I just loaded some 300gr Hornady HP for 45-70 and according to the book I should be around 1900-2kfps. 46gr IMR4198. It dawned on me that I had issues before with front and rear sand bags and the rifle flipping upwards so I'm looking for advice to control it a bit and see what the rifle can do on paper without fliers from muzzle flip. I'm using a Caldwell rock now and cant afford a lead sled nor do I like shooting off them.