couple of sighting in and cleaning questions

[Selmer]

I have finally got my .454 Casull shooting the way I want it to now, 50yds, -MOA.  I decided I wanted to sight it dead on at 100 yds, it will be my deer gun this fall.  I had it dead on at 25, and 2 high at 50, so I figured it had to be close to on at 100 yds, it's a 300 gr. cast moving out at about 1500 fps from my 12" barrel.  I shot it at 100 yds, and it would be dead on, if it weren't 6" high! (still around a 1" group though  )  Why am I shooting so darned high?  I didn't have time to sight it dead on at 100 and then check it at 50 and 25, but can anyone give me an explanation, I'm confused.  I want it to be a 150 yd. gun form a rest, I was taking out 1 qt. oil bottles at 100 yds. from my bipod once I knew where it was shooting.  It's not that I'll have a problem sighting it in, it's just that the trajectory pattern seems a little funny to me.
Second question, how do I get the darn leading out of my barrel?  I'm shooting 300 gr. cast gas checked bullets, and it takes me about a half hour of trading between the brush and the the patches soaked with Butch's Bore Shine.  JB finishes it very well, but doesn't take it out initially for me.  Accuracy is not deteriorating with this leading, I just like to have clean guns and they get cleaned after each session, throw me any tips if you have them.
On another happy note, I have inherited my great-grandfather's 22 target rifle, one of only 13,000 originals built on a Stevens 44 1/2 frame, it's in 90=95% condition, as is the antique Lyman 4x external target scope with original mounts.
Thanks for your help, I appreciate it.

[Duffy]

A quick way to "get the lead out" is to take a old 38 caliber bore brush and wrap it with a copper chore boy/girl so it fits snug in your bbl. If you arent familiar with a chore boy its those copper scrubbers for pots and pans. DON'T USE THE STAINLESS ONES! Take out the staple that holds it together and unwrap it. Then wrap it around the bore brush so it is fatter in the middle than the ends. It should be a snug fit. Cut off the excess with a scissors and clean away. Usually it only takes 5-10 strokes to get the lead out and you can actually feel it scraping it out. Then just follow up with a regular brush and patch. Are you using a scope or open sights? That seems like alot of rise, I just ran a Ext ballistic on my 320 LFN and when it's zeroed at 100 it's only .55 high at 25 but that doesn't even look right. (have to check parameters) Is it climbing up on you quite a bit from recoil? I'll do some more checking.
Ryan

[Selmer]

Duffy, the rise seems funny to me also, thats why I asked the question, and I've run it through realguns.com ballistic calculator and it doesn't compute.  I'm using a 4x Leupold EER scope.  This is my first experience with a true handgun cartridge, I have experience with a 7BR in an xp-100, but that behaved like a rifle.  I agree with you and think it has to be the recoil, but it must be very consistent because I don't get vertical stringing, and it's not that heavy of recoil, I've loaded and shot some heavy H110 loads and it doesn't even compare to those.  I've heard about the Choreboy thing, but I didn't realize I had to wrap it tight around a brush, I'll try that trick next, thanks Duffy.
Sincerely,
Selmer