I researched comments online (for what they are worth) and decided that unless a MRR comes my way very cheaply that I would try the weight (the price is right). I used buckshot in the std stockbolt hole (unlike yours which will be more trouble regardless). The way it threw the balance and handling off and didnt reduce felt recoil enough for me, though it may for you, meant I didnt continue use.
What is working is another 'slip-over' recoil pad on my recoil pad equiped stock. For me, the extra 1"ish length of pull is not objectionable and easy enough to try. If you like it ,but its too long, you can shorten the stock as a last resort.
The other way to reduce recoil in a meaningful way is to use reduced weight projectiles and/or reduced velocity loads. They are available and the physics of E+MC sq./equal & opposite reaction will again prove true.