How do I tell if my loads are too much or not enough? I was reading that not enough powder can cause over pressures... Im developing a load for my Arisaka, Previous loads I made show that 40 grs of RL-15 were starting to bulge cases, So I made some with 36 grs. My first batch worked great, but the second batch I made with 36 grs. started to bulge cases.. (I used a 150 gr. bullet on both) Doing some online reading Ive read that the 7.7 should be able to take between 35 and 45 grs. of RL-15... Guns & Ammo Magazine had load data for the 7.7 Arisaka between 40 and 45 grs. using a 174 gr. bullet. Im not even close to the maximums so why are my cases bulging? The last batch that didnt work, the cases were already fire formed and I just neck sized them.... Am I loading too light? The 7.7 case doesnt allow for a double charge, and I check all my cases anyways for double charges, so I dont think that was the culprit. Ive read that you can use heaver data on lighter bullets, but not the other way around. Can I use the data for the 174 gr. on the 150 gr.? Thanks for any help!!