I have a couple of boxes of .375, 235 grain Speers I’d like to load up for whitetail deer. Ive tried trail boss and the groups were horrible. Like 12” plus at 50 yards if I remember correctly. I didn’t have any luck with accuracy till they got up to speed with starting loads (2800 FPS plus) with normal powders. Don’t remember the powder I used at the time. Anyways, it got pretty stout for recoil when accuracy started getting acceptable. I have since changed out the Vias muzzle brake (that didn’t help with recoil)to a KDF brake. I haven’t tried it yet since the KDF was installed. The vias quiet brake would recoil about the same, or worse, than when the brake wasn’t braked. Shot a couple of deer with 260 grain accubonds around 20 years ago. Two shots, 2 deer, and a bruised shoulder. Man that gun belts my shoulder!!! I’m not recoil sensitive but that gun punishes shoulders. Would like to use the gun for deer without getting knocked out of my tree stand and get sone use out of a gun that just sits. Hopefully the KDF is more forgiving. I have a KDF on my 300 RUM. It recoils like a 243 with 125 bullets loaded at 3,950 fps. Any suggestions on powders and downloading my RUM? I did check my action screws today. They were probably hand tightened to 12 inch pounds at max. In sure back in the day they were probably the same torque because I didn’t own the wheeler wrench then and just tightened by hand. I torqued them to 35 inch pounds. I did bed the action and floated the barrel before my test groups but didn’t have the screws torqued properly so that could have had played a part in the horrible groups. I have RL22, rotumbo, h1000, and imr 7828, and trailboss for big bore powders.