Home Forums Hunting & Shooting Long Range Hunting .284win or 7mm saum or 280ai for lightweight long action hunter

Due to a messed up shoulder, "As good as it's going to get" I hardly ever shoot the 300wms these days and may in fact convert one of them to whatever round I choose, I want a flatter trajectory with more distance than the 7mm-08 can give me with heavier bullets and without the magnum recoil so I will be able to shoot from field positions. I can shoot the 300wms all day from the leadsled but that's not alot of fun. I do want to keep the gun fairly light though as it will be a hunting gun involving lotsa walking,,,, thinking elk, mule deer, possible caribou/moose. 24 inch sporter barrel,

Would the 280ai be hindered by shooting longer bullets IE loosing powder capacity compared to a shorter round in a long action with the bullet set out to not hinder powder capacity.?

Thanks for all the input so far,,,