You may not want to hear this but I also agree with focusing on quality rather than quantity , and if excellent technique is a goal then using a lighter caliber so you still have similar mechanics up until the recoil impulse. Joint injury and inflammation does not come and go for free. Scar tissue is deposited, joints enlarge but weaken. All adults have some degree if arthritis already but when it starts hurting the focus is how well we can put up with the pain. Young athletes who have had joint trauma may start having arthritis early on.