One coat of primer, two coats of undercoat and a final coat of dulux gloss in magnolia, or perhaps you would rather creosote it.
Obviously work in progress, what will the final shape be like and do you intend to fit a recoil pad or but plate.
It's the calibre of the shooter that counts not the calibre of the rifle.
Well I suppose to anyone but you you have taken a rifle worth several hundred and turned it into one worth about £75 maybe.
I have seen raised combs fitted and done well that the enhance a rifle. I cannot in all honesty say that's what you have done.
The Rifle was bought for keeps, At 275 then I sold scope and mounts for 100 so the gun owes me 175. It shoots straight and it is only my work gun. Each time it saves a lamb its money well spent. My problem was with it was the European drop style stock made for open sights. It took over 2 inches of pipe foam and tape to raise the comb enough for me to mount the gun so I could see down the scope.
The original varnish was 2 pack epoxy, this took over a week to remove with a verity of different products and a lot of scraping. At this time I new the stock would need painting as some of the wood had been damaged with the vanish remover.
The comb has been raised and I have added some length, I cut off anything I did not need. I still need to shape the stock and fit a butt plate. It was a bit trial and error I have already finished the front of the stock to a shape that I thought look good, But the biggest problem was the amount it had to be cut back to allow the bolt to be removed.
Tool used so far hand saw, rasp, sand paper, glue.
Any advances on some thing to paint it with?
If it was mine i would first of all stain it to try to blend the different woods together and then oil finish or for quick result paint it with any exterior grade varnish.
Of course the easiest answer would have been to fit a scope with proper height mounts and probably stick with a reasonable objective like 42/44mm. That would have made this all unnecessary. Instead there is a scope to rival hubble and pylon height mounts = problems.
I would also suggest looking closely at your mounting technique as most with those sort of problems are really scrunching down onto the comb which is not necessary. Try shooting with the neck in a natural position and bring the rifle up to the shoulder rather than cramming down on the stock. Not only is it more comfortable but it also allows better breathing due to the neck being in a normal natural relaxed position.
As for paint well use what you want as it cannot make it much worse really can it?
There have been some pretty disgusting replies to the OP, with the last one from Brithunter being, in my opinion downright rude!
The rifle belongs to the OP and he can do with it as he wants, he asked for advice and the good old SD regulars come in leaping once again on the "lets have a go at someone" bandwagon. Fortunately there were some sensible replies. Whatever you may think of some of the "advice" you were given, carry on, as long as you're happy thats all that matters.