont be much help there .... but you will not have a problem with useing the 20 gage barrle on your frame. I have a 20 gage barrel also, as long as it fits and locks up.
 
 Darrel

[spinafish]

Your 45 LC loads should work just fine.  You will probably get okay patterns..minute of snakes head at 10-15 yards...but I believe for any longer shots I would utilize the tube.